Photoion spectra in coincidence with threshold electrons near the Ar 2p ionisation limits
- 14 October 1988
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 21 (19) , 3203-3209
- https://doi.org/10.1088/0953-4075/21/19/011
Abstract
The yield spectra of Ar2+ and Ar3+ ions in coincidence with threshold electrons near the 2p ionisation limits have been measured using a time-of-flight mass spectrometer and synchrotron radiation. Below the 2p ionisation limits, the Ar2+ yield spectrum exhibits a prominent peak corresponding to the the 2p-14d, 5d and 6d resonance states. It is proposed that these resonance states can decay by emitting threshold electrons through two-step autoionisation, such as Ar 2p-15d to Ar+ 3p-2(1D)6d to Ar2+ 3p-2(3P). Above the 2p ionisation limits, the Ar2+ and Ar3+ yield spectra exhibit two dominant peaks. These peaks show the effect of post-collision interaction, namely shifts of peak positions and asymmetric profiles. The shifts are almost the same in the Ar2+ and Ar3+ yield spectra.Keywords
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