Isotopically selective infrared multiphoton dissociation of 2-chloro-1,1,1-trifluoroethane: C-13 selectivity and mechanism

Citation
Ph. Ma et al., Isotopically selective infrared multiphoton dissociation of 2-chloro-1,1,1-trifluoroethane: C-13 selectivity and mechanism, APP PHYS B, 68(1), 1999, pp. 107-110
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS B-LASERS AND OPTICS
ISSN journal
0946-2171 → ACNP
Volume
68
Issue
1
Year of publication
1999
Pages
107 - 110
Database
ISI
SICI code
0946-2171(199901)68:1<107:ISIMDO>2.0.ZU;2-L
Abstract
The C-13-selective infrared multiphoton dissociation of CF3CH2Cl has been s tudied by analyzing the distribution of C-13 concentrations of the main pro ducts CF2=CHCl, CF2=CH2, CF2=CHF, C2F6, and the trace products CF3CH2CF3 an d CF3CH=CHF3. The mechanism mainly concerns the dissociation of energized C F3CH2Cl, the collisional stabilization of excited CF3CH and CF3CH2 and the recombination of the nascent radicals. Mo signifi cant radical-molecule rea ctions degrade the intrinsic C-13 dissociation selectivity. High C-13 produ ction yield and C-13 concentration can be attained at a laser fluence of 1. 6 J/cm(2). Such low fluence can be used to improve focus condition and enha nce photon utilization efficiency for practicable C-13 separation.