Driving photochemistry by clustering: The ICl-Xe case
Samartzis, Peter C.
Kitsopoulos, Theofanis N.
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We present slice imaging data demonstrating the influence of clustering on the photodissociation dynamics of a diatomic molecule: iodine monochloride (ICl) was dissociated at 235 nm in He and Xe seed gasses, probing both Cl and I photofragment energy and angular distributions. We observe that the kinetic energy releases of both Cl and I fragments change from He to Xe seeding. For Cl fragments, the seeding in Xe increases the kinetic energy release of some Cl fragments with a narrow kinetic energy distribution, and leads to some fragments with rather broad statistical distribution falling off exponentially from near-zero energies up to about 2.5 eV. Iodine fragment distribution changes even more dramatically from He to Xe seeding: sharp features essentially disappear and a broad distribution arises reaching to about 2.5 eV. Both these observations are rationalized by a simple qualitative cluster model assuming ICl dissociation inside larger xenon clusters and on surface of smaller Xe sp...ecies. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4758317]
Keywords:atom-molecule collisions / dissociation energies / helium neutral atoms / iodine compounds / molecular clusters / photodissociation / statistical distributions / xenon
Source:Journal of Chemical Physics, 2012, 137, 15
- GPSDI - Gas Phase Structural Dynamics Imaging (EU-268305)
- Marie Curie Initial Training network ICONIC [PITN-GA-2009-238671], Alexander von Humboldt foundation, Grant Agency of the Czech Republic [203/09/0422]