PICOSECOND LUMINESCENCE DETECTION USING TYPE-II PHASE-MATCHED FREQUENCY CONVERSION
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Publisher:Ohio State University
Frequency conversion techniques have been adapted for use in picosecond optical gating applications, in particular, the measurement of subnanosecond fluorescence profiles. The major advantages over Kerr-cell methods are the higher intrinsic signal-to-background ratio and the facility for ultraviolet fluorescence time-resolution. Direct picosecond-time-resolved measurements have been made of the temperature-dependent Stokes shift of the fluorescence spectrum of 2-amino, 7-nitrofluorene in 2-propanol. Fluorescence decay times measured at different wavelengths were found to vary by up to an order of magnitude. These findings are interpreted in terms of two independent relaxation processes in 2-propanol: solvent polarization and solvent-assisted fluorescence quenching.
Author Institution: Department of Chemistry, University of Pennsylvania
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