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State-to-State Reactive Scattering of F+H2 in Supersonic Jets: Nascent Rovibrational HF(v,J) Distributions Via Direct IR Laser Absorption

Published

Author(s)

W B. Chapman, B W. Blackmon, David Nesbitt

Abstract

Pulsed discharge sources of supersonically cooled F radicals have been crossed with supersonically cooled H2 to study the F(2P3/2, 2P1/2)+H2->HF(Ņ,J)+H reaction under single collision conditions with a collision energy of 1.8(2) kcal/mol. The HF(Ņ,J) product states are probed via direct absorption of a single mode, tunable near IR laser perpendicular to the plane of intersection of the two jet axes. The high spectral resolution (δŅnearly equal to}0.0001 cm-1) permits the quantum state HF(Ņ,J) distribution to be determined with complete resolution of final rovibrational levels. The J-dependent integral cross sections for HF(Ņ=3,J) are compared with exact quantum scattering calculations by Castillo and Manolopoulous on the ground adiabatic potential energy surface of Stark and Werner. Agreement between theory and experiment is quire good for low J(<3) states. However, theory substantially underpredicts the experimental distributions for high J(greater then or equal to} 3) states near the energetic cutoff or ground spin orbit state F(2P3/2) atoms, which may indicate the presence of non-adiabatic reaction channels involving spin orbit excited F* (2P1/2) atoms.
Citation
Journal of Chemical Physics
Volume
107
Issue
No. 19

Keywords

F&H<sub>2</sub>, IR laser absorption, nascent robibrational distribution, non-adiabatic effects, reactive scattering

Citation

Chapman, W. , Blackmon, B. and Nesbitt, D. (1997), State-to-State Reactive Scattering of F+H2 in Supersonic Jets: Nascent Rovibrational HF(v,J) Distributions Via Direct IR Laser Absorption, Journal of Chemical Physics (Accessed April 13, 2024)
Created October 31, 1997, Updated October 12, 2021