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本文应用格林函数方法讨论了晶体点阵的色散的二级电矩效应,并且也考虑了非简谐势的效果。结果表明,在不考虑非简谐势时,与博恩和黄昆应用其他方法所得到的结果一致;而非简谐势的效果将调变吸收分布的强度。A theory is given for the effect of the second order electric moment of crystal on dispersion by means of the Green's function method, in which account is taken of the an-harmonic potential. When we ignore the effect of the anharmonic potential, the result obtained is reduced to that of M. Born and Huang Kun; the effect of the unharmonic potential is to modify the distribution of the strength of absorption.
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