“Einstein's coefficient of spontaneous emission”的概念、定义、翻译、参考文献-科学参考

单词	Einstein's coefficient of spontaneous emission
释义	Einstein's coefficient of spontaneous emission [¦īn´stīnz ´kō·ǝ¦fish·ǝnt ǝv spän¦tā·nē·ǝs ǝ`mish·ǝn] ^{ATOMIC PHYSICS} Proportionality constant governing the rate at which atoms or molecules pass spontaneously from an upper energy state to a lower one by emission of radiation, equal to the number of such transitions per second divided by the number of atoms in the upper state.
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