Deactivation of I(2P1/2) by CH3Cl, CH2Cl2, CHCl3, CCl3F, and CCl4

✍ Scribed by Malisa S. Chiappero; Gustavo A. Argüello

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 123 KB
• Volume: 30
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(1998)30:11<799::aid-kin3>3.0.co;2-q

✦ Synopsis

Collisional deactivation of by the title compounds was investigated through 2 I( P ) 1/2 the use of the time-resolved atomic absorption of excited iodine atoms at Rate 206.2 nm. constants for atomic spin-orbit relaxation by CH 3 Cl, CH 2 Cl 2 , CHCl 3 , CCl 3 F, and CCl 4 are and Ϫ13 Ϫ13 Ϫ14 Ϫ15

3.1 Ϯ 0.3 ϫ 10 , 1.28 Ϯ 0.08 ϫ 10 , 5.7 Ϯ 0.3 ϫ 10 , 3.9 Ϯ 0.4 ϫ 10 , 2.3 Ϯ respectively, at room temperature

). The higher efficiency observed for relaxation by CH 3 Cl, CH 2 Cl 2 , and CHCl 3 reveals a contribution in the deactivation process of the first overtone corresponding to the C9H stretching of the deactivating molecule (which lies close to ) as well as the number of the Ϫ1 7603 cm contributing modes and certain molecular properties such as the dipole moment. It is believed that, for these molecules, a quasi-resonant (E-v,r,t) energy transfer mechanism operates.