Picosecond laser studies of V-T processes in gases and electronic excitation transport in disordered systems

Technical Report · Mon Jun 01 04:00:00 EDT 1987

OSTI ID:6510376

Hedstrom, J F

SVL fluorescence spectroscopy was used to study intramolecular energy transfer from the 0/sup 0/ level of aniline induced by collisions with CO/sub 2/. Time-correlated photon counting was used to measure concentration dependent fluorescence depolarization for rhodamine 6G in glycerol. Fluorescence decays from these viscous solutions provide data for analyzing the three-dimensional, three-body excitation transport theory developed by Gochanour, Andersen and Fayer for disordered systems. The two-dimensional, two-body excitation theory developed by Loring and Fayer was also examined using time-resolved fluorescence depolarization techniques. The samples, made up of submonolayers of rhodamine 3B adsorbed onto optically flat fused silica yield fluorescence profiles which agree well with profiles developed from the theory for reduced surface coverages up to approx.0.4. At higher coverages, excitation trapping by rhodamine 3B aggregates truncates the depolarization process, yielding apparent reduced coverages which are appreciably lower than the true coverages.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6510376
• Report Number(s): IS-T-1255; ON: DE87010923
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
640304 -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALCOHOLS
AMINES
ANILINE
AROMATICS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBOXYLIC ACIDS
CHALCOGENIDES
COLLISIONS
DEPOLARIZATION
DYES
EMISSION SPECTROSCOPY
ENERGY TRANSFER
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
GLYCEROL
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
LASER SPECTROSCOPY
LAYERS
LUMINESCENCE
MINERALS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
QUARTZ
REAGENTS
RHODAMINES
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
SUBSTRATES