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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 14 — Jul. 15, 2013
  • pp: 16639–16647

Real-time observation of ultrafast internal conversion in ethylbenzene by femtosecond time-resolved photoelectron imaging

Yuzhu Liu, Thomas Gerber, Yaroslav Sych, Peter Radi, and Gregor Knopp  »View Author Affiliations

Optics Express, Vol. 21, Issue 14, pp. 16639-16647 (2013)

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The ultrafast dynamics of the second singlet electronically excited state (S2) in ethylbenzene has been studied by femtosecond time-resolved photoelectron imaging. The time evolution of the photoelectron signal can be well described by a biexponential decay: a rapid relaxation pathway with a time constant of 60 ( ± 9) fs and a longer-lived channel on a timescale of 2.58 ( ± 0.22) ps. The rapid relaxation is ascribed to the ultrafast internal conversion from the S2 state to the vibrationally hot S1 state. This internal conversion process has been observed in real time. The slow photoelectron signal reflects the depopulation of secondarily populated high vibronic S1 state.

© 2013 OSA

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(320.7120) Ultrafast optics : Ultrafast phenomena
(320.7150) Ultrafast optics : Ultrafast spectroscopy

ToC Category:
Atomic and Molecular Physics

Original Manuscript: April 8, 2013
Revised Manuscript: June 21, 2013
Manuscript Accepted: June 27, 2013
Published: July 3, 2013

Yuzhu Liu, Thomas Gerber, Yaroslav Sych, Peter Radi, and Gregor Knopp, "Real-time observation of ultrafast internal conversion in ethylbenzene by femtosecond time-resolved photoelectron imaging," Opt. Express 21, 16639-16647 (2013)

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