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Proceedings of the Eighth Conference on Time-Resolved Vibrational Spectroscopy
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Frederik V. R. Neuwahl, Paolo Foggi, "Direct Observation of S2–S1 Internal Conversion in Pyrene by Femtosecond Transient Absorption", Laser Chemistry, vol. 19, Article ID 037692, 5 pages, 1999. https://doi.org/10.1155/1999/37692
Direct Observation of S2–S1 Internal Conversion in Pyrene by Femtosecond Transient Absorption
Abstract
UV pulses of 100 fs at 340 nm are utilised to excite pyrene to the vibrationally cold S2
state. Population and depopulation processes occurring in the S2 state are investigated
by transient absorption spectroscopy with a white continuum probe. In the first 400 fs
after excitation it is possible to measure the growth and disappearance of a band at
585 nm which is assigned to the S14←S2 transition. As a consequence of the internal
conversion process from S2 to S1 state, the disappearance of the 585 nm band and the
growth of the transient spectrum due to
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Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
