{"id":"17b2b58b-1feb-4d9f-9073-8284de4ebb3f","arxiv_id":"2412.01458","paper_version":1,"verdict":"CONDITIONAL","confidence":"MODERATE","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","parameter_count":6,"one_line_summary":"A delayed photoelectron band peaking at 1.2 ps is assigned to the collapse of a metastable, foam-like Mg_n aggregate in helium nanodroplets, giving a cluster formation time of about 450 fs.","lead":"Researchers used ultrafast laser pulses and helium nanodroplets to watch magnesium atoms assemble into a cluster, seeing a delayed electron signal that peaks 1.2 picoseconds after excitation. The result traces how absorbed light energy flows into bond formation, highly excited atomic states, and ejection of cluster fragments.","discovery_kind":"new_application","skeptic_critique":{"model":"deepseek-v4-flash","headline":"The foam premise is load-bearing and unverified: the 1.2-ps delayed band is interpreted as collapse of a 9.5-Å Mg 'foam' whose only positive prediction (DFT, Ref 34) is contradicted by PIMC (Ref 37), and no observable here measures Mg–Mg distance; neither theory leg covers the actual aggregate…","rationale":"The reader's weakest assumption — existence of the foam-like precursor — is the same premise I would flag first, so my agreement is with the reader. I add three refinements and one independent, checkable problem. Refinements: the paper's observables (global-fit rise time, covariance, doping dependence) are kinetic and correlational; none constrains the 9.5-Å geometry, so the interpretation is underdetermined and partly circular; both theory legs (n = 2–3) miss the experimental size (up to Mg16 per Appendix VII A), so a PIMC study for n = 4–16 is the decisive missing calculation; and the supporting experimental lineage (Refs 22, 31, 33) is from the same groups, leaving no independent confirmation of foam at these sizes. Independent problem: Appendix VII C's absorption cross-section appears overestimated by a factor of 4π² ≈ 39. The authors use σ0 = (1/4)(g2/g1)λ²A21 paired with an angular-frequency overlap integral; Hilborn's relation (their Ref 89) gives ∫σ(ν)dν = (g2/g1)λ²A21/(8π), i.e., ∫σ(ω)dω = (g2/g1)λ²A21/(16π²). Their σ_abs ≈ 2200 Mb exceeds the lifetime-limited on-resonance maximum (g2/g1)λ²/(2π) ≈ 381 Mb for their own A21 = 4.91×10^8 s⁻¹ and λ = 282.5 nm, which is physically impossible; the corrected σ_abs ≈ 56 Mb lowers p1 from 0.81 ± 0.15 to roughly 0.05–0.15, so the two-excited-atom requirement for the proposed energy-pooling mechanism is unlikely for small aggregates (P(≥2) ≈ 3% for a three-atom foam at p1 = 0.1) and the statement that 'excitation of at least two Mg atoms is therefore quite likely' (Discussion) loses its support. I would not reject: the delayed band is independently corroborated by the covariance channel (matching N2 spectrally and temporally), the doping dependence supports two distinct species, fit residuals are documented, and the paper is transparent about the PIMC dispute. The verdict stays CONDITIONAL: verify the foam structurally or via larger-n PIMC, and correct the Appendix VII C calculation, before full acceptance.","tokens_in":20577,"tokens_out":51375,"duration_ms":420927,"concrete_test":"Ultrafast electron diffraction of Mg_n-doped He_N (the technique demonstrated for Xe 'foam' clusters in Ref 71), recording the Mg–Mg pair-distance distribution at pump–probe delays from −1 to +5 ps following the 282-nm pump. If a distinct feature near 9.5 Å is present before the pump and collapses with ~450 fs, the foam premise and the assigned cluster-formation time constant are directly confirmed. If only compact ~3–4 Å Mg–Mg contacts appear at all delays, the delayed band cannot be a foam collapse and the central claim fails. A cheaper, immediately executable first step: path-integral Monte Carlo for n = 4–16 Mg atoms in He_N at 0.37 K, since the existing PIMC (Ref 37) covers only n = 2–3 and cannot rule the experimental regime in or out.","verdict_should_be":"UNCHANGED","load_bearing_attack":"Headline interpretation requires the disputed foam. The delayed photoelectron band peaking at 1.2 ps (N2/DAS2; τ_rise2 = 450±180 fs) is claimed to be the photoinduced collapse of Mg_n aggregates from a metastable, foam-like configuration with 9.5-Å Mg–Mg spacing to a compact cluster. This is the paper's stated 'crucial prerequisite' (Conclusions), but the only positive prediction is a static DFT calculation for two Mg atoms in He_N (Ref 34), which the authors themselves note is contradicted by path-integral Monte Carlo simulations (Ref 37) finding no metastable stabilization for