Heat rays

Japanese: heat rays(英語表記)heatrays
Heat rays

…Infrared rays are electromagnetic waves characterized by their thermal action. When a material absorbs near-infrared rays, the thermal motion within the material is excited, causing the material to rise in temperature. For this reason, this part is sometimes called heat rays.
[Infrared spectrum]
The spectra of molecular vibrations and lattice vibrations of crystals appear in the near-infrared to mid-infrared range, while the rotational spectra of light molecules appear in the far-infrared range.

*Some of the terminology that mentions "heat rays" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…赤外線はその熱作用で特徴づけられる電磁波であり,物質が広義の近赤外線を吸収すると物質内の熱運動が励起されて温度が上昇する。このため,この部分を熱線heat raysと呼ぶこともある。
[赤外スペクトル]
 分子振動や結晶の格子振動のスペクトルは近赤外から中間赤外領域に,軽い分子の回転スペクトルは遠赤外領域に現れる。…

※「heat rays」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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