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Synchrotron photoionization measurements of combustion intermediates: the photoionization efficiency of HONO

Journal Article · · Chemical Physics Letters
 [1]; ; ;
  1. Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551

The HONO radical has recently been observed by photoionization mass spectrometry in low-pressure hydrogen-oxygen flames doped with NO2. The photoionization efficiency (PIE) spectrum has been measured between 10.83 and 11.63 eV. A Franck-Condon simulation using calculated geometries and force constants of the cation and neutral, and including the effects of Duschinsky rotation, is presented to describe the PIE as a function of photon energy. The simulated PIE is used as a fitting function to estimate the adiabatic ionization potential from the experimental data. The apparent ionization threshold of (10.97 +/- 0.03) eV is in excellent agreement with calculated values and is consistent with published bracketing determinations of the proton affinity of NO2.

Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
FG02-01ER15180
OSTI ID:
1062555
Report Number(s):
DOE-ER15180-37
Journal Information:
Chemical Physics Letters, Journal Name: Chemical Physics Letters Journal Issue: 1-3 Vol. 394; ISSN 0009-2614
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

References (27)

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Branching Ratio and Pressure Dependent Rate Constants of Multichannel Unimolecular Decomposition of Gas-Phase α-HMX:  An Ab Initio Dynamics Study journal March 2001
REMPI temperature measurement in molecular beam sampled low-pressure flames journal January 2002

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