Comparison of the acceleration, length, and velocity forms of the dipole operator in photoionization calculations
- 1 October 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 12 (4) , 1419-1424
- https://doi.org/10.1103/physreva.12.1419
Abstract
The acceleration, length, and velocity forms of the dipole operator are used to calculate the subshell photoionization cross sections in argon. First-order electron correlation corrections to the Hartree-Fock approximation are obtained through the use of many-body perturbation theory. For low-energy transitions the acceleration form of the operator is found to give very large errors in the Hartree-Fock approximation as compared to the length and velocity operators. Correlation effects for the three operator formulations are found to be quite different.Keywords
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