Two-photon excitation into low-energy singlet states of anthracene in mixed crystals
β Scribed by A. Bree; A. Leyderman; C. Taliani
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 411 KB
- Volume
- 118
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The twc-pholon excilaGon spslrum or the lin~ excited stare of anthracene in fluorene and biphenyl at 4 2 K has been i measured. Inlensily is induced inlo the origtn by the static dipole moment of fluorenc. and into b,, wbrons Ihrough coupltng to: an A, stale near 294IXl cm -'; Lhe nature of this A, state is dIscussed
π SIMILAR VOLUMES
The two-photon excitation spectrum of anthracene m solution IS reported from 29000 to 47000 cm-'. Two-photon alloued transitions to 1Bsa(35800 cm-'), 2Ag (38000 cm-l) and 3Aa (43000 cm-') are assgned by polanzanon measurements. These results, anth those from one-photon spectroscopy, agree with cakul
## AH-frons diphcnylhcxntrlcnc and diphcnyloctatctr~ene m solution show a very strong two-photon absorption beginning at about thu sarnc energy a~ the one-photon spectrum. This supports the postulated presence of n low-iying 'Ag clcctronic state.
Evidence for vibronic coupling involving as vibrations has been found in system I of the one-photon spectrum of anthracene. A model for b,, coupling between the low-energy electronic states can account for the magnitudes of both the pre-resonance Raman scattering and the transition dipole length ind
It has been found that fluorescence from an anthracene crystal can be modulated by an external magnetic field under strong excitation (2= 308 nm). Dependence on the magnetic field strength and its orientation with respect to the crystal axes have been measured. Magnetic field effects on the fluoresc