Rotationally inelastic cross sections have been calculated according to a quantat static rotation (sudden) approximation and the quasiclassical method for 4He + If(j = 12) (rigid rotas) at an ioitial relative kinetic energy of 0.M eV\_ Comparison of the two sets of results shows excelient agreement.
Fully converged sudden rotation total integral cross sections for 4He + H2 (ν = 0, j = 0) → 4He + H2 (ν′ = 1, j′)
✍ Scribed by Steven C. Leasure; Joel M. Bowman
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 471 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Total integral cross sections for 4He f H2 (XI=: 0, j = 0) --, 4He + H2 (i= 1,j' = 0,2) have been calcuIated in the total energy range 1.2 to 5.5 eV, according to a quanta1 suddenapprovimation for the H2 rotational degrees of freedom and a cIose coupling expansion of the vibrationa degree of freedom. Convergence of the above cross sections is investigated by employing four vibration basis sets in the close coupling calculations, i.e., u = 0, 2, u =O,
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Fully converged quantum cross sections for 4He-D2 (u= l,i=O) vibrational reliaxation were determined using the coupled-states method and a modikied version of the Gordon-Secrcst surface. First-order forbidden rotational transitions play a si@fkant role, comparable to that observed previously for the