Theoretical interpretation of the optical activity of quartz

Large Local-Field Corrections in Optical Rotatory Power of Quartz and Selenium

“…Figure 1 shows the calculated and experimental results [4] for the rotatory power of a-quartz. The data are plotted as r͑͞hv͒ 2 as a function of ͑hv͒ 2 , which in accordance with the coupled-oscillator model [15] gives a slow variation with v. The dip at the lowest experimental frequency is probably due to an additional screening by phonons [16], which we do not include. The theoretical curve with no local-field corrections is due to Zhong et al, while the arrow marks our zero-frequency value 5.6 deg͓͞mm ͑eV͒ 2 ͔ (with D 1.8 eV).…”