We report measurements of the circular polarization correlation parameter P3 for the excitation of the 4 s′[1/2]j=1 state in Ar by 40 eV electrons and for the excitation of the Kr 5 s[3/2]J=1 state by 30 eV electrons at electron scattering angles up to 50°. The measured Ar data are compared to predictions of a distorted wave Born approximation (DWBA). The agreement is in general not very good with theory predicting P3 values considerably larger than the measured values in the regime of small scattering angles. In Kr, where the measured data are compared to theoretical predictions from a DWBA, a first-order many-body theory (FOMBT) and a relativistic distorted wave theory (RDW), the level of agreement between experiment and theory is somewhat better. The measured P3 parameters in conjunction with the previously measured linear coherence parameters P1 und P2 under the same scattering conditions yield the total polarization Ptot+ which is a measure for the level of coherence in the excitation process. In both cases studied here, we found values of eliminate Ptot+ that were consistent with a fully coherent excitation process.
|Original language||English (US)|
|Number of pages||4|
|Journal||Zeitschrift für Physik D Atoms, Molecules and Clusters|
|State||Published - Jun 1994|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics