Picosecond kinetics of p-dimethylaminobenzonitrile

Journal Article · Tue Dec 15 00:00:00 EST 1981 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.442008· OSTI ID:5951507

Huppert, D; Rand, S D; Rentzepis, P M; Barbara, P F; Struve, W S; Grabowski, Z R

The nanosecond and picosecond resolved dual fluorescences of p-dimethylaminobenzonitrile (DAB), in various solvents and glasses excited by 266 nm 20 ps FWHM laser pulses, have been investigated. Pulse-limited rise times are exhibited by the b*-state emission whose decay in turn feeds directly the risetime of a*-state emission at 440--600 nm in most solvents studied. The a*-state emission was monitored at 520--600 nm in order to eliminate contribution from the b*-state. Within the experimental resolution, the b*-state fluorescence decay times vary approximately linearly with solvent viscosity. The a*-state fluorescence decay times vary with both solvent and temperature, and may reflect either thermally assisted intersystem crossing from the solvated singlet a*-state (presumably of twisted internal charge transfer character) to a corresponding solvated triplet of slightly higher energy, or a thermally activated internal conversion of the /sup 1/TICT to the ground state.

• Research Organization: Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 5951507
• Journal Information: J. Chem. Phys.; (United States), Vol. 75:12
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANILINE
FLUORESCENCE
NITRILES
EXCITATION
GLASS
LASER RADIATION
PULSES
SOLVENTS
SPECTROSCOPY
TEMPERATURE DEPENDENCE
TIME RESOLUTION
VISCOSITY
AMINES
AROMATICS
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
LUMINESCENCE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
RADIATIONS
RESOLUTION
TIMING PROPERTIES
360603* - Materials- Properties