Vibrational energy relaxation and vibrational cooling of polyatomic liquids were studied with the ultrafast infrared-Raman (IR-Raman) technique. In the IR-Raman technique, a type of two-dimensional vibrational spectroscopy, a vibrational transition is pumped with a mid-infrared pulse and the instant
Redistribution of vibrational energy in naphthalene and anthracene studied in liquid solution
β Scribed by N.H. Gottfried; W. Kaiser
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 624 KB
- Volume
- 101
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The temporal build-up and the decay of vibrational excess population in the electronic ground state is investigated_ CHstretching modes are fast resonantly excited by a picosecond IR pulse and the subsequent flow of energy into several totally symmetric vibrational modes is observed by spontaneous anti-Stokes Raman scattering. Estimated occupation numbers of the monitored modes suggest that the excess energy is redistributed over the many vibrational modes within 5 to 10 ps.
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Individual Ctf-~-strctchmg modes wcrc. cxcltcd by single tunable infrared pu!scs. l'hc gcncratcd cxccs population of the rnolcculcb was monitored by subscqucnt probe pulccs usmg spontaneous anti-Stokes R~mm scat Wing. ~xpcrirnental ddta JTL' xcported on ethanol &and CHsI iu solutions of CC1 4, Very
Using a novel technique with polarization resolution the orientational relaxation of anthracene is investigated in the electronic ground state (solvents CC14, C2C14, benzene-d and acetone-d). Time constants of 13-19 ps are measured and discussed in terms of hydrodynamic models.
Picosecond resonance Raman spectra of the S 1 states of trans-stilbene and its torsionally hindered analog 2-phenylindene in solution show that the vibrational cooling times in these two systems are similar. Anti-Stokes scattering from high frequency modes is observed for the first time and provides
It Iwbeen found that fhxorescence quenchingof 9,lOdibromo-, 9,lOdichloro-and 9,1Odicyano-anthracenc by aromatic hydrocarbons is due not to singlet-triplet energy transfer but to donor-acceptor interactions leading to the formation of short-lived cscipbses. The 9,lOdics~noanthmcene cscipleses fhxorcj