two or three Mg atoms. Three features sharpen the concern: (1) no observable in this paper measures Mg–Mg distance — the delayed rise, the covariance of band (2) with Mg_n^+ ejection, and the doping dependence (Fig. 6) are all consistent with the foam model but do not establish any interatomic separation; using the time-domain response as evidence for the foam's photodynamics is partly circular, since the delayed band was assigned to the foam in the first place. (2) The experimental aggregates are estimated up to Mg16 (Appendix VII A), whereas both theory legs (Ref 34, two Mg atoms; Ref 37, two–three) cover only small n; the foam premise is an extrapolation neither simulation addresses. (3) If the foam does not exist, the delayed band requires a different mechanism and the stated 450-fs cluster-formation time constant loses its assigned physical meaning.","agreement_with_reader":"agree"},"referee_report":{"model":"deepseek-v4-flash","summary":"The paper reports time-resolved photoelectron and photoion measurements on Mg_n aggregates formed in helium nanodroplets, using a 282 nm pump and 404 nm probe. The transient photoelectron spectra show a prompt band attributed to compact van der Waals clusters and a delayed band peaking at about 1.2 ps. A global fitting analysis yields decay-associated spectra and time constants, including a rise time of (450±180) fs for the delayed population, which the authors interpret as the photoinduced collapse of a metastable, foam-like Mg_n configuration (predicted to have 9.5 Å Mg–Mg spacing) into a compact cluster. Electron–ion covariance measurements indicate that only the delayed process leads to ejection of Mg_n^+ fragments from the droplet. The paper further proposes an energy-pooling reaction between excited Mg atoms during cluster formation to explain the population of highly excited atomic states, and discusses conversion of electronic energy into nuclear kinetic energy as the origin of fragmentation.","tokens_in":20964,"tokens_out":7593,"duration_ms":70420,"significance":"If the interpretation is correct, the experiments constitute a real-time observation of multi-atom bond formation in a quantum solvent, together with a photon upconversion pathway that is relevant for photoinduced chemistry. The experimental work is careful: the data are internally consistent, the global fit is documented with residuals below 10% (Fig. 8), parameter uncertainties are reported (Table I), and the covariance analysis is a strong tool for linking photoelectron bands to ionic products. The paper also explicitly acknowledges the contradictory theoretical predictions for the foam configuration. However, the central claim rests on a disputed theoretical premise that is not independently verified by any observable measured here. The significance is therefore conditional: the methodology and observations are valuable, but the headline interpretation—that a foam-like configuration collapses to a compact cluster on a 450 fs timescale—is not yet established to the strength implied by the abstract and conclusions.","major_comments":[{"comment":"The central claim that the delayed band peaking at 1.2 ps (DAS2/N2) represents the photoinduced transition from a metastable, foam-like Mg_n configuration to a compact cluster rests on a theoretical premise that the manuscript itself reports as contested. Section I notes that path integral Monte Carlo simulations (Ref. 37) find no metastable stabilization for two or three Mg atoms, in contrast to the static DFT prediction (Ref. 34) of a 9.5 Å separation for two atoms. No observable in the present experiment measures the Mg–Mg distance: the delayed rise, the covariance with Mg_n^+ ions (Fig. 4), and the doping dependence (Fig. 6) are all consistent with the foam model but do not establish the initial geometry. Because the abstract and Conclusions present the foam-to-cluster transition as established, the paper currently overstates its result. The authors should either provide independent experimental evidence for the 9.5 Å spacing (e.g., a structure-sensitive probe) or substantially reframe the interpretation as one possible mechanism among others, with the 450±180 fs time constant labeled as model-dependent.","section":"V Conclusions (also Section I)"},{"comment":"The experimental aggregates are estimated to contain up to about 16 Mg atoms (Section VII A), whereas the supporting DFT prediction (Ref. 34) is for two Mg atoms and the contradicting PIMC simulation (Ref. 37) covers two and three atoms. The foam hypothesis is therefore extrapolated to cluster sizes that neither simulation