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A discharge flow-photoionization mass spectrometric study of the FO(X 2 Pi i) radical. Photoionization efficiency spectrum and ionization energyPhotoionization efficiency spectra of FO were measured over the wavelength range 80.0-100.0 nm and in the ionization threshold region, 94.0-100.0 nm, using a discharge flow-photoionization mass spectrometer apparatus coupled to a synchrotron radiation source. FO was generated by the reaction of F2P atoms with NO3 and via a F2O2 discharge. A value of 12.78 +/- 0.03 eV was obtained for the adiabatic ionization energy of FO from photoion thresholds which corresponds to FO(+)(X 3 Sigma -) from FO(X 2 Pi i). These results, which are the first to be obtained by direct Photo-ionization mass spectrometry (PIMS) measurements, corroborate those of a photoelectron spectroscopy (PES) study; however, the ionization energy determined here is free from interferences due to other species which complicated the PES measurement. A value of 109.5 +/- 8.0 kJ/mol for Delta f H 0 298(FO) is computed from the present value of IE(FO) and a previous appearance energy measurement, and a value for the proton affinity of FO is calculated to be 511.5 +/- 10.0 kJ/mol.
Document ID
19950057801
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Zhang, Zhengyu
(Brookhaven National Laboratory, Building 815, P.O. Box 5000, Upton, NY 11973-5000 United States)
Kuo, Szu-Cherng
(Brookhaven National Laboratory, Building 815, P.O. Box 5000, Upton, NY 11973-5000 United States)
Klemm, R. Bruce
(Brookhaven National Laboratory, Building 815, P.O. Box 5000, Upton, NY 11973-5000 United States)
Monks, Paul S.
(Laboratory for Extraterrestrial Physics, NASA/Goddard Space Flight Center Greenbelt, MD 20771, United States)
Stief, Louis J.
(Laboratory for Extraterrestrial Physics, NASA/Goddard Space Flight Center Greenbelt, MD 20771, United States)
Date Acquired
August 16, 2013
Publication Date
November 4, 1994
Publication Information
Publication: Chemical Physics Letters
Volume: 229
Issue: 4-5
ISSN: 0009-2614
Subject Category
Atomic And Molecular Physics
Accession Number
95A89400
Distribution Limits
Public
Copyright
Other

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