The photophysical behavior of biphenylene has been investigated employing picosecond time-resolved absorption measurements over the range 400-760 nm. The temporal behavior of the different absorption maxima suggest that the transient absorption results from two different configurations of biphenylen
Chlorophyll-a excited singlet state absorption measured in the picosecond time regime
β Scribed by John F. Shepanski; Robert W. Anderson Jr.
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 794 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The uzmstent absorbance of lo-' hi chlorophyll-a tn pyrxhne is obsened 10 and 300 ps aiter e\CltxtIon by a 7 ps, 355 nm pulse The t%o states prtmanl) responstble for the observed s1g~11 are the ground and first excited smpler state Esttmzrcs oi the excited-state population ~2 computed and used IO calculate the ekared smglet absorpuon spectrum, conslstmg of broad bxnds near 670 and 450 MI
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Resonance Raman spectra of the lowest excited triplet state of chlorophyll a are obtained in benzene and in methanol by pumping at 660 nm in the Q, band and pmbing at 460 nm which is close to the absorption maximum of the T, state. Tbe spectrum observed in polar methanol differs significantly from t