Abstract
Abstract The high-pressure Raman spectra of crystalline methylene halides (CH2Cl2, CH2ClI, CH2Br2, CH2BrI and CH2I2) have been measured to study the resonance phenomena between the vibron and the libron. The pressure-tuning resonances were observed around 4 3 and 2 5 kbar for CH2Br2 and CH2BrI, and their vibron-libron coupling constants were determined to be 10.3 and 4 cm−1, respectively. The same resonance was not observed for CH2ClI; the libron just passes through the vibron mode without mutual interaction. From these results, including more CH2Cl2 and CH2I2, we investigate the dominant factors to determine the possibility of observing pressure-tuning of the vibron-libron resonance and present a systematic explanation of new phenomenon in methylene halides.
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