Observation of Cd 4d{sup 9}5s{sup 2}5p J=3 autoionizing levels in (e,2e) energy spectra
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States); Physics Department, Royal Holloway, University of London, Egham, Surrey TW20 0EX (United Kingdom)
Cadmium (e,2e) energy spectra have been measured for kinematics corresponding to a momentum transfer of 1 a.u. Two previously unknown cadmium autoinizing levels have been observed. Their energies are in excellent agreement with existing {ital ab initio} structure calculations of the 4d{sup 9}5s{sup 2}5p J=3 levels. One level is easily seen at an ejected-electron direction along the momentum-transfer axis, but is absent for a direction 39{degree} away from this axis. The opposite is true for the other level; it is absent in the former, but present in the latter case. This behavior is in agreement with a calculation that takes into account that the J=3 levels can autoionize into both singlet and triplet 5sEf continua. The intensity of the new levels, relative to the well-known 4d{sup 9}5s{sup 2}5p J=1 levels, agrees well with a plane-wave Born approximation calculation for the J=3 levels. The third 4d{sup 9}5s{sup 2}5p J=3 level is calculated to lie within the broad 4d{sup 9}5s{sup 2}5p {sup 1}P{sub 1} level and cannot be seen in the present experiments. {copyright} {ital 1998} {ital The American Physical Society}
- DOE Contract Number:
- FG02-91ER14214
- OSTI ID:
- 678732
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 6 Vol. 57; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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