Pulsed laser photothermal spectroscopy of liquids and solids
Abstract
Published papers have compared the advantages of piezoelectric and optical detection of photoacoustic signals in sample liquids and have demonstrated the superior capabilities of thermal lens measurements on time scales as short as a few hundred nanoseconds. Computer programs were developed to compare theoretical and experimental photoacoustic pulse shapes in liquids with a view to determining triplet state quantum yields and radiationless decay lifetimes with greater accuracy. Non-radiative quantum yields of 1.0, 0.9 and 0.5 were measured for nonaqueous solutions of Crystal Violet, Evan's Blue and Nile Blue A respectively. Pulsed photothermal radiometry experiments have yielded thermal diffusivity data for a room temperature molten salt system. Microphonic photoacoustic signals obtained by illuminating solid samples with synchrotron x rays were enhanced with volatile liquids, and the results were compared with theory.
- Publication:
-
Progress Report
- Pub Date:
- September 1989
- Bibcode:
- 1989utah.rept.....E
- Keywords:
-
- Laser Spectroscopy;
- Liquids;
- Pulsed Lasers;
- Solids;
- Lenses;
- Piezoelectricity;
- Thermal Diffusion;
- Lasers and Masers