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Inelastic collisions in molecular nitrogen at low temperature (2<T<50 K)

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dc.creator Fonfría, José Pablo
dc.creator Ramos, Ángel
dc.creator Thibault, Franck
dc.creator Tejeda, Guzmán
dc.creator Fernández Sánchez, José María
dc.creator Montero, Salvador
dc.date 2008-01-30T18:07:20Z
dc.date 2008-01-30T18:07:20Z
dc.date 2007-10-03
dc.date.accessioned 2017-01-31T00:59:53Z
dc.date.available 2017-01-31T00:59:53Z
dc.identifier The Journal Of Chemical Physics 127, 134305 (2007)
dc.identifier 0021-9606
dc.identifier http://hdl.handle.net/10261/2798
dc.identifier 10.1063/1.2784255
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2798
dc.description Theory and experiment are combined in a novel approach aimed at establishing a set of two-body state-to-state rates for elementary processes ij->lm in low temperature N2:N2 collisions involving the rotational states i, j, l, m. First, a set of 148 collision cross sections is calculated as a function of the collision energy at the converged close-coupled level via the MOLSCAT code, using a recent potential energy surface for N2–N2. Then, the corresponding rates for the range of 2<T<50 K are derived from the cross sections. The link between theory and experiment, aimed at assessing the calculated rates, is a master equation which accounts for the time evolution of rotational populations in a reference volume of gas in terms of the collision rates. In the experiment, the evolution of rotational populations is measured by Raman spectroscopy in a tiny reference volume 2E-3 mm3 of N2 traveling along the axis of a supersonic jet. The calculated collisional rates are assessed experimentally in the range of 4<T<35 K by means of the master equation, and then are scaled by averaging over a large set of experimental data. The scaled rates account accurately for the evolution of the rotational populations measured in a wide range of conditions. Accuracy of 10% is estimated for the main scaled rates.
dc.description This work has been supported by the Spanish Ministerio de Educación y Ciencia, research Project Nos. FIS2004-02576, HF2004-232, ESP2004-21060-E, and ASTROCAM network. J.P.F. is indebted to the CSIC for an I3P grant.
dc.description Peer reviewed
dc.format 327789 bytes
dc.format 3343 bytes
dc.format 12700 bytes
dc.format application/pdf
dc.format text/plain
dc.format text/plain
dc.language eng
dc.publisher American Institute of Physics
dc.relation http://dx.doi.org/10.1063/1.2784255
dc.rights openAccess
dc.subject nitrogen
dc.subject collisions
dc.subject low temperature
dc.title Inelastic collisions in molecular nitrogen at low temperature (2<T<50 K)
dc.type Artículo


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