Atomiclike ionization and fragmentation of a series of CH{sub 3}-X (X: H, F, Cl, Br, I, and CN) by an intense femtosecond laser
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558-8585 (Japan)
Methane derivatives of CH{sub 3}-X (X: H, F, Cl, Br, I, and CN) were ionized and fragmented by an intense femtosecond laser with a 40 fs pulse at 0.8 {mu}m in intensities of 10{sup 13}-10{sup 15} W cm{sup -2}. The curves of the ionization yields of CH{sub 3}-X versus laser intensities have been found to be fitted with an atomic ionization theory (the theory of Perelomov, Popov, and Terent'ev) that has been established to reproduce experimental results well for rare gas atoms. The saturation intensities have been reproduced within a factor of 1.6 of the calculated ones. For molecules with low ionization potentials such as amines, another atomic ionization theory (the theory of Ammosov, Delone, and Krainov) reproduced the saturation intensities. The atomiclike ionization behavior of molecules indicates that the fragmentation occurs after the ionization. The fragmentation mechanisms after the ionization of some molecular ions are discussed.
- OSTI ID:
- 21024157
- Journal Information:
- Journal of Chemical Physics, Vol. 127, Issue 10; Other Information: DOI: 10.1063/1.2764078; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMINES
CYANIDES
DISSOCIATION
FRAGMENTATION
HALOGENATED ALICYCLIC HYDROCARBONS
IONIZATION POTENTIAL
LASERS
METHANE
MOLECULAR IONS
ORGANIC BROMINE COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC IODINE COMPOUNDS
PHOTOIONIZATION
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS