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Spectral modulation observed in Chl-a by ultrafast laser spectroscopy |
Optics Express, Vol. 19, Issue 23, pp. 22480-22485 (2011)
http://dx.doi.org/10.1364/OE.19.022480
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Abstract
Broadband real-time dynamic vibronic coupling in Chl-a were experimentally studied using few cycle laser pulses of 6.8fs duration and a 128-channnel lock-in amplifier. Thanks to the extreme temporal resolution benefitting from the ultrashort laser pulse, the real-time modulation of the electronic transition energy induced by the molecular vibrations were calculated by the time dependent first moments of the bleaching band. The transition energy was found to be modulated periodically with the same frequencies of molecular vibration found in the Fourier amplitude spectrum of the difference absorbance real-time traces. This was interpreted to be due to the difference in the effective transition energy associated with the wavepacket motion induced by the equilibrium positions of potential curves between the ground state and the excited state. Using the values, Huang–Rhys factors for several vibrational modes involved in the spectral modulation at the room-temperature have been determined.
© 2011 OSA
OCIS Codes
(140.7090) Lasers and laser optics : Ultrafast lasers
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.2250) Ultrafast optics : Femtosecond phenomena
(160.1435) Materials : Biomaterials
ToC Category:
Nonlinear Materials and Spectroscopy
History
Original Manuscript: August 30, 2011
Revised Manuscript: September 22, 2011
Manuscript Accepted: September 23, 2011
Published: October 25, 2011
Virtual Issues
Nonlinear Optics (2011) Optical Materials Express
Vol. 7, Iss. 1 Virtual Journal for Biomedical Optics
Citation
Juan Du, Kazuaki Nakata, Yongliang Jiang, Eiji Tokunaga, and Takayoshi Kobayashi, "Spectral modulation observed in Chl-a by ultrafast laser spectroscopy," Opt. Express 19, 22480-22485 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-19-23-22480
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