Abstract
The levels in and the level in have been measured by x-ray photoelectron spectroscopy with the use of 1486.6-eV () radiation. The binding energies have been calculated for the atomic species, as well as for atomic phosphorus, as the difference between the total energies of the hole state and the ground (neutral) state SCF ( self-consistent field method), using the Dirac-Fock program of Desclaux, to which is added the respective correlation-energy difference between the two states. The calculated values of 140.70 eV for , 1368.89 eV for , and 1484.88 eV for include a 0.7-1.0-eV increase due to the effects of correlation, consistent with earlier work done on the K and Zn atoms. The atomic binding energies were calculated similarly with the use of available Dirac-Slater SCF values. When we combine these with the measured molecular binding energy of , , and we obtain corresponding chemical shifts (atom-molecule) of 3.5, 3.0, and 2.4 eV, respectively. Comparison is also made between the atomic, molecular, and solid-state binding energies of As and Se, and it is found that the solid-state binding energy is the lowest of the three in both cases, as expected from consideration of extra-atomic relaxation.
- Received 31 January 1983
DOI:https://doi.org/10.1103/PhysRevA.28.2634
©1983 American Physical Society