| 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 |
|