Physics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confemi10l&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
Physics
Radicals And Ions
Scientific paper
Emission spectroscopy including nascent emission and laser-induced dispersed fluorescence was adopted to investigate the multiphoton photolysis mechanism of halomethanes at near-ultraviolet wavelengths in a slow flow system. In the 266 nm photolysis of the interested halomethanes (CHBr_3, CHBr_2Cl, CHBrCl_2, CH_2Br_2, CHI_3, CH_2I_2, and CH_3I), several excited species such as CH (A^2Δ, B^2Σ^-, and C^2Σ^+), atomic Br or I, and C_2 (d^3Π_g) were observed in the nascent emission spectra. Halomethylenes (CHX, X= Br, Cl, I), the reactive intermediates, were not observed in nascent emission spectra, but they can be found using laser-induced dispersed fluorescence spectroscopy following excitation of their ~A1A' '(0,v_2,0)←~X1A^'(0,0,0) transitions. Interestingly, CHBr was seen only in the photolysis of CHBr_3, whereas CHCl was only discovered when the precursor is CHBr_2Cl or CHBrCl_2. The photolysis laser power dependence and emission waveform measurements were also conducted. In addition, nascent emission spectra following the photolysis at longer near-ultraviolet wavelengths (280 nm and 355 nm) were acquired. The results show the distinctive differences between the photolysis of bromomethanes (CHBr_3, CHBr_2Cl, CHBrCl_2, and CH_2Br_2) and that of iodomethanes (CHI_3, CH_2I_2, and CH_3I). Our recent progress will be presented.
Chang Bor-Chen
Hou Guang-Yi
Liao Hsiang-Fu
Liu Chen-Nan
Yang Shi-Xing
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