Time-resolved emission spectra of coumarin 153 in (a) acetonitrile and (b) methanol. Their lognormal fitted curves for the 0 fs and 200 ps spectra are shown in the lower panel.
(a) Second moments of the time-resolved emission spectra of coumarin 153 in acetonitrile (filled square), methanol (filled triangle), and butanol (empty square). (b) The asymmetry parameter from the lognormal fits for methanol. Inset shows data out to 100 ps.
Spectral parameters—center frequency (in , square), width (in , triangle), and asymmetry (circle)—for the TRF spectra of coumarin 153 in butanol.
Center frequency (first moment) vs time (solid line) for coumarin 153 in butanol, and the fluorescence time profile (dashed line) in acetonitrile detected at 490 nm are shown in the bottom panel. The oscillation spectrum obtained from the LPSVD analysis is shown in the top panel.
(a) Solvation response function for coumarin 153 in acetonitrile (filled square), methanol (filled triangle), and butanol (empty square) up to 1 ps. (b) Solvation response excluding the oscillatory part.
First moment , width , and Stokes shift [spectra at 200 ps (or 500 ps for butanol) were regarded as the fully relaxed ] of time-zero fluorescence spectrum.
The oscillatory components of fluorescence time profile of C153 in acetonitrile at 490 nm.
Normal mode frequencies at equilibrium geometries in the ground and the excited states of C153, normal mode projected displacements , and reorganization energies .
Multiexponential parameters of fitted with the function in the form of . In the fitting, frequencies of the damped sinusoids are fixed to the LPSVD result shown in Table II.
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