Beta-carotene S1 fluorescence

Sergei M. Bachilo; Tomas Gillbro

doi:10.1117/12.197418

2 January 1995 Beta-carotene S₁ fluorescence

Sergei M. Bachilo, Tomas Gillbro

Proceedings Volume 2370, 5th International Conference on Laser Applications in Life Sciences; (1995) https://doi.org/10.1117/12.197418
Event: Laser Applications in Life Sciences: 5th International Conference, 1994, Minsk, Belarus

Abstract

Using nanosecond laser excitation the (beta) -carotene S₁ emission has been detected in several solvents at room temperature and 77 K. The S₁ fluorescence spectrum was recorded in the near IR from 660 to 1250 nm. Time-resolved single photon counting with picosecond resolution confirmed the S₁ state origin of the fluorescence, and the detected fluorescence lifetime is close to the known S₁ state lifetime (about 10 ps at 293 K and 20 ps at 77 K). The S₁ emission vibrational structure in CS₂ can be interpreted with the S₁ level at 14300 cm^-1. The S₁ fluorescence quantum yield is about 25 times lower than that of the S₂ fluorescence. It is thus about 4 (DOT) 10^-6, from which the S₁ yields S₀ radiative lifetime can be calculated to be about 3 microsecond(s) .

Citation Download Citation

Sergei M. Bachilo and Tomas Gillbro "Beta-carotene S₁ fluorescence", Proc. SPIE 2370, 5th International Conference on Laser Applications in Life Sciences, (2 January 1995); https://doi.org/10.1117/12.197418

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