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The role of orbiting resonances in the vibrational relaxation of I 2(B,v′ = 21) by collisions with He at very low energies: A theoretical and experimental study

AuthorsGarcía Vela, Alberto ; Cabanillas Vidosa, I; Ferrero, J.C.; Pino, G.A.
Issue Date2012
PublisherRoyal Society of Chemistry (UK)
CitationPhysical Chemistry Chemical Physics 14: 5570- 5580 (2012)
AbstractThe low-energy collisions of I 2(B,v′ = 21) with He involving collision-induced vibrational relaxation of I 2 are investigated both experimentally and by means of wave packet simulations. The theoretical cross sections exhibit a structure of peaks originated by orbiting resonances of the I 2(B,v′ = 21) - He van der Waals complex formed in the I 2 + He collisions. Such a structure has similar characteristics as the structure of peaks found in the experimental cross sections. In fact, four of the five peaks of the measured cross sections appear at positions nearly coincident with those of four of the peaks found in the theoretical cross sections. Thus this result confirms the experimental finding that enhancement of I 2 vibrational relaxation is caused by the population of I 2(B,v′ = 21) - He orbiting resonances populated upon the low-energy collisions. The possibility of using this mechanism in the vibrational cooling of diatomic molecules is discussed. © the Owner Societies 2012.
Identifiersdoi: 10.1039/c2cp24061k
issn: 1463-9076
Appears in Collections:(CFMAC-IFF) Artículos
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