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Effects of resonant excitation, pulse duration and intensity on photoelectron imaging of a dianion
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Chatterley, Adam S., Horke, Daniel A. and Verlet, Jan R. R. (2014) Effects of resonant excitation, pulse duration and intensity on photoelectron imaging of a dianion. Physical Chemistry Chemical Physics, Volume 16 (Number 2). pp. 489-496. doi:10.1039/c3cp53235f
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Official URL: http://dx.doi.org/10.1039/C3CP53235F
Abstract
The photoelectron imaging of the indigo carmine dianion is used to demonstrate the effects of resonance excitation, pulse duration and pulse intensity on the photoelectron spectra and angular distributions of a dianion. Excitation of the S1 state leads to an aligned distribution of excited state dianions. The photoelectron angular distribution following subsequent photodetachment within a femtosecond laser pulse is primarily determined by the repulsive Coulomb barrier. Extending the timescale for photodetachment to nanoseconds leads to dramatic changes in both the spectral and angular distributions. These observations are explained in terms of statistical detachment of electrons, either from the monoanion, or from the ground state of the dianion following a number of photon cycles through the S1 ← S0 transition. At high intensity, new electron emission channels open up, leading to emission below the repulsive Coulomb barrier. This has been assigned to strong-field induced detachment and the effect of an electric field on the Coulomb barrier is discussed in terms of the photoelectron spectra and angular distributions.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Photoelectron spectroscopy, Coulomb excitation, Anions | ||||
| Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||
| Publisher: | Royal Society of Chemistry | ||||
| ISSN: | 1463-9076 | ||||
| Official Date: | 2014 | ||||
| Dates: |
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| Volume: | Volume 16 | ||||
| Number: | Number 2 | ||||
| Page Range: | pp. 489-496 | ||||
| DOI: | 10.1039/c3cp53235f | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Leverhulme Trust (LT), European Research Council (ERC) | ||||
| Grant number: | EP/D073472/1 (EPSRC) |
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