| 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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