Pentlehner, D. and Greil, Ch. and Dick, B. and Slenczka, Alkwin (2010) Line broadening in electronic spectra of anthracene derivatives inside superfluid helium nanodroplets. JOURNAL OF CHEMICAL PHYSICS, 133 (11): 114505. ISSN 0021-9606,
Full text not available from this repository. (Request a copy)Abstract
Electronic spectroscopy of molecules profits greatly from superfluid helium droplets serving as a gentle cryogenic matrix. Characteristic features of electronic spectra in helium droplets are a solvent shift, phonon wings, and in rare cases a splitting of zero phonon lines. For the majority of molecules investigated so far in helium droplets the vibrational fine structure in electronic spectra resembles what was observed in a supersonic jet. The electronic spectra of three methylated anthracene derivatives and one phenylated anthracene discussed in this paper reveal remarkable effects in the vibrational fine structure due to solvation in helium droplets. For all four compounds the vibrational frequencies were almost not affected by the helium environment. However, if the electronic excitation is accompanied by nuclear rearrangement, the spectra showed remarkable line broadening in helium droplets. This is the case for 2-methylanthracene and 9-phenylanthracene. The corresponding line shape was of Lorentzian type and, thus, attributed to damping of the excited system by the helium environment. According to the linewidth the damping time constant was determined to be about 0.3 ps in the case of 2-methylanthracene and 0.1 ps for 9-phenylanthracene. (C) 2010 American Institute of Physics. [doi:10.1063/1.3479583]
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | INDUCED FLUORESCENCE SPECTROSCOPY; S1 TORSIONAL POTENTIALS; JET-COOLED ANTHRACENE; INTERNAL-ROTATION; DFT CALCULATIONS; LIQUID-HELIUM; HE DROPLETS; COMPLEXES; MOLECULES; STATES; fine structure; organic compounds; solvent effects; spectral line broadening; spectral line shift; superfluid helium-3; vibrational states |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Bernhard Dick Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Alkwin Slenczka |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Jul 2020 06:58 |
| Last Modified: | 13 Jul 2020 06:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24168 |
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