Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 124, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2172611
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A combination of ion imaging and vacuum ultraviolet, single-photon ionization is used to study the internal energy dependence of the photoionization cross section of isopropyl radicals produced by the 266 nm photodissociation of isopropyl iodide. The isopropyl radicals so produced have internal energies of similar to 0.3-2.0 eV. Images recorded for photoionization energies from just below the adiabatic ionization threshold at 7.37 +/- 0.02 and 8.04 eV are essentially identical both to each other and to that recorded at 9.67 eV. These results imply that the photoionization cross section is only weakly dependent on internal energy. Several factors contributing to this observation are discussed, as are the implications for the photoionization of other systems with significant internal excitation.
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