A formula which is convenient for the calculation of piezoabsorption spectrum is derived. By applying the formula to the π-bands of graphite, the piezoabsorption near 4.8 eV peak is calculated numerically, and some corrections of the previous result for the absorption are also made. The results are compared with those of thermoreflectance measurement; discrepancies between the theory and the experiment are discussed in connection with the choice band model.
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Imatake et al. (1970) studied this question.
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