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

Published online by Cambridge University Press:  18 January 2002

P. GRAHAM ,
K.W.D. LEDINGHAM ,
R.P. SINGHAL ,
S.M. HANKIN ,
T. MCCANNY ,
X. FANG ,
P.F. TADAY ,
A.J. LANGLEY  and
C. KOSMIDIS
P. GRAHAM
Affiliation:
Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland, United Kingdom
K.W.D. LEDINGHAM
Affiliation:
Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland, United Kingdom
R.P. SINGHAL
Affiliation:
Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland, United Kingdom
S.M. HANKIN
Affiliation:
Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland, United Kingdom
T. MCCANNY
Affiliation:
Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland, United Kingdom
X. FANG
Affiliation:
Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland, United Kingdom
P.F. TADAY
Affiliation:
Central Laser Facility, Rutherford Appleton Laboratory, Didcot, Oxon., OX11 0QX, England, United Kingdom
A.J. LANGLEY
Affiliation:
Central Laser Facility, Rutherford Appleton Laboratory, Didcot, Oxon., OX11 0QX, England, United Kingdom
C. KOSMIDIS
Affiliation:
Department of Physics, University of Ioannina, GR-45110, Ioannina, Greece
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Abstract

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.

Type
Research Article
Information
Laser and Particle Beams , Volume 19 , Issue 2 , April 2001 , pp. 187 - 193
Copyright
© 2001 Cambridge University Press

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