Collision transfers between BH, A 1Π, v′ = 0 rotational states, induced by He, Ar, or H2 : Experiments
- 1 January 1982
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 76 (1) , 378-384
- https://doi.org/10.1063/1.442732
Abstract
BH is obtained by high‐frequency discharge in 2% B2H6 mixed with He, Ar, or H2. It is selectively excited by a pulsed dye laser to A 1ΙΙ, v′ = 0, J′ = 1, 4, or 7. From these rotational levels, the total collision cross sections are obtained by lifetime measurements at known pressures and temperatures. They decrease as J′ increases. They are smaller for He than for H2 or Ar. The rare gases induce only rotational transfers. H2 also induces a quenching which is much smaller than the rotational transfers. The relative intensities of the satellite lines are measured for J′ = 4 up to ΔJ′ = ±3 : the levels of the same total parity as the initial level are more populated than the levels of the opposite total parity, this propensity decreasing from He to H2 and to Ar. The polarization of the excited lines does not vary appreciably with the pressure.Keywords
This publication has 31 references indexed in Scilit:
- Collision-induced rotational transitions of dye laser excited Li2(A1Σu+) molecules: cross sections and their +ΔJ/-ΔJ asymmetryJournal of Physics B: Atomic and Molecular Physics, 1980
- The influence of hyperfine coherence and of elastic collisions on the circular polarisation of emission from Li2Chemical Physics, 1978
- On the electronic structure of polydiacetylenes as studied by the ab initio crystal orbital methodChemical Physics, 1978
- Dynamics of the collision induced rotational excitation of diatomic molecules in a Π(-state: Classical trajectory studies for the Li2(B1 Πu) - Noble gas systemChemical Physics, 1977
- Body-fixed formulation of rotational excitation: exact and centrifugal decoupling results for CO-HeJournal of Physics B: Atomic and Molecular Physics, 1976
- Lifetime of CdH and CdD a2Π state excited by a dye laserJournal de Physique Lettres, 1976
- Collision-induced rotational transitions of Na2(B1Πu)Journal of Physics B: Atomic and Molecular Physics, 1975
- Theory of collision induced rotational energy transfer in the Π-state of diatomic moleculesJournal of Physics B: Atomic and Molecular Physics, 1973
- Inelastic collision cross section of excited molecules. II. Asymmetries in the cross section for rotational transitions in the Na2(B1Πu) stateJournal of Physics B: Atomic and Molecular Physics, 1972
- The theory of scattering by a rigid rotatorProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1960