Infrared-enhanced multiphoton dissociation of iodobenzene cations |
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Authors: | Naomi B. Lev Robert C. Dunbar |
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Affiliation: | Chemistry Department, Case Western Reserve University, Cleveland, Ohio 44106, USA |
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Abstract: | When gas-phase iodobenzene cations in an ion cyclotron resonance spectrometer are irradiated simultaneously with visible 610 nm and IR 977 cm−1 photons, the visible two-photon process is enhanced by a factor of up to three. The experimental pressure and intensity dependences can be modeled using a set of rate equations for the evolution of the populations of different internal energy levels. Modeling suggests that the major mechanism for the mixed visible/IR process is the absorption of several IR photons, followed by the absorption of one visible photon which brings about dissociation: that the visible photoexcitation cross section decreases with increasing ion internal energy: that IR pumping does not compete successfully with relaxation processes near dissociation threshold: and that the IR radiative relaxation time is constant ≈ 500 ms. |
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Keywords: | To whom correspondence should be addressed |
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