Kinetics of atomic nitrogen photofragment produced by laser photodissociation of N2O

被引:8
作者
Adams, SF [1 ]
DeJoseph, CA
Carter, CC
Miller, TA
Williamson, JM
机构
[1] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA
[2] Ohio State Univ, Dept Chem, Laser Spect Facil, Columbus, OH 43210 USA
[3] Innovat Sci Solut Inc, Dayton, OH 45440 USA
关键词
D O I
10.1021/jp0039058
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
The kinetics of ground-state atomic nitrogen photofragments produced by laser photodissociation of nitrous oxide have been investigated using two-photon LIF. A single 207 nm laser pulse was used for both N2O photolysis and N atom two-photon LIF. The dependency of the LIF signal with laser power indicated that the observed N atom fragment was produced by N2O dissociation via single-photon absorption. Effects of translational energy of the N atom fragment were detected in collisional quenching rates of the two-photon excited N atom (3p)S-4 state as observed in the decay lifetime of the induced fluorescence. The mean translational kinetic energy of the N atom fragment was determined to be 0.6 +/- 0.2 eV from the quenching data. An analysis of the Doppler broadened absorption line shape of the recoiling atomic nitrogen confirmed the mean kinetic energy and further presented a model speed distribution and anisotropy parameter that was consistent with the line shape data. The NO translational and internal energies of 0.3 +/- 0.1 eV and 0.2 +/- 0.1 eV, respectively, were also assigned by momentum and energy conservation.
引用
收藏
页码:5977 / 5983
页数:7
相关论文
共 15 条
[1]   Two-photon absorption laser-induced fluorescence of atomic nitrogen by an alternative excitation scheme [J].
Adams, SF ;
Miller, TA .
CHEMICAL PHYSICS LETTERS, 1998, 295 (04) :305-311
[2]   NATURAL LIFETIMES OF EXCITED-STATES OF NEUTRAL NITROGEN DETERMINED BY TIME-RESOLVED LASER SPECTROSCOPY [J].
BENGTSSON, GJ ;
LARSSON, J ;
SVANBERG, S ;
WANG, DD .
PHYSICAL REVIEW A, 1992, 45 (05) :2712-2715
[3]   SUB-DOPPLER LASER-INDUCED FLUORESCENCE MEASUREMENTS OF THE VELOCITY DISTRIBUTION AND ROTATIONAL ALIGNMENT OF NO PHOTOFRAGMENTS [J].
DUBS, M ;
BRUHLMANN, U ;
HUBER, JR .
JOURNAL OF CHEMICAL PHYSICS, 1986, 84 (06) :3106-3119
[4]   THE PHOTOREACTION N2O-]O(1D) + N2(1-SIGMA) AT 193 NM STUDIED BY PHOTOFRAGMENT TRANSLATIONAL SPECTROSCOPY [J].
FELDER, P ;
HAAS, BM ;
HUBER, JR .
CHEMICAL PHYSICS LETTERS, 1991, 186 (2-3) :177-182
[5]   STATE-RESOLVED PHOTODISSOCIATION OF N2O [J].
HANISCO, TF ;
KUMMEL, AC .
JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (28) :7242-7246
[6]   ABINITIO MULTIPLE ROOT OPTIMIZATION MCSCF STUDY OF THE C INFINITY V-CS EXCITATION-SPECTRA AND POTENTIAL-ENERGY SURFACES OF N2O [J].
HOPPER, DG .
JOURNAL OF CHEMICAL PHYSICS, 1984, 80 (09) :4290-4316
[7]  
Huber K. P., 1979, MOL SPECTRAAND MOL S, P8
[8]  
Mitchner M., 1973, PARTIALLY IONIZED GA
[9]  
Okabe H., 1978, Photochemistry of Small Molecules
[10]   THE DOPPLER SPECTRA OF O(1D) FROM THE PHOTODISSOCIATION OF O2, NO2, AND N2O [J].
SHAFER, N ;
TONOKURA, K ;
MATSUMI, Y ;
TASAKI, S ;
KAWASAKI, M .
JOURNAL OF CHEMICAL PHYSICS, 1991, 95 (09) :6218-6223