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Time-resolved velocity map ion imaging study of NH3 photodissociation
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Wells, Kym L., Perriam, Gareth and Stavros, Vasilios G. (2009) Time-resolved velocity map ion imaging study of NH3 photodissociation. Journal of Chemical Physics, Vol.130 (No.7). article no.074308. doi:10.1063/1.3072763
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Official URL: http://dx.doi.org/10.1063/1.3072763
Abstract
Following excitation of the A state nu(')(2)=4 mode in ammonia, we show how the time scale to dissociation of the N-H bond depends on the internal energy imparted to the NH2 photofragment. Using a combination of femtosecond pump/probe spectroscopy and velocity map ion imaging techniques, the time and energy resolved H-atom elimination can be directly related to the nonadiabatic nature of the photodissociation for high kinetic energy H atoms with evidence for adiabatic dynamics to dissociation giving the lowest energy H atoms. Extrapolation of the time scales for dissociation versus internal energy of the NH2 photofragment implies that dissociation to the vibrationless ground state of NH2 occurs in < 50 fs, in very good agreement with frequency resolved measurements. The anisotropy of the H fragments with the highest kinetic energies seems to also suggest that the NH2 partner fragment comes off with very low rotational excitation.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Photodissociation, Chemical kinetics, Imaging systems in chemistry | ||||
| Journal or Publication Title: | Journal of Chemical Physics | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 0021-9606 | ||||
| Official Date: | 21 February 2009 | ||||
| Dates: |
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| Volume: | Vol.130 | ||||
| Number: | No.7 | ||||
| Number of Pages: | 5 | ||||
| Page Range: | article no.074308 | ||||
| DOI: | 10.1063/1.3072763 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Royal Society (Great Britain), Engineering and Physical Sciences Research Council (EPSRC), University of Warwick | ||||
| Grant number: | EP/E011187 (EPSRC) |
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