Abstract
Solvent reorganization energies and local densities of Coumarin 153 (C153) in supercritical C2H6, CO2, and CHF3 (Tc=5 K) are measured using fluorescence spectroscopy. Reorganization energies are 320±70 and 770±70 cm-1 in CO2 and CHF3, respectively - nearly independent of density (0.3≤ρ/ρc≤2.1). The spectral shifts imply similar effective local densities in all three solvents. These effective densities can exceed 3-5 times the bulk density. In CO2 and CHF3, the maximum density augmentation calculated from emission shifts is ~20% greater than that calculated from excitation shifts. No such difference is found in C2H6.
Original language | English (US) |
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Pages (from-to) | 485-494 |
Number of pages | 10 |
Journal | Chemical Physics Letters |
Volume | 310 |
Issue number | 5-6 |
DOIs | |
State | Published - Sep 10 1999 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy
- Physical and Theoretical Chemistry