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Titolo:
ULTRALOW TEMPERATURE KINETICS OF NEUTRAL-NEUTRAL REACTIONS - THE TECHNIQUE AND RESULTS FOR THE REACTIONS CN-2 DOWN TO 13 K AND CN+NH3 DOWN TO 25 K(O)
Autore:
SIMS IR; QUEFFELEC JL; DEFRANCE A; REBRIONROWE C; TRAVERS D; BOCHEREL P; ROWE BR; SMITH IWM;
Indirizzi:
UNIV BIRMINGHAM,SCH CHEM BIRMINGHAM B15 2TT W MIDLANDS ENGLAND UNIV RENNES 1,SCH CHEM,DEPT PHYS ATOM & MOLEC,UA 1203 F-35042 RENNES FRANCE
Titolo Testata:
The Journal of chemical physics
fascicolo: 6, volume: 100, anno: 1994,
pagine: 4229 - 4241
SICI:
0021-9606(1994)100:6<4229:UTKONR>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
ION-MOLECULE REACTIONS; INDUCED FLUORESCENCE MEASUREMENTS; POTENTIAL-ENERGY SURFACES; DENSE INTERSTELLAR CLOUDS; THERMAL RATE COEFFICIENT; ADIABATIC CHANNEL MODEL; CAPTURE RATE CONSTANTS; TRAJECTORY CALCULATIONS; CHEMICAL-REACTIONS; RADICAL REACTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
77
Recensione:
Indirizzi per estratti:
Citazione:
I.R. Sims et al., "ULTRALOW TEMPERATURE KINETICS OF NEUTRAL-NEUTRAL REACTIONS - THE TECHNIQUE AND RESULTS FOR THE REACTIONS CN-2 DOWN TO 13 K AND CN+NH3 DOWN TO 25 K(O)", The Journal of chemical physics, 100(6), 1994, pp. 4229-4241

Abstract

An entirely new experimental method is described which enables the rate constants of neutral-neutral gas-phase reactions to be measured at ultralow temperatures. The measurements are made by applying the pulsed laser photolysis (PLP), laser-induced fluorescence (LIF) technique of studying the kinetics of free radical reactions in the ultracold-environment provided by the gas flow in a Cinetique de Reaction en Ecoulement Supersonique Uniforme (CRESU) apparatus. The experimental method is described in some detail and its application and limitations are discussed. Results are reported for the reactions of CN radicals with O-2 and NH3. For reaction (1) between CN and O-2 data are reported for the temperature range T=13-295 K and the rate constants are well-matched by the expression k(1)(T)=(2.49+/-0.17)X10(-11) (T/298)((-0.63+/-0.04)) cm(3) molecule(-1) s(-1). For reaction (2) between CN and NH3, rate constants cm in the temperature range T=25-295 K fit the expression k(2)(T)=(2.77+/-0.67)X 10(-11) (T/298)((-1.14+/-0.15)) Cm-3 molecule(-1) s(-1). The kinetic data are discussed in terms of the latest quantum chemical and reaction rate theories for these systems.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 20:10:38