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Please use this identifier to cite or link to this item: http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/14073
Title: Edge excitation red shift and energy migration in quinine bisulphate dication
Authors: Pant, Debi D.
Keywords: Physics
Quinine sulphate dication
EERS
Energy migration
Issue Date: Jan-2006
Publisher: Elsevier
Abstract: Photoinduced excited state dynamical processes in quinine sulphate dication (QSD) have been studied over a wide range of solute concentrations using steady state and nanosecond time-resolved fluorescence spectroscopic techniques. The edge excitation red shift (EERS) of emission maximum, emission wavelength dependence of fluorescence lifetimes and the time dependence of emission maximum are known to occur due to the solvent relaxation process. With increase in solute concentration, the emission spectrum shifts towards the lower frequencies accompanied with decrease in fluorescence intensity, however, absorption spectrum remains unchanged. A decrease in EERS, fluorescence lifetimes, time dependent fluorescence Stokes shift (TDFSS), fluorescence polarization and the solvent relaxation time (τr) is observed with the increase in solute concentration. The process of energy migration among the QSD ions along with solvent relaxation has been found responsible for the above experimental findings.
URI: https://www.sciencedirect.com/science/article/pii/S1010603005002868
http://dspace.bits-pilani.ac.in:8080/jspui/xmlui/handle/123456789/14073
Appears in Collections:Department of Physics

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