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Titolo:
The OH-yield in the reaction of O(D-1)+CH4 under high pressure conditions up to 560 bar helium
Autore:
Ausfelder, F; Hippler, H; Striebel, F;
Indirizzi:
Univ Karlsruhe, Lehrstuhl Mol Phys Chem, D-76128 Karlsruhe, Germany Univ Karlsruhe Karlsruhe Germany D-76128 hem, D-76128 Karlsruhe, Germany Univ Edinburgh, Dept Chem, Edinburgh EH9 3JJ, Midlothian, Scotland Univ Edinburgh Edinburgh Midlothian Scotland EH9 3JJ Midlothian, Scotland
Titolo Testata:
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
, volume: 214, anno: 2000,
parte:, 4
pagine: 403 - 417
SICI:
0942-9352(2000)214:<403:TOITRO>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
INDUCED FLUORESCENCE MEASUREMENTS; HIGH-PRESSURE RANGE; ENERGY-TRANSFER; VIBRATIONAL-RELAXATION; METHANOL; O(1D2); DECOMPOSITION; DEACTIVATION; TEMPERATURE; DEPENDENCE;
Keywords:
chemical kinetics; high pressures; LIF; methanol; OH quenching;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Hippler, H Univ Karlsruhe, Lehrstuhl Mol Phys Chem, Kaiserstr 12, D-76128 Karlsruhe, Germany Univ Karlsruhe Kaiserstr 12 Karlsruhe Germany D-76128 Germany
Citazione:
F. Ausfelder et al., "The OH-yield in the reaction of O(D-1)+CH4 under high pressure conditions up to 560 bar helium", Z PHYS CHEM, 214, 2000, pp. 403-417

Abstract

The pressure dependence of the OH yield in the reaction O(D-1) + CH4 has been investigated at room temperature in the pressure range from 4 to 560 bar of helium. O(D-1)-atoms were generated by pulsed laser photolysis (PLP) of N2O and OH-radicals were detected by saturated laser induced fluorescence(SLIF). The OH-yield was determined relative to the OH yield in the reaction of O(D-1) with H-2 which is assumed to be unity and pressure independent. Within the pressure range of our experiments we found a constant OH-yieldof (71 +/- 5)% in the reaction of O(D-1) with methane. From the OH fluorescence lifetime at the highest pressures near 500 bar of helium we obtained the rate constant for the collisional deactivation of electronically OH radicals of k(q)(He) = (3 +/- 0.3) x 10(-15) cm(3) s(-1), corresponding to a cross section of sigma(q)(He) = (2.1 +/- 0.2) x 10(-20) cm(2). The rate constant for collisional deactivation of vibrationally excited OH radicals in the electronic ground state OH(v = 1) + He --> OH(v = O) + He (reaction (5))was determined to be k(s)(He) = (1.2 +/- 0.2) x 10(-16) cm(3) s(-1).

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Documento generato il 21/09/20 alle ore 12:39:52