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- W1845156988 endingPage "296" @default.
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- W1845156988 abstract "This chapter presents the calculation of atomic transition probabilities. Measurements of lifetimes proceed by exciting the atoms of interest either optically or by electron impact and studying the subsequent decay by one of a variety of techniques. In favorable circumstances, accuracy for the lifetime of better than 10% is frequently possible. In non-relativistic quantum mechanics, the calculation of the dipole matrix element can be carried out exactly only for the one-electron problem. For any more complex atom, it will be necessary to employ approximate wavefunctions to describe the upper and lower states of the transition. In practice, calculations are frequently made using both length and velocity matrix elements, agreement being interpreted as a favorable sign, although it is clear that this is not a guarantee of accuracy. The wavefunction will now become some linear combination of single configuration wavefunctions of the same total space and spin symmetry. The important perturbers have been generally supposed to be the terms of energy close to the term of interest." @default.
- W1845156988 created "2016-06-24" @default.
- W1845156988 creator A5031132084 @default.
- W1845156988 date "1969-01-01" @default.
- W1845156988 modified "2023-10-17" @default.
- W1845156988 title "The Calculation of Atomic Transition Probabilities" @default.
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