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

Journal Article · Sat Dec 15 04:00:00 EST 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.459292· OSTI ID:6146002

Vaccaro, P H; Zhao, D; Tsekouras, A A; Leach, C A; Ernst, W E; Zare, R N ^[1]

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1. Department of Chemistry, Stanford University, Stanford, CA 94305-5080 (USA)

Through application of energy-balance arguments to the crossed-beam reaction Ba({sup 1}{ital S}{sub 0})+HI({ital X} {sup 1}{Sigma}{sup +}) {r arrow}BaI({ital X} {sup 2}{Sigma}{sup +}) +H({sup 2}{ital S}{sub 1/2}), a lower limit for the BaI bond dissociation energy is determined to be {ital D}{sup 0}{sub 0}(BaI) {approx gt}76.8{plus minus}1.7 kcal/mol (3.33{plus minus}0.07 eV). Based on the upper bound of {ital D}{sup 0}{sub 0}(BaI) {approx lt}78.5{plus minus}0.5 kcal/mol, as determined from earlier predissociation studies (M. A. Johnson, J. Allison, and R. N. Zare, J. Chem. Phys. {bold 85}, 5723 (1986)), we recommend a BaI bond strength of 77.7{plus minus}2.0 kcal/mol (3.37{plus minus}0.09 eV). This dissociation energy is more than 5 kcal/mol higher than the previously accepted value of {ital D}{sup 0}{sub 0}(BaI) as derived from mass spectrometric measurements.

• OSTI ID: 6146002
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 93:12; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
BARIUM
BARIUM COMPOUNDS
BARIUM IODIDES
BEAMS
CHEMICAL BONDS
CHEMICAL REACTIONS
COLLISIONS
DISSOCIATION ENERGY
ELEMENTS
ENERGY
ENERGY BALANCE
HALIDES
HALOGEN COMPOUNDS
HYDRIODIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IODIDES
IODINE COMPOUNDS
LASER SPECTROSCOPY
METALS
MOLECULAR BEAMS
MOLECULE COLLISIONS
SPECTROSCOPY