Isotope effect in collision between helium atom and hydrogen bromide molecule

Rotational relaxation rates for HBr(v = 1) colliding with helium atoms at room temperature have been measured using a time-resolved optical-optical double resonance technique. Rotational state selective excitation of v = 1 for rotational levels in the range J = 1-9 was achieved by stimulated Raman pumping. The population decay in the prepared states and the transfer of population to nearby rotational states was monitored via 2 + 1 resonance-enhanced multiphoton ionization (REMPI) spectroscopy using the g(3)Σ(-)-X(1)Σ(+) (0-1) band. Collision-induced population evolution for transfer events with |ΔJ| ≤ 8 was observed at pressures near 0.7 Torr. The experimental data were analyzed using fitting and scaling functions to generate state-to-state rotational energy transfer rate constant matrices. Total depopulation rate constants were found to be in the range (1.3 to 2.0) × 10(-10) cm(3) s(-1). As a test of current computational methods, state-to-state rotational energy transfer rate constants were calculated using ab initio theory. The total removal rate constants were in good agreement with the measured values, but the transfer probabilities for events with |ΔJ| ≥ 3 were underestimated. Inspection of the anisotropic characteristics of the potential energy surface did not yield an obvious explanation for the discrepancies, but it is most likely that the problem stems from inaccuracies in the potential surface.

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Experimental and Theoretical Investigations of Rotational Energy Transfer in HBr + He Collisions

Kabir

Antonov

Merritt

2010

J. Phys. Chem. A

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PES and transport properties of the He⋯HBr complex from kinetic theory and molecular dynamics simulations

Aghababaei,

Nemati-Kande

2024

Phys. Chem. Chem. Phys.

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Isotope effect in collision between helium atom and hydrogen bromide molecule

Abstract: Isotope effect in collision between helium atom and hydrogen bromide molecule *Yu Chun-Ri( ) a) † , Cheng Xin-Lu( ) b) , and Yang Xiang-Dong( ) b) ‡

Cited by 2 publications

References 14 publications

Experimental and Theoretical Investigations of Rotational Energy Transfer in HBr + He Collisions

Experimental and Theoretical Investigations of Rotational Energy Transfer in HBr + He Collisions

PES and transport properties of the He⋯HBr complex from kinetic theory and molecular dynamics simulations

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