Studies of Excited Iodine Atoms from Photodissociations of CH3I
Methyl iodide photolysis has drawn considerable attention over the past years as an ¡§instantaneous¡¨ pseudo-linear dissociation that may be described by a two dimensional potential energy surface. Single photon excitation in methyl iodide results in a direct rupture of the C-I bound, and the dissociation occurs in ?0.1 ps. The Ã-band photodissocation of methyl iodide yields ground state methyl radicals [CH3 X(2A2?)] and either ground state iodine atoms [(2P3/2)I¡ÝI] or spin-orbit excited iodine atoms [(2P1/2)I¡ÝI*] .
In the present work, we used the IR emission technique to study the kinetics of CH3I photolysis. The intensity of 1.315 £gm infrared fluorescence from I* (2P1/2) is detected and analyzed. We have studied the influences on I* emissions by a variety of quenchers. Their roles in additional reactions and the quenching mechanism were reported.
Advisor:Chao-ming Chiang; Chen-pin Chang; Kuo-mei Chen
School:National Sun Yat-Sen University
School Location:China - Taiwan
Source Type:Master's Thesis
Keywords:ir emission quenching i ch3i
Date of Publication:08/28/2004