Stepwise photoionization of 1,2- dimethoxybenzene vapor

Processes of stepwise ionization of 1,2-dimethoxybenzene vapor by radiation in the range 295-275 nm were studied by the techniques of total current spectroscopy, mass spectrometry, electronic absorption spectroscopy, and threshold electron spectroscopy. A two-step ionization process via the first el...

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Bibliographic Details
Published inHigh energy chemistry Vol. 34; no. 5; pp. 315 - 319
Main Authors Akopyan, M. E., Kleimenov, V. I., Kleimenov, M. V., Feofilov, A. G.
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.09.2000
Subjects
Absorption spectroscopy
Ionization
Mass spectrometry
Molecular ions
Photoionization
Radiant flux density
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Summary:Processes of stepwise ionization of 1,2-dimethoxybenzene vapor by radiation in the range 295-275 nm were studied by the techniques of total current spectroscopy, mass spectrometry, electronic absorption spectroscopy, and threshold electron spectroscopy. A two-step ionization process via the first electronically excited state of the molecule yielding the molecular ion was found to prevail at an average laser radiation intensity less than 106 W/cm2. Molecular ions possess a considerable (up to 1 eV) vibrational excitation energy. As the radiation intensity increases, the progressively stronger and deeper degradation takes place via dissociation of molecular and, probably, fragment ions due to absorption of at least one additional photon.
ISSN:0018-1439
1608-3148
DOI:10.1007/BF02762685