Absolute photoionization cross sections of Ba in the autoionization region of 209-221 nm have been measured with a bandwidth of 0.0014 nm. The measured cross sections are compared with those obtained from R-matrix calculations combined with multichannel quantum defect theory (MQDT) techniques. The variations of the experimental lineshape parameters for the 5d(2D3/2)np[ 1/2 ] and 5d(2D5/2)np[3/2] series are analyzed with empirical three-channel MQDT models. From the calculation of partial density of states in 6pns channels, the perturber of the 5d(2D3/2)np[ 1/2 ] series is confirmed to be the 6p7s 3P1 level and that of the 5d(2D5/2)np[3/2] series is identified as the 6p7s 1P1 level.
|Number of pages||24|
|Journal||Journal of Physics B: Atomic, Molecular and Optical Physics|
|Publication status||Published - 2000 May 28|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics