High-resolution discrete absorption spectrum of alpha-methallyl free radical in the vapor phase

Bayrakceken F., Telatar Z., Ari F., Tuncyurek L., Karaaslan I., Yaman A.

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, cilt.65, sa.1, ss.143-146, 2006 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 65 Sayı: 1
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.saa.2005.09.038
  • Dergi Adı: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.143-146
  • Anahtar Kelimeler: free radical, flash spectroscopy, lifetimes, alpha-methallyl radical, high-resolution absorption spectra, EXTINCTION COEFFICIENTS, ELECTRONIC SPECTRA, FLASH-PHOTOLYSIS, CHLOROBENZYL, BENZYL
  • Ankara Üniversitesi Adresli: Evet

Özet

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.)l s(-1) at 295 +/- 2 K. The absolute extinction coefficients of the a-methallyl radical are calculated from the optical densities of the absorption bands. Detailed analysis of related absorption bands and lifetime measurements in the original a-methallyl high-resolution discrete absorption spectrum image were also carried out by image processing techniques. (c) 2005 Elsevier B.V. All rights reserved.