A photoelectron spectroscopy study of the valence shell photoionization dynamics of acetylene

A photoelectron spectroscopy study of the valence shell photoionization dynamics of acetylene

The valence shell photoionization dynamics of acetylene have been studied in the photon energy range 13–140 eV using photoelectron spectroscopy and synchrotron radiation. Photoelectron angular distributions and branching ratios have been determined for the X 2Π u, A 2Σ g + , B 2Σ u + and C 2Σ g + si...

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Bibliographic Details
Published in:Journal of electron spectroscopy and related phenomena Vol. 104; no. 1; pp. 245 - 255
Main Authors: Holland, D.M.P, MacDonald, M.A, Hayes, M.A, Karlsson, L, Wannberg, B
Format: Journal Article
Language:English
Published: Elsevier B.V 01-07-1999
Subjects:
Acetylene
Autoionization
Photoelectron spectroscopy
Shape resonance
Shape resonance
Autoionization
Photoelectron spectroscopy
Acetylene
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Summary:The valence shell photoionization dynamics of acetylene have been studied in the photon energy range 13–140 eV using photoelectron spectroscopy and synchrotron radiation. Photoelectron angular distributions and branching ratios have been determined for the X 2Π u, A 2Σ g + , B 2Σ u + and C 2Σ g + single-hole ionic states and for two inner valence correlation states. An interpretation of the experimental results was carried out based upon previous theoretical predictions, and it appears that the photoionization dynamics are being strongly affected by shape resonance phenomena. The photoelectron asymmetry parameters associated with the A 2Σ g + and the C 2Σ g + ionic states provide the first experimental confirmation of the predicted σ u continuum shape resonance.
ISSN:0368-2048
1873-2526
DOI:10.1016/S0368-2048(99)00024-9