A discharge flow-photoionization mass spectrometric study of HOBr([ital X] [sup 1][ital A][prime]): Photoion yield spectrum, ionization energy, and thermochemistry

Journal Article · Tue Feb 01 00:00:00 EST 1994 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.466543· OSTI ID:5285256

Monks, P S; Stief, L J ^[1]; Krauss, M ^[2]; Kuo, S C; Klemm, R B ^[3]

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1. Laboratory for Extraterrestrial Physics, NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771 (United States)
2. Center for Advanced Research in Biotechnology, NIST, Rockville, Maryland 20850 (United States)
3. DAS-815, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)

The photoion yield spectrum of HOBr was measured over the wavelength range [lambda]=108--121 nm by using a discharge flow-photoionization mass spectrometer apparatus coupled to a synchrotron radiation source. HOBr was generated by the reaction of OH with molecular bromine. A value of (10.62[plus minus]0.04) eV was obtained for the adiabatic ionization energy (I.E.) of HOBr from photoion thresholds, corresponding to the HOBr[sup +]([sup 2][ital A][double prime])[l arrow]HOBr([sup 1][ital A][prime]) transition. The structure observed in the spectrum is discussed in terms of the available states for HOBr[sup +], which have been determined using multiconfiguration-self-consistent field calculations. A new value for [Delta][ital H][sup 0][sub [ital f] 298](HOBr) of [minus]9 kcal mol[sup [minus]1] is derived from I.E.(HOBr) and estimates of [Delta][ital H][sub [ital f]](HOBr[sup +]).

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5285256
• Journal Information: Journal of Chemical Physics; (United States), Vol. 100:3; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BROMINE COMPLEXES
IONIZATION POTENTIAL
PHOTOIONIZATION
HYDROXYL RADICALS
BROMINE
CHEMICAL REACTIONS
ENERGY-LEVEL TRANSITIONS
IONS
MASS SPECTROMETERS
MOLECULAR IONS
PHOTOLYSIS
STRATOSPHERE
SYNCHROTRON RADIATION
THRESHOLD ENERGY
YIELDS
BREMSSTRAHLUNG
CHARGED PARTICLES
COMPLEXES
DECOMPOSITION
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY
HALOGENS
IONIZATION
MEASURING INSTRUMENTS
NONMETALS
PHOTOCHEMICAL REACTIONS
RADIATIONS
RADICALS
SPECTROMETERS
664200* - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)
664400 - Experimentally Derived Information on Atomic & Molecular Properties- (1992-)