Optical mode

Japanese: optical mode(英語表記)opticalmode
Optical mode

...This is because high-frequency lattice vibrations fall to the lowest energy state at low temperatures due to quantum effects and no longer contribute to the specific heat. When a crystal is composed of positively and negatively charged ions, the vibrations in which the positive and negative ions move in opposite directions are called optical modes. This vibration is named after the fact that it strongly interacts with infrared light due to the electromagnetic field of light. ...

*Some of the terminology that mentions "optical mode" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これは,高い振動数をもつ格子振動が,低温で量子効果のため,いちばん低いエネルギー状態に落ち込んで比熱に寄与しなくなるためである。結晶が,正,負の電荷をもつイオンから構成される場合,正,負のイオンが逆の向きに動く形の振動を光学モードoptical modeと呼ぶ。この振動は,光の電磁場により,赤外光と強く相互作用をするためこの名前がつけられている。…

※「optical 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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