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Low-temperature rotational relaxation of CO in self-collisions and in-collisions with Ne and He

AuthorsAmaral, G. A.; Aoiz, F. Javier ; Bañares, Luis; Barr, J.; Herrero, Víctor J. ; Martínez-Haya, Bruno; Menéndez, M.; Pino, G.A.; Tanarro, Isabel ; Torres, Isabel; Verdasco, J.E.
Issue Date2005
PublisherAmerican Chemical Society
CitationThe journal of physical chemistry, A, Molecules, spectroscopy, kinetics, environment & general theory 109: 9402- 9413 (2005)
AbstractThe low-temperature rotational relaxation of CO in self-collisions and in collisions with the rare-gas atoms Ne and He has been investigated in supersonic expansions with a combination of resonance-enhanced multiphoton ionization (REMPI) spectroscopy and time-of-flight techniques. For the REMPI detection of CO, a novel 2 + 1′ scheme has been employed through the A1 state of CO. From the measured data, average cross sections for rotational relaxation have been derived as a function of temperature in the range 5-100 K. For CO-Ne and CO-He, the relaxation cross sections grow, respectively, from values of ∼20 and 7 Å2 at 100 K to values of ∼65-70 and ∼20 A°2 in the 5-20 K temperature range. The cross section for the relaxation of CO-CO grows from a value close to 40 Å2 at 100 K to a maximum of 60 Å2 at 20 K and then decreases again to 40 Å2 at 5 K. These results are qualitatively similar to those obtained previously with the same technique for N2-N 2, N2-Ne, and N2-He collisions, although in the low-temperature range (T < 20 K) the CO relaxation cross sections are significantly larger than those for N2. Some discrepancies have been found between the present relaxation cross sections for CO-CO and CO-He and the values derived from electron-induced fluorescence experiments. © 2005 American Chemical Society.
Identifiersdoi: 10.1021/jp051766u
issn: 1089-5639
Appears in Collections:(CFMAC-IEM) Artículos
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