自し然ぜん放ほう出しゅつ

noun

spontaneous emission

Technical term in physics for the process by which an atom or molecule transitions from an excited state to a lower energy state and emits a photon without external stimulation.

• レーザーと自し然ぜん放ほう出しゅつの違ちがいを説せつ明めいしてください。

  Please explain the difference between a laser and spontaneous emission.