Polarization of {ital K}-shell x-ray transitions of Ti{sup 19+} and Ti{sup 20+} excited by an electron beam
- Department of Physics and Space Technology, Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
- Department of Physics, University of Nevada, Reno, Nevada 89557 (United States)
- Department of Physics, Morehouse College, Atlanta, Georgia 30314 (United States)
The x-ray spectrum of heliumlike Ti{sup 20+} excited by a monoenergetic electron beam was measured at an energy just above the electron-impact excitation threshold (4800 eV) with a pair of polarization-sensitive spectrometers. Values for the linear polarization were inferred for the 1s2p&hthinsp;{sup 1}P{sub 1}{r_arrow}1s{sup 2}&hthinsp;{sup 1}S{sub 0} resonance line, the 1s2p&hthinsp;{sup 3}P{sub 1}{r_arrow}1s{sup 2}&hthinsp;{sup 1}S{sub 0} intercombination line, the 1s2p&hthinsp;{sup 3}P{sub 2}{r_arrow}1s{sup 2}&hthinsp;{sup 1}S{sub 0} magnetic quadrupole line, and the 1s2s&hthinsp;{sup 3}S{sub 1}{r_arrow}1s{sup 2}&hthinsp;{sup 1}S{sub 0} forbidden line, as well as for the 1s2s2p&hthinsp;{sup 2}P{sub 3/2}{r_arrow}1s{sup 2}2s&hthinsp;{sup 2}S{sub 1/2} resonance line in Ti{sup 19+}. Relativistic distorted-wave calculations of the magnetic sublevel-specific electron-impact excitation cross sections are presented for comparison. Combined with earlier measurements of iron, the results confirm the predicted {ital Z} dependence of the polarization. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 692555
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 60; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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