addresses. The doping dependence in Fig. 6 provides only indirect support: the decrease of band (2) at high oven current is attributed to spontaneous collapse during pickup (Ref. 22), but this does not constrain the interatomic separation for the sizes relevant to the time-resolved measurement. The manuscript should state clearly which cluster sizes the foam model is applied to and why the simulations are expected to carry over.","section":"VII A, Fig. 6"},{"comment":"The delayed rise time τ2^rise = 450±180 fs is obtained by fitting the transient spectra with a sequential population-transfer model (Eq. 2), and this rise time is then interpreted as the cluster-formation time. The fit residual being below 10% (Fig. 8) shows that the chosen model reproduces the data, but it does not demonstrate that the model is unique. A delayed photoelectron rise can also arise from other feeding mechanisms, such as relaxation of the He solvation shell, exciplex formation, or cascaded electronic relaxation within a cluster. Because the assignment of DAS2 to foam collapse is made a priori in the interpretation (Section III, 'Interpretation of DAS populations'), the subsequent use of τ2^rise as the foam-collapse time constant is at least partly circular. The authors should compare the data to alternative kinetic models and/or identify an observable that distinguishes the structural collapse from other delayed population-transfer channels.","section":"III, Eq. (2)"},{"comment":"The proposed energy pooling mechanism is presented as the explanation for the population of highly excited states, but the evidence is circumstantial. The identification of the high-binding-energy tail with specific atomic states (e.g., 4^3S, 4^1S, 3^1D) is based on a qualitative overlap in Fig. 4c with unresolved, broadened features; no resolved atomic lines or quantitative state-to-state populations are reported. The estimate p1 = 0.81±0.15 (Appendix VII C) assumes a gas-phase oscillator strength, a Gaussian line shape with FWHM 4 nm, and a particular beam geometry, and the manuscript does not assess how these assumptions affect the probability that at least two Mg atoms in the same droplet are excited. In its current form the energy pooling mechanism is a reasonable hypothesis but is stated too strongly in the abstract and conclusions. The authors should clearly label it as a proposed mechanism and discuss alternative pathways for populating low-binding-energy states.","section":"IV, Energy-pooling reaction, Appendix VII C"}],"minor_comments":[{"comment":"In Section II, 'the the total electron yield' contains a doubled article; change to 'the total electron yield'.","section":"II"},{"comment":"In the caption of Fig. 2 and in several places in the text, 'van der Waals cluster' should be 'van der Waals clusters' for grammatical agreement; please check the manuscript for similar pluralization errors.","section":"III"},{"comment":"The 9.5 Å spacing is a prediction for two Mg atoms (Ref. 34), but the abstract refers to it as the interatomic spacing of the Mg_n aggregate without qualification; please specify explicitly that the prediction is for a dimer and that its extension to larger aggregates is an assumption.","section":"Abstract and Section I"},{"comment":"The estimate that the largest initial cluster size is Mg_16 rests on the assumption that the parent cluster splits in half during pump–probe ionization; this is an assumption rather than a measured quantity and should be flagged as such, with a brief justification or a sensitivity discussion.","section":"VII A"}],"recommendation":"major_revision","confidential_remarks":"The paper has strong experimental content and a clear presentation of the global fitting and covariance methodology. The main risk is that the abstract and conclusions present the contested foam-collapse interpretation as established fact. If the authors choose to reframe the central claim as a hypothesis consistent with the data, discuss alternative mechanisms quantitatively, and soften the wording of the time constant, the paper could become publishable. The referee recommends major revision rather than rejection because the observed delayed band and ion correlation are genuine, reproducible findings that merit publication even if the structural interpretation remains open."