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Here $H$ is a self-adjoint operator in Hilbert space $\\LR\\otimes \\fff\\cong \\int^\\oplus_{\\RR^d}\\fff {\\rm d}x$, and $A=\\int^\\oplus_{\\RR^d} A(x) {\\rm d}x$ a quantized radiation field and $\\hf$ the free field Hamiltonian defined by the second quantization of a dispersion relation $\\omega:\\RR^d\\to \\RR$. It is emphasized that massless case, $M=0$, is included. 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