| 单词 | internal conversion |
| 释义 | > as lemmasinternal conversion internal conversion n. (a) Physics the conversion of energy from one form to another within a particular system; esp. (in later use) a process in which the energy of a gamma-ray photon emitted by a decaying nucleus is given up to an orbital electron, causing the electron to be emitted from the atom; (b) Physical Chemistry the radiationless transition of a molecule or atom from one state to another of lower energy but the same multiplicity; cf. intersystem crossing at intersystem adj. ΘΚΠ the world > matter > physics > atomic physics > ion > ionization > [noun] > ionization produced by electromagnetic radiation > process or condition photoelectric effect1892 photoeffect1903 internal conversion1905 photoelectric absorption1921 photo-detachment1943 photoejection1964 the world > matter > physics > quantum theory > electron spin > multiplet > [noun] > number of components in > transfer maintaining internal conversion1905 1905 R. H. Smith Commerc. Econ. Steam & other Thermal Power-plants v. 170 ‘Damping’, which means the internal conversion of mechanical kinetic energy into other forms of energy. 1924 Proc. Royal Soc. A. 105 186 We find the number of β-ray line electrons to be extremely high, so that believing them to be all due to internal conversion of the γ-ray, we deduce that this internal absorption coefficient has a very high value. 1972 H. A. Enge et al. Introd. Atomic Physics xii. 386 Internal conversion competes with gamma emission, and the ratio of the probabilities of the two processes depends strongly upon the multipolarity. 1972 C. H. J. Wells Introd. Molecular Photochem. iii. 34 Internal conversion (ic) is the term given to the radiationless process whereby a molecule transfers from one electronic state to another electronic state of the same multiplicity. 2006 E. V. Anslyn & D. A. Dougherty Mod. Physical Org. Chem. xvi. 993 Multiple photophysical events can occur from these excited state surfaces—namely, internal conversion, fluorescence, intersystem crossing, and phosphorescence. < as lemmas |
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