},"author_rebuttal":null,"desk_editor":{"model":"deepseek-v4-flash","letter":"First, what you should know: this is a serious experimental paper. It reports a genuinely new observation—a delayed photoelectron band peaking at 1.2 ps in photoexcited Mg_n aggregates in helium nanodroplets—and backs it with two independent outputs: a global fit (residuals under 10%) and electron-ion covariance, which shows the delayed band correlates with Mg_n+ fragments while the prompt band does not. The doping dependence (Fig. 6) also behaves as you'd expect if the two species are distinct. The analysis is careful and honest.\n\nThe soft spot is the interpretation, not the data. The delayed band is attributed to the collapse of a metastable \"foam\" of Mg atoms at 9.5 Å spacing, a configuration that comes from a static DFT calculation (Ref. 34) that is directly contradicted by PIMC (Ref. 37). The paper acknowledges this contradiction in the Conclusions, but does not resolve it. No observable here measures Mg–Mg distance, so the 450 fs rise time is assigned to nuclear collapse only if the foam exists. The energy-pooling mechanism is plausible—they see population above the pump photon energy and the single-atom excitation probability makes multiple excitations likely—but it is proposed, not demonstrated. Also, the aggregate size is estimated up to Mg16 while both theory legs cover only two to three atoms.\n\nNone of this kills the paper's value. The delayed band and its ion correlation are new and will need explaining whatever the ultimate mechanism is. If the foam doesn't exist, the 1.2 ps band needs an alternative interpretation, and the paper's central claim would need substantial revision. That's exactly why this deserves peer review: the experimental contribution is solid, the interpretation is testable, and the authors are upfront about the weak premise. The right referee will push for a more cautious framing and for structural evidence (or at least a path to it) before the foam interpretation is accepted as fact.\n\nWho it's for: anyone working on helium droplet dynamics, time-resolved photoelectron spectroscopy, or cluster formation. I'd cite the data even if I'm not yet sold on the foam. I'd bring it to reading group, but late in the semester.\n\nSerious thinker: yes.\n\nRecommendation: send to a serious journal; it warrants a full review, and with revision on the interpretation, it could be a strong paper.","headline":"Solid, carefully analyzed femtosecond data that reports a real delayed band in Mg_n/He_N, but its star claim—that the delay is the collapse of the disputed foam—rests on a premise the paper itself cannot defend.","tokens_in":21486,"tokens_out":2515,"would_cite":true,"duration_ms":22088,"reading_group":"maybe","serious_thinker":"yes","would_accept_peer_review":true},"rs_alignment":null,"lean_confirmation":null,"pith_extraction":{"msc":[],"pacs":[],"model":"deepseek-v4-flash","headline":"Femtosecond pump–probe spectroscopy on magnesium aggregates in helium nanodroplets reveals a delayed photoelectron band peaking at 1.2 ps that the authors attribute to the collapse of a metastable, foam-like Mg_n configuration into a…","keywords":["helium nanodroplets","femtosecond time-resolved photoelectron spectroscopy","magnesium clusters","cluster formation dynamics","energy pooling","metastable configurations","global fitting analysis","photoion–photoelectron covariance"],"falsifier":"A decisive test would be to measure the delayed photoelectron band under conditions where the foam is known to be absent—for example, at high Mg doping where the aggregate has already collapsed, or with droplets of different sizes—and to show that it vanishes; alternatively, a direct structural measurement (femtosecond electron diffraction or a second pump–probe scheme with a longer delay) that resolves the Mg–Mg distance during the first picosecond and finds no contraction from ~9.5 Å to a bond length would falsify the nuclear-motion assignment.","tokens_in":20386,"feed_emoji":"⚛️","tokens_out":8799,"duration_ms":68732,"temperature":0.7,"pith_summary":"The paper reports a real-time observation of multi-atom cluster formation, a process that has been largely inaccessible to time-domain experiments. By loading superfluid helium nanodroplets with about ten magnesium atoms and exciting them with a femtosecond pump pulse, the authors identify a photoelectron band that rises with a time constant of (450±180) fs and peaks at 1.2 ps. They interpret this delayed band as the signature of nuclear dynamics: the collapse of a metastable, foam-like arrangement of Mg atoms, with a predicted interatomic spacing of 9.5 Å, into a compact van der Waals cluster. The same transient shows that the collapse populates highly excited magnesium states, up to 3 eV above the initial excitation, which the authors attribute to an energy pooling reaction between excited atoms. If correct, this