title: High-resolution discrete absorption spectrum of alpha-methallyl free radical in the vapor phase.
abstract: The alpha-methallyl free radical is formed in the flash photolysis of 3-methylbut-1-ene, and cis-pent-2-ene in the vapor phase, and then subsequent reactions have been investigated by kinetic spectroscopy and gas-liquid chromatography. The photolysis flash was of short duration and it was possible to follow the kinetics of the radicals' decay, which occurred predominantly by bimolecular recombination. The measured rate constant for the alpha-methallyl recombination was (3.5+/-0.3) x 10(10) mol(-1) ls(-1) at 295+/-2K. The absolute extinction coefficients of the alpha-methallyl radical are calculated from the optical densities of the absorption bands. Detailed analysis of related absorption bands and lifetime measurements in the original alpha-methallyl high-resolution discrete absorption spectrum image were also carried out by image processing techniques.
authors.affiliation: Department of Electronics Engineering, Yeditepe University, Istanbul 34755, Turkey. fubay@yeditepe.edu.tr
authors.forename: Fuat
authors.initials: F
authors.lastname: Bayrakçeken
authors.forename: Ziya
authors.initials: Z
authors.lastname: Telatar
authors.forename: Fikret
authors.initials: F
authors.lastname: Ari
authors.forename: Lale
authors.initials: L
authors.lastname: Tunçyürek
authors.forename: Ipek
authors.initials: I
authors.lastname: Karaaslan
authors.forename: Ali
authors.initials: A
authors.lastname: Yaman
mesh_terms: D000498:Allyl Compounds / Q000737:chemistry*; D005609:Free Radicals / Q000737:chemistry*; D005740:Gases / Q000737:chemistry*; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D013053:Spectrophotometry / Q000379:methods*; D013054:Spectrophotometry, Atomic; D013055:Spectrophotometry, Infrared; D014835:Volatilization
chemical_list: D000498:Allyl Compounds; D005609:Free Radicals; D005740:Gases