skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: CRF-PEPICO: Double velocity map imaging photoelectron photoion coincidence spectroscopy for reaction kinetics studies

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3]
  1. Department of Chemistry, University of the Pacific, Stockton, California 95211, USA
  2. Laboratory for Femtochemistry and Synchrotron Radiation, Paul Scherrer Institute (PSI), CH-5232 Villigen, Switzerland
  3. Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1361918
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 147; Journal Issue: 1; Related Information: CHORUS Timestamp: 2018-02-15 00:52:35; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Sztáray, Bálint, Voronova, Krisztina, Torma, Krisztián G., Covert, Kyle J., Bodi, Andras, Hemberger, Patrick, Gerber, Thomas, and Osborn, David L. CRF-PEPICO: Double velocity map imaging photoelectron photoion coincidence spectroscopy for reaction kinetics studies. United States: N. p., 2017. Web. doi:10.1063/1.4984304.
Sztáray, Bálint, Voronova, Krisztina, Torma, Krisztián G., Covert, Kyle J., Bodi, Andras, Hemberger, Patrick, Gerber, Thomas, & Osborn, David L. CRF-PEPICO: Double velocity map imaging photoelectron photoion coincidence spectroscopy for reaction kinetics studies. United States. doi:10.1063/1.4984304.
Sztáray, Bálint, Voronova, Krisztina, Torma, Krisztián G., Covert, Kyle J., Bodi, Andras, Hemberger, Patrick, Gerber, Thomas, and Osborn, David L. Fri . "CRF-PEPICO: Double velocity map imaging photoelectron photoion coincidence spectroscopy for reaction kinetics studies". United States. doi:10.1063/1.4984304.
@article{osti_1361918,
title = {CRF-PEPICO: Double velocity map imaging photoelectron photoion coincidence spectroscopy for reaction kinetics studies},
author = {Sztáray, Bálint and Voronova, Krisztina and Torma, Krisztián G. and Covert, Kyle J. and Bodi, Andras and Hemberger, Patrick and Gerber, Thomas and Osborn, David L.},
abstractNote = {},
doi = {10.1063/1.4984304},
journal = {Journal of Chemical Physics},
number = 1,
volume = 147,
place = {United States},
year = {Fri Jul 07 00:00:00 EDT 2017},
month = {Fri Jul 07 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on June 8, 2018
Publisher's Accepted Manuscript

Citation Metrics:
Cited by: 6works
Citation information provided by
Web of Science

Save / Share:
  • Here we report on a new simplified setup for velocity map photoelectron-photoion coincidence imaging using only a single particle detector. We show that both photoelectrons and photoions can be extracted toward the same micro-channel-plate delay line detector by fast switching of the high voltages on the ion optics. This single detector setup retains essentially all the features of a standard two-detector coincidence imaging setup, viz., the high spatial resolution for electron and ion imaging, while only slightly decreasing the ion time-of-flight mass resolution. The new setup paves the way to a significant cost reduction in building a coincidence imaging setupmore » for experiments aiming to obtain the complete correlated three-dimensional momentum distribution of electrons and ions.« less
  • A novel threshold photoelectron-photoion coincidence (TPEPICO) imaging spectrometer at the U14-A beamline of the Hefei National Synchrotron Radiation Laboratory is presented. A set of open electron and ion lenses are utilized to map velocity imaging of photoelectrons and photoions simultaneously, in which a repelling electric field using an extra lens is applied to magnify images of photoelectrons instead of traditional accelerating electric field in order to suppress the contribution of energetic electrons in the threshold photoelectron spectroscopy (TPES) and the mass-selected TPEPICO spectroscopy. The typical energy resolution of TPES is measured to be 9 meV (full width at half maximum),more » as shown on the {sup 2}P{sub 1/2} ionization of argon. The measured mass resolving power for the present TPEPICO imaging spectrometer is above 900 of M/{Delta}M. Subsequently as a benchmark, oxygen molecule is photoionized by monochromatic synchrotron radiation at 20.298 eV and dissociates to an oxygen atomic ion and a neutral oxygen atom, and the translation energy distribution of oxygen atomic ion is measured by the time-sliced imaging based on mass-selected TPEPICO experiment. The kinetic energy resolution of the present ion velocity imaging is better than 3% of {Delta}E/E.« less
  • 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{sup -1} field, which enables the direct measurement of rate constants in the 10{sup 3}-10{sup 7} s{sup -1} range. All electron and ion events are recorded in a triggerlessmore » 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.« less
  • We present a microwave discharge flow tube coupled with a double imaging electron/ion coincidence device and vacuum ultraviolet (VUV) synchrotron radiation. The system has been applied to the study of the photoelectron spectroscopy of the well-known radicals OH and OD. The coincidence imaging scheme provides a high selectivity and yields the spectra of the pure radicals, removing the ever-present contributions from excess reactants, background, or secondary products, and therefore obviating the need for a prior knowledge of all possible byproducts. The photoelectron spectra encompassing the X{sup 3}Σ{sup −} ground state of the OH{sup +} and OD{sup +} cations have beenmore » extracted and the vibrational constants compared satisfactorily to existing literature values. Future advantages of this approach include measurement of high resolution VUV spectroscopy of radicals, their absolute photoionization cross section, and species/isomer identification in chemical reactions as a function of time.« less
  • Cited by 15