Direct measurements of removal rates of CFCl(Ã1A″(0, 1, 0)) by simple alkenes

✍ Scribed by JoséA. Fernández; Roberto Martinez; María N. Sánchez Rayo; Fernando Castaño

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 514 KB
• Volume: 236
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)00188-a

✦ Synopsis

Direct measurements of rate constants for the collisional removal of CFCI(/~,¥~'(0, 1, 0)) by ethylene (C2H4), propene (C3H6), 1-butene (1-C4Hs), i-butene (i-C4H 8) and 1,3-butadiene (C4H 6) are reported. CFCI(,g,I,~'(0, n, 0)) was prepared by infrared multiple photon dissociation (IRMPD) of CHFCi 2 followed by tunable dye laser pumping at the transition CFCI(,A~P/'(0, 1, 0)~-X IA'(0, 1, 0)). Removal rates at threshold CO2-1aser fluence for the gases ethylene, propene, 1-butene, 1,3-butadiene and i-butene were measured to be 1.4 + 0.15, 3.7 + 0.7, 2.2 + 0.2, 4.0 + 0.8 and 4.1 + 0.4 in 10 -m] cm 3 molecule-] s-m units An upper limit of the rate constant for physical quenching of CFCI(,~) by Ar is also reported as < 1 × 10 -macm 3 molecu;e -~ s -t The rate data are compared with those for reactions of other carbenes and the appropriate Parmenter-Seaver plot is presented.