ULTRAFAST ABSORPTION-SPECTROSCOPY OF PHOTODISSOCIATED CF2BR2 - DETAILS OF THE REACTION-MECHANISM AND EVIDENCE FOR ANOMALOUSLY SLOW INTRAMOLECULAR VIBRATIONAL REDISTRIBUTION WITHIN THE CF2BR INTERMEDIATE

被引：22

作者：

GOSNELL, TR

TAYLOR, AJ

LYMAN, JL

机构：

[1] Chemical and Laser Sciences Division, MS E543, Los Alamos National Laboratory, Los Alamos

来源：

JOURNAL OF CHEMICAL PHYSICS | 1991年 / 94卷 / 09期

关键词：

D O I：

10.1063/1.460429

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：

Ultrafast time-resolved absorption spectroscopy in the hard ultraviolet has been used to investigate the photodissociation of gas-phase CF2Br2 photolyzed at 248 nm. The broadband spectra obtained in the 250-265 nm region have shown that absorption of a single photon activates a two-step sequential elimination of the molecule's two bromine atoms, leaving the product CF2 radical in the ground or first-excited vibrational state of its nu-2 bending mode. The spectra also demonstrate that direct detection of the vibrationally hot CF2Br intermediate species itself. We interpret the approximately 6 ps time scale over which the diffuse CF2Br spectrum evolves as evidence for slow intramolecular vibrational redistribution within this molecule.

引用

页码：5949 / 5953

页数：5

共 18 条

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CHOI YS, IN PRESS J CHEM PHYS

[2] PHOTOPHYSICS OF CF2(A-APPROXIMATELY B-1(1)(0,6,0)) EXCITED BY A KRF LASER AT 248 NM .2. DEACTIVATION PROCESSES BY INERT-GASES [J].