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Laser spectroscopy of crossed molecular beams: The dissociation energy of BaI from energy-balance measurements

J. Chem. Phys. 93, 8544 (1990); doi:10.1063/1.459292

Issue Date: 15 December 1990

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P. H. Vaccaro, D. Zhao, A. A. Tsekouras, C. A. Leach, W. E. Ernst, and R. N. Zare
Department of Chemistry, Stanford University, Stanford, California 94305-5080
Through application of energy-balance arguments to the crossed-beam reaction Ba(1S0)+HI(X 1Sigma+) -->BaI(X 2Sigma+) +H(2S1/2), a lower limit for the BaI bond dissociation energy is determined to be D<sup>0</sup><sub>0</sub>(BaI) >~76.8±1.7 kcal/mol (3.33±0.07 eV). Based on the upper bound of D<sup>0</sup><sub>0</sub>(BaI) <~78.5±0.5 kcal/mol, as determined from earlier predissociation studies [M. A. Johnson, J. Allison, and R. N. Zare, J. Chem. Phys. 85, 5723 (1986)], we recommend a BaI bond strength of 77.7±2.0 kcal/mol (3.37±0.09 eV). This dissociation energy is more than 5 kcal/mol higher than the previously accepted value of D<sup>0</sup><sub>0</sub>(BaI) as derived from mass spectrometric measurements. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 30 August 1990; accepted 13 September 1990
Permalink: http://link.aip.org/link/?JCPSA6/93/8544/1
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KEYWORDS and PACS

Keywords
PACS
  • 34.50.Lf
    Atomic and molecular collision processes and interactions Inelastic scattering of atoms and molecules Chemical reactions, energy disposal, and angular distribution, as studied by atomic and molecular beams
  • 35.20.Gs
    Experimentally derived information on atoms and molecules; instrumentation and techniques Molecules Bond strengths, dissociation energies, hydrogen bonding, etc.
  • 82.40.Dm
    Physical chemistry Chemical kinetics and reactions: special regimes and techniques Atomic and molecular beam reactions
  • YEAR: 1990

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
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REFERENCES (48)
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