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

Journal Article · Wed Jul 14 00:00:00 EDT 2010 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3464332· OSTI ID:21559882

Umapathy, S; Mallick, B; Lakshmanna, A ^[1]

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1. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012 (India)

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.

• OSTI ID: 21559882
• Journal Information: Journal of Chemical Physics, Vol. 133, Issue 2; Other Information: DOI: 10.1063/1.3464332; (c) 2010 American Institute of Physics; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DISPERSIONS
FLUORESCENCE
INFORMATION
LOSSES
MATERIALS
NONLINEAR PROBLEMS
PULSES
PUMPS
RAMAN EFFECT
RAMAN SPECTROSCOPY
RESONANCE
SHAPE
SIGNALS
VIBRATIONAL STATES
VISIBLE RADIATION
WAVELENGTHS
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY LEVELS
EQUIPMENT
EXCITED STATES
LASER SPECTROSCOPY
LUMINESCENCE
PHOTON EMISSION
RADIATIONS
SPECTROSCOPY