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 · Mon Jan 31 23:00:00 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), Journal Name: Journal of Chemical Physics; (United States) Vol. 100:3; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

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