Open AccessDYNAMICS OF MULTIPHOTON IONIZATION OF ACETALDEHYDE BY UV LASER
Author(s) -
Rongshu Zhu,
Han Jingcheng,
Yao Guan,
Liu Hou-Xiang,
Li Shu-Aio,
Wu Cun-Kai
Publication year - 1987
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.36.459
Subject(s) - acetaldehyde , ionization , excited state , photodissociation , mass spectrum , ion , dissociation (chemistry) , fragmentation (computing) , atmospheric pressure laser ionization , photoionization , mass spectrometry , photochemistry , excimer laser , atomic physics , materials science , laser , molecule , chemistry , ethanol , physics , optics , organic chemistry , chromatography , computer science , operating system
In this article, we present the experimental results of mass spectroscopic study of multi-photon ionized acetaldehyde molecules in gaseous phase excited by XeCl excimer laser under the molecular beam condition. Based on the linear relations between the intensities of fragment ions and the pressure of sample gas, we show that the multiphoton ionization and fragmentation of acetaldehyde is an unimolecular reaction, this result reveals some photochemical be havior of acetaldehyde in the photolysis process by uv laser. According to the MPP mass spectrum of acetaldehyde, the variation of the intensities of the fragment ions in the MPI mass spectrum with laser power and photophysical property of its first excited single state 1(n,π*), we propose a parent dissociation-neutral fragments ionization model of MPI of acetaldehyde, with which the experimental results can be explained.