Mode-dependent dispersion in Raman line shapes: observation and implications from ultrafast Raman loss spectroscopy

The Journal of Chemical Physics
S UmapathyA Lakshmanna

Abstract

Ultrafast Raman loss spectroscopy (URLS) enables one to obtain the vibrational structural information of molecular systems including fluorescent materials. URLS, a nonlinear process analog to stimulated Raman gain, involves a narrow bandwidth picosecond Raman pump pulse and a femtosecond broadband white light continuum. Under nonresonant condition, the Raman response appears as a negative (loss) signal, whereas, on resonance with the electronic transition the line shape changes from a negative to a positive through a dispersive form. The intensities observed and thus, the Franck-Condon activity (coordinate dependent), are sensitive to the wavelength of the white light corresponding to a particular Raman frequency with respect to the Raman pump pulse wavelength, i.e., there is a mode-dependent response in URLS.

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Sep 27, 2014·The Journal of Physical Chemistry. B·Anthony W ParkerMichael Towrie
Nov 4, 2011·The Journal of Chemical Physics·Xueqiong QiuSoo-Y Lee
Feb 13, 2015·FEMS Microbiology Letters·Srividya KumarSandhya S Visweswariah
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Nov 30, 2019·The Journal of Chemical Physics·Chong FangCheng Chen
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Apr 24, 2018·The Journal of Physical Chemistry. a·Syed M BilalY Adithya Lakshmanna
Sep 20, 2018·The Journal of Physical Chemistry Letters·Christopher R HallStephen R Meech

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