A first infrared pulse at frequency \(\nu_{1}\) interacts with vibrational states in \(S_{0}\) and a second visible pulse at \(\nu_{2}\) promotes the excited molecules to the \(S_{1}\) state from where they nuoresce. Tuning the frequency \(v_{2}\) over \(600 \mathrm{~cm}^{-1}\) allows the observatio
Relaxation of large molecules following ultrafast excitation
โ Scribed by Andras Lorincz; Frank A. Novak; Stuart A. Rice
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 283 KB
- Volume
- 111
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
Wc deruonstrdte that the ulhfast rehation obxxvcd in the excited states oflargc org.mc molecules in solution m.~y bc understood 3s the collcrent evolution of the initlally prcparcd non-stationary state. It is shown that under fcmtosccond ewtt.tIion condtttons the relaxation is dctcrmincd by the chrxtcristics of the light pulse. The analysis of a simple pumpprobe cxlxrimcnt suggests rl way of me~surinp the chracteristics of ulrrxzhort pulses. The case of fluorescence cwited by ultrafJst puke\ is also dn.dyzcd.
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Theoretical analysis of the time-dependent triplet-triplet absorption spectrum of anrhracene is cvried out in terms of the Huanp-Rhys spectral function which describes the absorption of molecules thermally equilibrated, due to fast intramolecular processes, al some effective tempera!urc r\*(r) depen