…The optical mode has a frequency of approximately 10 13 Hz and contributes to infrared light absorption and Raman scattering. In contrast, the mode in which positive and negative ions vibrate in the same direction and with the same magnitude is called the acoustic mode. This name comes from the fact that this mode is related to waves with low frequencies, similar to sound waves. … *Some of the terminology explanations that mention "acoustic mode" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…光学モードの振動数は,ほぼ1013Hzで,赤外光の吸収,ラマン散乱に寄与する。これに対して,正,負のイオンが同じ向きに,同じ大きさで振動するモードは音響モードacoustic modeと呼ばれる。音波程度の低い振動数の波に関係するモードであることからこの名前がついている。… ※「acoustic mode」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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