Femtosecond excited state relaxation of dye molecules in solution
β Scribed by A.M. Weiner; E.P. Ippen
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 501 KB
- Volume
- 114
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The bleaching dynamics of organic dye molecules in solution have been investigated using 70 fs pulses from a colliding pulse mode-locked ring dye Laser. In addition to ground state relaxation on a nanosecond time scale, a fast partid recovery 1s observed. For the dyes Nile blue, oxazine 720, cresyl violet and rhodamine 640, this recovery is exponential, with relaxation times in the range 190-480 fs
π SIMILAR VOLUMES
Intra-and inter-molecular relaxation of dye molecules is studied after excitation to high-lying singlet states. The intramolecular redistribution is temporally resolved for the first time and occurs in oxazine 1 with a time constant of 18Ok 20 fs. The high excess energy of 17000 cm-i leads to a high
Femtosecond time-resolved spectroscopic studies with phytochrome in its red light absorbing form (Pr) were performed. Upon excitation of Pr with 75 fs pulses at 618 nm bleaching of the Pr ground state absorption accompanied by a broad transient absorption centered near 725 nm was observed. The stimu
A new method, femtosecond time-resolved stimulated emission pumping fluorescence depletion (FS TR SEP FD), has been developed to study the vibrational relaxation of electronic excited states of molecules. Two relaxation rates of dye molecules in different solvents have been observed: (i) the intramo