| 单词 | population inversion |
| 释义 | > as lemmaspopulation inversion population inversion n. Physics a transposition of the relative numbers of atoms or molecules occupying certain energy levels (normally with more particles in a higher state than in a lower one, as in a laser). ΘΚΠ the world > matter > physics > atomic physics > [noun] > particles occupying energy state > transposition of number of optical pumping1952 population inversion1961 inversion1963 1961 Physical Rev. Lett. 6 106/1 Population inversions are achieved between several Ne levels by means of excitation transfer. 1995 Sci. Amer. Feb. 52 Masers and lasers arise from a condition known as population inversion, in which the number of atoms or molecules in a higher-energy state exceeds that in a lower-energy state—the reverse of the normal state of affairs. < as lemmas |
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