Angular distributions of fragment ions arising from tetrahedral CH3I and isomer identification using intense laser fields

Autor:	A. J. Langley, P. Graham, X. Fang, Ravi P. Singhal, Philip F. Taday, Constantine Kosmidis, T. McCanny, S. M. Hankin, Kenneth W. D. Ledingham
Rok vydání:	2001
Předmět:	Physics Spectrometer Coulomb explosion Condensed Matter Physics Laser Mass spectrometry Diatomic molecule Atomic and Molecular Physics and Optics law.invention Ion law Mass spectrum Molecule Electrical and Electronic Engineering Atomic physics
Zdroj:	Laser and Particle Beams. 19:187-193
ISSN:	1469-803X 0263-0346
DOI:	10.1017/s0263034601192037
Popis:	Utilizing an ultraintense (1016 W cm−2) fs laser, the laser/matter interaction of the tetrahedral CH3I molecule is investigated. A mass spectrum and the angular distributions of fragment ions arising from Coulomb explosion of molecular ions, obtained with linearly polarized light, are presented. The distributions for In+ (n ≤ 7), CHm+ (m ≤ 3), Cp+ (p ≤ 4) and H+ ions are all anisotropic and maximal when the polarization lies along the spectrometer axis. The molecule hence seems to behave as a diatomic, with the fragment ions being ejected along the field direction. Also presented are mass spectra of the isomers 1- and 2-nitropropane, which are explosive species, taken for horizontal and vertical polarizations at both 375 and 750 nm. It is shown that femtosecond laser mass spectrometry (FLMS) can be used to distinguish between these two isomers through their differing dissociation patterns. Isomer identification is important for many different applications and FLMS may provide a means of achieving this for a wide range of molecules.
Databáze:	OpenAIRE
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