Umapathy, S. ; Mallick, B. ; Lakshmanna, A. (2010) Mode-dependent dispersion in Raman line shapes: observation and implications from ultrafast Raman loss spectroscopy The Journal of Chemical Physics, 133 (2). 024505_1-024505_6. ISSN 0021-9606
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Official URL: http://jcp.aip.org/resource/1/jcpsa6/v133/i2/p0245...
Related URL: http://dx.doi.org/10.1063/1.3464332
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.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Institute of Physics. |
Keywords: | Fluorescence; Franck-condon Factors; Raman Spectroscopy; Spectral Line Breadth; Stimulated Raman Scattering; Vibrational States |
ID Code: | 64999 |
Deposited On: | 15 Oct 2011 12:40 |
Last Modified: | 15 Oct 2011 12:40 |
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