Journal article
Vibrational spectroscopy of structurally relaxed self-trapped excitons via excited-state resonant impulsive stimulated Raman spectroscopy
The journal of physical chemistry. B, Vol.116(35), pp.10582-10589
09/06/2012
Handle:
https://hdl.handle.net/2376/115509
PMID: 22757623
Abstract
We probe the vibrational modes of the equilibrated self-trapped exciton (STE) in the mixed-valence linear chain material [Pt(en)(2)][Pt(en)(2)Br(2)]·(ClO(4))(4) using resonantly enhanced impulsive stimulated Raman excitation of the excited electronic state. In these measurements, excitons are created by photoexcitation of the optical intervalence charge transfer band, and after a delay to allow self-trapping and equilibration, the metastable STE is impulsively excited and probed within its red-shifted absorption band. The pump-pump-probe response reveals wavepacket oscillations at a frequency of 125 cm(-1) that are assigned to a Raman-active mode of the STE having Br-Pt-Br symmetric stretching character. This frequency is shifted from the 171 cm(-1) symmetric stretch Raman frequency of the ground electronic state, and from the previously observed 110 cm(-1) wavepacket modulation that accompanies the formation of the STE from the initially excited electronic state, reflecting a new component of the structural relaxation of the exciton.
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Details
- Title
- Vibrational spectroscopy of structurally relaxed self-trapped excitons via excited-state resonant impulsive stimulated Raman spectroscopy
- Creators
- F X Morrissey - Department of Physics and Astronomy and Materials Science Program, Washington State University, Pullman, Washington 99164-2814, United StatesS L Dexheimer
- Publication Details
- The journal of physical chemistry. B, Vol.116(35), pp.10582-10589
- Academic Unit
- Physics and Astronomy, Department of
- Publisher
- United States
- Identifiers
- 99900547682501842
- Language
- English
- Resource Type
- Journal article