Natural release

Japanese: 自然放出 - しぜんほうしゅつ

Also known as spontaneous emission. A phenomenon in which atoms, molecules, etc., in an excited state naturally emit light (electromagnetic waves) without the aid of any external action, and move to another steady state with lower energy. The majority of light emission phenomena from substances are due to spontaneous emission, and because light emission occurs independently and randomly in each particle, the synthesized emitted light is light with a distorted phase. In addition, the average time that atoms or molecules remain in an excited state is called their lifetime, and because the lifetime is proportional to the cube of the wavelength of the electromagnetic waves emitted, spontaneous emission becomes more likely to occur suddenly when the wavelength becomes shorter. → Stimulated emission

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

自発放出とも。原子や分子などが励起状態にあるとき，外部からの作用によらず自然に光（電磁波）を放出してエネルギーの低い他の定常状態に移る現象。物質からの発光現象の大部分は自然放出によるもので，発光が個々粒子で独立に乱雑に起こるため，合成された放出光は位相の乱れた光となる。また，原子や分子が励起状態にとどまる時間の平均時間を寿命というが，寿命は放出される電磁波の波長の３乗に比例するため，短波長になると，急激に自然放出が起こりやすくなる。→誘導放出

出典　株式会社平凡社百科事典マイペディアについて　情報

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