An imaging photoelectron photoion coincidence spectrometer at the vacuum ultraviolet (VUV) beamline of the Swiss Light Source is presented and a few initial measurements are reported. Monochromatic synchrotron VUV radiation ionizes the cooled or thermal gas-phase sample. Photoelectrons are velocity focused, with better than 1 meV resolution for threshold electrons, and also act as start signal for the ion time-of-flight analysis. The ions are accelerated in a relatively low, field, which enables the direct measurement of rate constants in the range. All electron and ion events are recorded in a triggerless multiple-start/multiple-stop setup, which makes it possible to carry out coincidence experiments at event frequencies. As examples, the threshold photoelectron spectrum of the argon dimer and the breakdown diagrams for hydrogen atom loss in room temperature methane and the chlorine atom loss in cold chlorobenzene are shown and discussed.
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March 2009
Research Article|
March 03 2009
Imaging photoelectron photoion coincidence spectroscopy with velocity focusing electron optics
Andras Bodi;
Andras Bodi
a)
1
Paul Scherrer Institut
, Villigen 5232, Switzerland
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Melanie Johnson;
Melanie Johnson
1
Paul Scherrer Institut
, Villigen 5232, Switzerland
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Thomas Gerber;
Thomas Gerber
1
Paul Scherrer Institut
, Villigen 5232, Switzerland
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Zsolt Gengeliczki;
Zsolt Gengeliczki
2Institute of Chemistry,
Eötvös Loránd University
, Budapest 1117, Hungary
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Bálint Sztáray;
Bálint Sztáray
3Department of Chemistry,
University of the Pacific
, Stockton, California 95211, USA
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Tomas Baer
Tomas Baer
4Department of Chemistry,
University of North Carolina
, Chapel Hill, North Carolina 27599, USA
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a)
Author to whom correspondence should be addressed. Electronic mail: andras.boedi@psi.ch.
Rev. Sci. Instrum. 80, 034101 (2009)
Article history
Received:
November 09 2008
Accepted:
January 23 2009
Citation
Andras Bodi, Melanie Johnson, Thomas Gerber, Zsolt Gengeliczki, Bálint Sztáray, Tomas Baer; Imaging photoelectron photoion coincidence spectroscopy with velocity focusing electron optics. Rev. Sci. Instrum. 1 March 2009; 80 (3): 034101. https://doi.org/10.1063/1.3082016
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