Molecular single photon double K-shell ionization

We have studied single photon double K-shell ionization of small molecules (N2, CO, C2H2n (n=1–3), …) and the Auger decay of the resulting double core hole (DCH) molecular ions thanks to multi-electron coincidence spectroscopy using a magnetic bottle time-of-flight spectrometer. The relative cross-s...

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Bibliographic Details
Published in:Journal of electron spectroscopy and related phenomena 2014-10, Vol.196, p.38-42
Main Authors: Penent, F., Nakano, M., Tashiro, M., Grozdanov, T.P., Žitnik, M., Carniato, S., Selles, P., Andric, L., Lablanquie, P., Palaudoux, J., Shigemasa, E., Iwayama, H., Hikosaka, Y., Soejima, K., Suzuki, I.H., Kouchi, N., Ito, K.
Format: Article
Language:English
Subjects:
Auger spectroscopy
Augers
Carbon monoxide
Chemical shift
Coincidence electron spectroscopy
Cross sections
Decay
Double K-shell ionization
Ionization
Molecular ions
Photons
Spectroscopy
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Summary:We have studied single photon double K-shell ionization of small molecules (N2, CO, C2H2n (n=1–3), …) and the Auger decay of the resulting double core hole (DCH) molecular ions thanks to multi-electron coincidence spectroscopy using a magnetic bottle time-of-flight spectrometer. The relative cross-sections for single-site (K−2) and two-site (K−1K−1) double K-shell ionization with respect to single K-shell (K−1) ionization have been measured that gives important information on the mechanisms of single photon double ionization. The spectroscopy of two-site (K−1K−1) DCH states in the C2H2n (n=1–3) series shows important chemical shifts due to a strong dependence on the CC bond length. In addition, the complete cascade Auger decay following single site (K−2) ionization has been obtained.
ISSN:0368-2048
1873-2526
DOI:10.1016/j.elspec.2013.10.002