Spectral image analysis for the absorption bands of the beta-methallyl free radical in the vapor phase

Bayrakceken F., Telatar Z., Ari F., Bayrak A. B.

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, cilt.67, sa.5, ss.1276-1280, 2007 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 67 Sayı: 5
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.saa.2006.09.037
  • Dergi Adı: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1276-1280
  • Anahtar Kelimeler: high resolution electronic absorption, beta-methallyl radical, digital image analysis, image adaptation, second order decay, MERCURY-PHOTOSENSITIZED DECOMPOSITION, RESOLUTION ELECTRONIC-ABSORPTION, EXTINCTION COEFFICIENTS, DISCRETE ABSORPTION, ALPHA-CHLOROBENZYL, FLASH-PHOTOLYSIS, METHYL RADICALS, OLEFINS, CIS-BUTENE-2, BUTENE-1
  • Ankara Üniversitesi Adresli: Evet

Özet

The radicals formed in the flash photolysis of 2-methylbut-1-ene and subsequent reactions have been investigated by kinetic spectroscopy and gas liquid chromatography. Less than 10% of photo products are formed by a molecular made of fission of the excited olefin, and of the radical modes the relative probabilities of band fission, beta(C-H):beta(C-H):alpha(C-C) are 13:1.37:1. The extinction coefficients of beta-methallyl radical measured experimentally for all the absorption bands. The decay of the beta-methallyl radical was second order. The rate constant for the beta-methallyl radical recombination experimentally measured was 2.6 +/- 0.3 x 10(10) 1 mol(-1) s(-1) at 295 +/- 2 K. The spectrum image showing the absorption bands was examined by image processing techniques in order to improve the visual experience of each band by localizing to a specific region of interest. Experimental results illustrate how the exact location of absorption bands was clearly extracted from the spectral image and further improvements in the visual detection of absorption bands. (C) 2006 Elsevier B.V. All rights reserved.