Studies of solvent-solute interactions in the photophysics of laser dyes

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6970670

Casey, K G

The fluorescence lifetime of rhodamine B in the normal alcohols and normal nitriles was measured using a picosecond laser system. The lifetime-measuring technique is time-correlated single photon counting (TCSPC). Absorption and emission spectra of rhodamine B in the alcohols and nitriles have also been determined, thus allowing calculation of quantum yields, radiative, and nonradiative rates. The rotation of the dye's diethylamino groups is related to the nonradiative rate. A decreasing nonradiative rate corresponds to a greater energy barrier to rotation. Rotational relaxation times of two laser dyes (cresyl violet and oxazine-1) in polymer solution (poly(ethylene oxide) and methanol) was measured using the transient absorption spectroscopy (TAS) method. TAS is a pump-probe technique using a picosecond laser system. The pump beam optically bleaches the sample and the probe beam monitors the transient response. The effect of increasing polymer concentration is seen as an increasing rotational relaxation time.

• Research Organization: Texas Tech Univ., Lubbock, TX (USA)
• OSTI ID: 6970670
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
ALCOHOLS
AMINES
CARBOXYLIC ACIDS
DYE LASERS
DYES
ENERGY LEVELS
EXCITED STATES
FLUORESCENCE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
LASER MATERIALS
LASERS
LIFETIME
LIQUID LASERS
LUMINESCENCE
MATERIALS
NITRILES
OPTICAL PROPERTIES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REAGENTS
RELAXATION TIME
RHODAMINES
ROTATIONAL STATES