AI Article Synopsis
- An imaging photoelectron photoion coincidence spectrometer has been developed at the Swiss Light Source, utilizing monochromatic VUV radiation to ionize gas-phase samples.
- The system features high-resolution velocity focusing of photoelectrons, which serve as start signals for measuring the time-of-flight of ions, allowing for direct measurement of reaction rate constants.
- Initial measurements include investigating threshold photoelectron spectra of argon dimers and analyzing breakdown processes for hydrogen and chlorine atom losses in methane and chlorobenzene, respectively.
Article Abstract
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, 40-80 V cm(-1) field, which enables the direct measurement of rate constants in the 10(3)-10(7) s(-1) 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 >100 kHz 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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| http://dx.doi.org/10.1063/1.3082016 | DOI Listing |
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