Laser-induced fluorescence spectroscopy of the ketenyl radical

被引:37
作者
Brock, LR
Mischler, B
Rohlfing, EA
Bise, RT
Neumark, DM
机构
[1] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720
[2] UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720
关键词
D O I
10.1063/1.474427
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
We report the first laser-induced fluorescence (LIF) excitation spectrum of the ketenyl radical, HCCO, which is produced by the 193 nm photolysis of ketene in a free jet expansion. A series of vibronic bands in the (B) over tilde (2) Pi-(X) over tilde (2)A '' system are observed. The LIF band positions and rotational structures are in excellent agreement with those of a recent photofragment yield (PFY) spectrum [D. L. Osborn et al., J. Chem. Phys. (to be published)] from the origin at 33 424 cm(-1) to 35 100 cm(-1). At higher energies the LIF spectrum breaks off sharply due to a rapid increase in the rate of predissociation. The lifetime of the vibrationless level of the (B) over tilde state is less than 1 ns; the estimated quantum yield of fluorescence is similar to 10(-3). (C) 1997 American Institute of Physics.
引用
收藏
页码:665 / 668
页数:4
相关论文
共 29 条
[1]  
BOULLART W, 1992, J PHYS CHEM-US, V96, P9818
[2]  
BROCK LR, IN PRESS J CHEM PHYS
[3]  
BROWN JM, 1983, ADV CHEM PHYS, V52, P117
[4]   THE SUBMILLIMETER-WAVE SPECTRUM OF THE HCCO RADICAL [J].
ENDO, Y ;
HIROTA, E .
JOURNAL OF CHEMICAL PHYSICS, 1987, 86 (08) :4319-4326
[5]   LASER-INDUCED FLUORESCENCE OF HCCO (DCCO) RADICAL FORMED IN O+C2H2(C2D2) REACTION - COMMENT [J].
HANRATTY, MA ;
NELSON, HH .
JOURNAL OF CHEMICAL PHYSICS, 1990, 92 (01) :814-815
[7]   LASER-INDUCED FLUORESCENCE OF HCCO (DCCO) RADICAL FORMED IN O+C2H2(C2D2) REACTION - REPLY [J].
INOUE, G ;
SUZUKI, M .
JOURNAL OF CHEMICAL PHYSICS, 1990, 92 (01) :815-815
[8]   LASER-INDUCED FLUORESCENCE OF HCCO (DCCO) RADICAL FORMED IN O+C2H2(C2D2) REACTION [J].
INOUE, G ;
SUZUKI, M .
JOURNAL OF CHEMICAL PHYSICS, 1986, 84 (07) :3709-3716
[9]   THE A2-PI-X2-SIGMA+ TRANSITION OF HC2 ISOLATED IN SOLID ARGON [J].
JACOX, ME ;
OLSON, WB .
JOURNAL OF CHEMICAL PHYSICS, 1987, 86 (06) :3134-3142
[10]   ABSORPTION-SPECTRUM OF THE HCCO RADICAL [J].
KRISHNAMACHARI, SLNG ;
VENKATASUBRAMANIAN, R .
PRAMANA, 1984, 23 (03) :321-325