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In an ideal perfect solid, the phonon propagated by an unattenuated plane wave¡£ that is to say£¬ the phonon correlation length is not restricted,  the performance registers as momentum conservation in the Raman scattering, and the phonon can be excited only in the Brillouin zone center¡£At room temperature£¬the first-order Raman peak of  monocrystalline silicon is at 525cm-1,which its half-width is 2.25cm-1, and its second-order one is near 970cm-1

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