| Autor: |
D. N. Stacey, P E G Baird, G K Woodgate, S A Blundell, C W P Palmer |
| Rok vydání: |
1987 |
| Předmět: |
|
| Zdroj: |
Journal of Physics B: Atomic and Molecular Physics. 20:3663-3681 |
| ISSN: |
0022-3700 |
| Popis: |
The theory of the field isotope shift (FS) in atomic spectra is discussed critically and the results are presented in a form which is more straightforward than the expressions traditionally used to interpret experimental data. First-order perturbation theory is applied within the single-particle framework to the case of an s or p1/2 electron outside closed shells. Parameters to take account of many-body effects are subsequently included. The nuclear and electronic dependences of the FS are separately discussed. In a generalisation of the work of Seltzer (1986), it is shown that the former can be represented as a series of even charge moments: the coefficients of the first three terms for an s electron are given. The difference between the series for an s and a p1/2 electron is shown to be generally insignificant. The electronic dependence enters through the (relativistic) probability density N of the electron at the origin; for the case of an s electron. They relate N to the magnetic hyperfine splitting factor alpha s. A table which allows N to be found from a measurement of alpha s is given. Second-order field shifts are of the order of 10-3-10-4 of the first-order shifts for a two-neutron change. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
