Toward the Study of Astrochemical Reaction Dynamics With Ion Imaging Techniques

Details Toward the Study of Astrochemical Reaction Dynamics With Ion Imaging Techniques Toward the Study of Astrochemical Reaction Dynamics With Ion Imaging Techniques

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..855...31h&link_type=abstract

ASTROCHEMISTRY: From Laboratory Studies to Astronomical Observations. AIP Conference Proceedings, Volume 855, pp. 31-41 (2006).

Biology

Astrobiology And Astrochemistry Of The Solar System And Interplanetary Space, Chemical Reactions, Energy Disposal, And Angular Distribution, As Studied By Atomic And Molecular Beams, Diffuse Spectra, Predissociation, Photodissociation, Multiphoton Ionization And Excitation To Highly Excited States

Scientific paper

We present new results for some astrochemically relevant reaction processes obtained using reflectron velocity map ion imaging and Megapixel ion imaging techniques developed in our laboratory recently. Using reflectron multimass velocity map ion imaging, we studied the vibrationally mediated photodissociation dynamics in the ethylene cation. We simultaneously record spatially resolved images of parent C2H4+ ions as well as photofragment C2H3+ and C2H2+ ions originating in dissociation from the vibronic excitations in two distinct bands, 7f 402 and 8f 000, at roughly the same total energy. The experimental results are discussed in terms of the possible influence of the torsional excitation on competition between direct dissociation, isomerization, and radiationless transitions through conical intersections among the numerous electronic states that participate in the dissociation. In conjunction with dc slice imaging, the Megapixel ion imaging technique can improve the resolution up to ten times higher than standard video camera resolution and at very low cost. We obtained VUV nonresonant ionization and resonance enhanced multiphoton ionization (REMPI) results for the reactions of Cl with alkanes with this technique. Using REMPI detection, the product HCl (v=0, J=2) image of state-resolved crossed beam scattering results for Cl + C2H6 was acquired at a collision energy of 6.7 +/- 0.6 kcal/mol. The experimental results show strongly coupled angular and translational energy distributions revealing features of the reaction not seen in previous studies. These observations provide new insight into the dynamics of the reaction.

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