A spectroscopic and theoretical investigation of the proton-transfer laser. [Fisetin and 3-hydroxyflavone]
The lasing characteristics and the spectroscopy of intramolecular proton-transfer molecules were investigated in nonpolar and polar solvents. In addition, molecular orbital calculations on intramolecular proton-transfer molecules were performed. The efficient generation of coherent stimulated emission from 3-hydroxyflavone (3-HF) and fisetin, two molecules that exhibit intramolecular proton transfer was shown. Amplified spontaneous emission from 3-HF is achieved in polar aprotic and moderately protic solvents. The observed shifts of the tautomer fluorescence are attributed to hydrogen bonding interactions with the solvent. In contrast, 3-hydroxychromone does not exhibit amplified spontaneous emission in various solvents and concentrations. Picosecond transient absorption experiments reveal the existence of absorption bands overlapping the emission, which leads to high-loss terms in the gain equation.
- Research Organization:
- Florida State Univ., Tallahassee, FL (USA)
- OSTI ID:
- 5169619
- Country of Publication:
- United States
- Language:
- English
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