LASER PHOTOLYSIS OF ICL - A TIME-RESOLVED LMR MEASUREMENT OF CL(2P1/2) RELATIVE YIELD

被引:10
作者
MASHNIN, TS
CHERNYSHEV, AV
KRASNOPEROV, LN
机构
[1] Institute of Chemical Kinetics and Combustion
关键词
D O I
10.1016/0009-2614(93)85019-K
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Tunable dye laser-pulsed photolysis combined with time-resolved laser magnetic resonance spectroscopy was used to probe Cl atoms after photodissociation of iodine monochloride (ICl) molecules. The P-2(1/2) (F', M' = 2, 2) <-- P-2(3/2) (F'', M'' = 3, 3) transition between Zeeman sublevels of the fine structure levels of Cl atoms was used to measure the relative yield of excited chlorine atoms beta = ([Cl(P1/2)]0)-P-2/(([Cl(P3/2)]0)-P-2 + ([Cl(P1/2]0)-P-2) following ICl photolysis within the wavelength range 437 < lambda < 532 nm and at lambda = 266 nm. The maximum relative yield of excited Cl atoms (0.79 +/- 0.03) was measured at lambda = 480 +/- 0.5 nm. At lambda = 266 nm the relative yield was 0.65 +/- 0.06. These experimental data combined with measured relative yields of (Cl(P1/2)-P-2) in the dissociation from the B 3PI0+ state were used to decompose the visible absorption spectrum into two components. The extinction coefficient is represented as the sum of two Gaussian components: epsilon1max = 105.8 +/- 1 l mol-1 cm-1; epsilon2max = 63 +/- 2 l mol-1 cm-1; nu01 = 21070 +/- 13 cm-1; nu02 = 24077 +/- 27 cm-1; DELTAnu1 = 1901 +/- 18 cm-1; DELTAnu2 = 2087 +/- 49 cm-1 (1 and 2 refer to the transitions B 3PI0+ <-- X 1SIGMA0+ and 1PI <-- X 1SIGMA0+, respectively, T = 298 K). The main absorption is due to the transition B3PI0+ <-- X 1SIGMA0+.
引用
收藏
页码:105 / 109
页数:5
相关论文
共 50 条
[41]   Kinetics of processes involving excited bromine (Br* (2P1/2)) and iodine (I*(2P1/2)) atoms during broad-band IBr photolysis [J].
Boriev, I.A. .
Chemical Physics Reports, 18 (03) :451-466
[42]   Kinetics of processes involving excited bromine (Br*(2P1/2)) and iodine (I*(2P1/2)) atoms during broad-band IBr photolysis [J].
Boriev, IA .
CHEMICAL PHYSICS REPORTS, 1999, 18 (03) :451-466
[43]   Characterization of a Br(2P1/2)-CO2(1001-1000) transfer laser driven by photolysis of iodine monobromide [J].
Air Force Inst of Technology, Wright-Patterson Air Force Base, United States .
Appl Phys B, 4 (411-415)
[44]   Characterization of a Br(2P1/2)-CO2(1001-1000) transfer laser driven by photolysis of iodine monobromide [J].
Johnson, RO ;
Karis, SJ ;
Perram, GP ;
Roh, WB .
APPLIED PHYSICS B-LASERS AND OPTICS, 1998, 66 (04) :411-415
[45]   TIME-RESOLVED POPULATION MEASUREMENT WITH N2-LASER-PUMPED DYE-LASERS [J].
MIYAZAKI, K ;
FUKUDA, K .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1977, 10 (14) :1905-&
[46]   COLLISIONAL BEHAVIOR OF CL(3P5(P-2(1/2)) BY TIME-RESOLVED ATTENUATION OF ATOMIC RESONANCE RADIATION IN VACUUM UV [J].
FLETCHER, IS ;
HUSAIN, D .
CHEMICAL PHYSICS LETTERS, 1977, 49 (03) :516-519
[47]   Kinetics and mechanism of the photochemical reaction of 2,2′-dipyridyl with tryptophan in water:: Time-resolved CIDNP and laser flash photolysis study [J].
Tsentalovich, YP ;
Morozova, OB ;
Yurkovskaya, AV ;
Hore, PJ .
JOURNAL OF PHYSICAL CHEMISTRY A, 1999, 103 (27) :5362-5368
[48]   Experimental and theoretical determination of the magnetic dipole transition moment for the Br(4p5)(2P1/2←2P3/2) fine-structure transition and the quantum yield of Br(2P1/2) from the 193 nm photolysis of BrCN [J].
He, G ;
Seth, M ;
Tokue, I ;
Macdonald, RG .
JOURNAL OF CHEMICAL PHYSICS, 1999, 110 (16) :7821-7831
[49]   TIME-RESOLVED SPECTROSCOPIC BEHAVIOR OF AN H2-F2 LASER [J].
SUCHARD, SN .
BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1973, 18 (12) :1586-1586
[50]   TUNABLE LASER PHOTO-DISSOCIATION - QUANTUM YIELD OF ISTAR(2P1/2) FROM CH2I2 [J].
KOFFEND, JB ;
LEONE, SR .
CHEMICAL PHYSICS LETTERS, 1981, 81 (01) :136-141