establishes helium nanodroplets as a platform for watching bond formation in larger aggregates and for studying photon energy upconversion on a femtosecond timescale.","feed_headline":"Femtosecond clock captures Mg cluster formation at 450 fs","feed_subtitle":"Delayed photoelectron band reveals collapse of a metastable Mg foam and energy pooling in helium nanodroplets.","key_machinery":"The key machinery is the combination of femtosecond pump–probe photoelectron spectroscopy with a global fitting analysis that decomposes the time-resolved spectrum into decay-associated spectra, each with its own transient population function. The delayed band is modeled by a sequential population transfer, $N_i(t) \\propto [N_A(t, \\tau_A) - N_B(t, \\tau_B)] \\tau_A/[2(\\tau_A-\\tau_B)]$, in which an initially excited state (the $3\\,^1P_1$ Mg state, which is not directly detected in the one-photon probe window) feeds the observed state with rise time $\\tau_A$ and the observed state decays with $\\tau_B$. Photoion–photoelectron covariance detection provides the link between the delayed photoelectron band and the nuclear products: only the forming-cluster pathway yields Mg$_n^+$ ions ejected from the droplet. The proposed energy pooling reaction, $\\mathrm{Mg}(3\\,^1P_1) + \\mathrm{Mg}(3\\,^1S_0) + \\mathrm{He} \\to \\mathrm{Mg}_2^*(^1\\Sigma_u^+, ^1\\Pi_g) + \\mathrm{He}$ followed by $\\mathrm{Mg}_2^* + \\mathrm{Mg}(3\\,^1P_1) \\to \\mathrm{Mg}(4\\,^3S, 4\\,^1S, 3\\,^1D, ...) + 2\\,\\mathrm{Mg}(3\\,^1S_0)$, is the mechanism by which the collapse populates states above the excitation energy.","core_discovery":"The central claim is that femtosecond time-resolved photoelectron spectroscopy of Mg_n aggregates inside helium nanodroplets reveals a delayed photoelectron band peaking at 1.2 ps whose rise time, $\tau_{\\text{rise}} = (450 \\pm 180)$ fs, is the time scale on which a metastable 'foam-like' Mg_n configuration converts into a compact cluster. This assignment separates the response into two species: a prompt band ($\\tau = 380 \\pm 70$ fs) from pre-formed compact clusters, and a delayed band (rise $450 \\pm 180$ fs, decay $4.0 \\pm 0.9$ ps) from the forming clusters. The delayed band is correlated with ejection of Mg_n^+ ions from the droplet, linking the electronic signal to nuclear fragmentation. The paper further claims that the collapse populates Mg states with binding energies below the 3.07 eV probe window, including states up to about 3 eV above the initially excited $3\\,^1P_1$ state, and proposes an energy pooling mechanism: association of an excited and a ground-state Mg atom into Mg$_2^*$, followed by collision with a second excited Mg atom to yield Mg($4\\,^3S$, $4\\,^1S$, $3\\,^1D$, ...).","pith_inferences":["The same pump–probe strategy could be extended to other dopants for which metastable separations have been predicted (rare gases, halogens, molecules), potentially turning helium nanodroplets into a general testbed for solvent-mediated bond formation.","The interpretation implies a testable scaling: if the 450 fs rise is truly nuclear contraction, it should depend on the initial Mg–Mg distance and on the helium solvation shell, and it should change when the droplet size or doping level is varied; a purely electronic origin would show no such dependence.","The energy pooling rate could be probed directly by varying the number of excited atoms per droplet (e.g., by attenuating the pump pulse) and checking whether the delayed band amplitude scales quadratically with excitation probability, as expected for a two-excited-atom collision.","The contradiction between the DFT prediction of a stable foam and the path-integral Monte Carlo results could be addressed by a time-resolved structural probe, such as femtosecond electron diffraction of the doped droplets, which would directly measure the Mg–Mg distance evolution during the first picosecond."],"forward_implications":["If the assignment holds, cluster formation in helium nanodroplets can be clocked directly, giving a contraction time of $(450 \\pm 180)$ fs for Mg_n aggregates starting from a dilute metastable configuration.","The energy pooling pathway implies that a fraction of the absorbed photon energy is re-emitted as electronic excitation of individual atoms up to 3 eV above the pump photon energy, a form of photon upconversion that occurs within the first picosecond of cluster collapse.","The covariance between the delayed photoelectron band and ion ejection establishes that electronic relaxation to kinetic energy, not simply ionization, is what liberates ionic fragments from