TITLE

State-resolved differential and integral cross sections for the reaction H+D[sub 2]→HD(v[sup ′]=3,j[sup ′]=0–7)+D at 1.64 eV collision energy

AUTHOR(S)
Bean, Brian D.; Ayers, James D.; Ferna´ndez-Alonso, Fe´lix; Zare, Richard N.
PUB. DATE
April 2002
SOURCE
Journal of Chemical Physics;4/15/2002, Vol. 116 Issue 15, p6634
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A 212.8 nm laser initiates the reaction H+D[sub 2]→HD+D in a mixture of HBr and D[sub 2]. A second laser state-selectively ionizes the HD(v[sup ′]=3,j[sup ′]) reaction product, allowing a determination of the speed distribution and the relative cross section in a velocity-sensitive time-of-flight mass spectrometer. From these measurements we construct differential and integral cross sections for H+D[sub 2]→HD(v[sup ′]=3,j[sup ′]=0–7)+D at 1.64±0.05 eV collision energy. Although the integral cross sections do not show any unusual features, the differential cross sections reveal forward-scattered features that have not been observed in crossed-beam experiments. An analysis of the scattering features in HD(v[sup ′]=3,j[sup ′]=1–4) suggests that these states are dominated by classical hard-sphere scattering. This hard-sphere (direct recoil) mechanism, however, cannot account for the dominant forward scattering observed in HD(v[sup ′]=3,j[sup ′]=0). © 2002 American Institute of Physics.
ACCESSION #
6427014

 

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