SPECTROSCOPY AND PHOTOCHEMISTRY OF KETENE ADSORBED TO SODIUM-CHLORIDE

被引：36

作者：

BERG, O ^{[1
]}

EWING, GE ^{[1
]}

机构：

[1] INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1991年 / 95卷 / 07期

关键词：

D O I：

10.1021/j100160a048

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：

Infrared and ultraviolet absorption spectroscopies are used to investigate the photochemistry of ketene (CH2CO) adsorbed to a film of NaCl crystallites. The vibrational spectrum of adsorbed ketene resembles that of condensed and matrix-isolated samples: transition frequencies and intensities are only slightly modified. The electronic spectrum, however, shows significant shifts and enhancements due to adsorption. Following 185-nm excitation, adsorbed ketene dissociates with near unit efficiency. Secondary reaction of methylene radicals (CH2) is complete, producing ethylene (C2H4) and carbon monoxide (CO). For 254-nm excitation the quantum yield of dissociation is < 10(-2), significantly lower than in the gas. Quenching mechanisms are discussed in light of the known dynamical properties of ketene molecules and NaCl crystals.

引用

页码：2908 / 2916

页数：9

共 58 条

[41] PICOSECOND DISSOCIATION OF KETENE - EXPERIMENTAL STATE-TO-STATE RATES AND TESTS OF STATISTICAL-THEORIES [J].