the helium droplet.","The distinction between a prompt band (compact clusters) and a delayed band (forming clusters) provides a time-domain fingerprint that frequency-domain spectroscopy cannot resolve, even where absorption spectra of different cluster sizes overlap."],"supporting_citations":[{"why":"Predicts the metastable 9.5 Å Mg–Mg separation in helium, the initial configuration the interpretation requires.","marker":"[34]"},{"why":"Path-integral Monte Carlo simulation that finds no metastable Mg2 stabilization, the main counter-evidence.","marker":"[37]"},{"why":"Reported light-induced collapse of metastable Mg complexes in He droplets and the 282.5 nm absorption used as the pump transition.","marker":"[33]"},{"why":"Earlier time-resolved study of the collapse of magnesium atom foam; supplies the comparable ~350 fs contraction time.","marker":"[31]"},{"why":"Shows spontaneous collapse of Mg foam at high doping and provides ionization potentials of compact clusters, used to assign bands (1) and (2).","marker":"[22]"},{"why":"Global fitting/target analysis method used to separate the overlapping photoelectron bands into decay-associated spectra.","marker":"[47]"},{"why":"Energy pooling in Mg vapor under He buffer gas, providing the basis for the proposed pooling mechanism.","marker":"[58]"}],"fun_headline_variants":["Mg foam collapase timed at 450 fs in helium drops","Helium droplets clock Mg cluster birth at 450 fs","Energy pooling seen in Mg cluster formation","450 fs: Mg atoms go from foam to compact cluster","Cluster formation energy flow tracked in real time"],"cache_read_input_tokens":3200,"weakest_assumption_plain":"The entire interpretation of the delayed band as cluster formation rests on the premise that Mg atoms inside helium nanodroplets can indeed be prepared in a metastable, foam-like configuration with an interatomic spacing of about 9.5 Å, a prediction that the paper itself notes is disputed by simulations finding no such metastable state.","fun_headline_variants_meta":{"raw":{"variants":["Mg foam collapase timed at 450 fs in helium drops","Helium droplets clock Mg cluster birth at 450 fs","Energy pooling seen in Mg cluster formation","450 fs: Mg atoms go from foam to compact cluster","Cluster formation energy flow tracked in real time"]},"model":"deepseek-v4-flash","effort":"low","cost_usd":0.000193,"raw_usage":{"total_tokens":1443,"prompt_tokens":1129,"completion_tokens":314,"prompt_tokens_details":{"cached_tokens":384},"prompt_cache_hit_tokens":384,"prompt_cache_miss_tokens":745,"completion_tokens_details":{"reasoning_tokens":238}},"tokens_in":745,"tokens_out":314,"duration_ms":3646,"temperature":1.0,"reasoning_tokens":238,"cache_read_input_tokens":384,"cache_creation_input_tokens":0},"cache_creation_input_tokens":0},"created_at":"2026-08-12T04:17:54.493289+00:00","model_set":{"reader":"deepseek-v4-flash"},"falsifier":"A decisive test would be to measure the delayed photoelectron band under conditions where the foam is known to be absent—for example, at high Mg doping where the aggregate has already collapsed, or with droplets of different sizes—and to show that it vanishes; alternatively, a direct structural measurement (femtosecond electron diffraction or a second pump–probe scheme with a longer delay) that resolves the Mg–Mg distance during the first picosecond and finds no contraction from ~9.5 Å to a bond length would falsify the nuclear-motion assignment.","supporting_citations":[{"cited_title":"Hernando, M","cited_arxiv_id":null,"evidence_quote":"Predicts the metastable 9.5 Å Mg–Mg separation in helium, the initial configuration the interpretation requires."},{"cited_title":"Krotscheck and R","cited_arxiv_id":null,"evidence_quote":"Path-integral Monte Carlo simulation that finds no metastable Mg2 stabilization, the main counter-evidence."},{"cited_title":"G¨ ode, R","cited_arxiv_id":null,"evidence_quote":"Earlier time-resolved study of the collapse of magnesium atom foam; supplies the comparable ~350 fs contraction time."},{"cited_title":"Kazak, K.-H","cited_arxiv_id":null,"evidence_quote":"Shows spontaneous collapse of Mg foam at high doping and provides ionization potentials of compact clusters, used to assign bands (1) and (2)."},{"cited_title":null,"cited_arxiv_id":null,"evidence_quote":"Global fitting/target analysis method used to separate the overlapping photoelectron bands into decay-associated spectra."},{"cited_title":"Husain and G","cited_arxiv_id":null,"evidence_quote":"Energy pooling in Mg vapor under He buffer gas, providing the basis for the proposed pooling mechanism."}],"review_version":1}