Fast-electron-impact study on excitations of 4p, 4s, and 3d electrons of krypton - art. no. 062701

摘要

Absolute optical. oscillator strength densities for the excitations of the electrons 4p, 4s, and 3d have been measured. Their absolute optical oscillator strengths have also. been obtained,. An enhancement above the 4p ionization threshold in the photoabsorption spectrum was assigned as a delayed maximum which arises from the photoionization process of 4p-->epsilond according to present, Dirac-Slater calculation. In the energy region of 4s autoionization, we have observed several features that are absent in previous fast-electron-impact work,, but exist in optical measurements. We clarify this discrepancy here. Two Rydberg series of optically forbidden transitions, i.e., 4s(-1)ns(S-1) (n=5,6,7) and 4s(-1)nd(D-1) (n=4,5,6,7) have been observed when the spectrometer worked at conditions with larger momentum transfers, namely, K-2 = 0.23 a.u. and 0.67 a.u. Furthermore, the absolute optical oscillator strengths for the 3d excitation have been obtained. [References: 58]