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- Title
Stepwise Ionization of the 2,4-Dioxybenzaldehyde and 3,4-Dimethoxypropiophenone Vapors.
- Authors
Akopyan, M. E.; Kleımenov, V. I.; Kleımenov, M. V.; Feofilov, A. G.
- Abstract
The processes of stepwise ionization of the 2,4-dioxybenzaldehyde and 3,4-dimethoxypropiophenone vapors by radiation in the range of wavelengths down to 266 nm were studied using total-current spectroscopy, mass spectrometry, and photoelectron spectroscopy. The process of two-step ionization and the resulting generation of molecular ions are dominant if the laser-radiation intensity amounts to ≈10[sup 6] W/cm². These molecular ions have appreciable (up to 1.8 eV) energy of vibrational excitation. As the laser-radiation intensity increases, progressively more pronounced fragmentation occurs owing to dissociation of molecular (and, possibly, fragmentation) ions as a result of absorption of at least a single additional photon. The processes leading to fragmentation of ions are suggested. It is found that the dissociation-ionization mechanism is important for the dimethoxypropiophenone. Dissociation with a breakage of the α bond in the carbonyl group with subsequent two-photon ionization of the fragments occurs when the S[sub 2]([sup 1]A') state of the ππ[sup *] t ype is excited.
- Subjects
IONIZATION (Atomic physics); VAPORS
- Publication
Optics & Spectroscopy, 2002, Vol 92, Issue 1, p36
- ISSN
0030-400X
- Publication type
Article
- DOI
10.1134/1.1446580