Determination of the rate constants of molecular processes regulating the level of induced absorption in a laser based on an aqueous-micellar solution of rhodamine 6G with lamp pumping

Journal Article · Sun Mar 01 04:00:00 EST 1987 · Opt. Spectrosc. (Engl. Transl.); (United States)

OSTI ID:5415754

Levin, M B; Snegov, M I; Cherkasov, A S

A method of determining the average lifetime tau of the products responsible for inverse induced absorption in aqueous--micellar solutions of rhodamine 6G (R6G) on lamp pumping based on a comparison of threshold intensities of excitation (W/sub th/) in the resonators of a laser with a different Q is proposed. Using the value of tau found (0.2 ..mu..sec) and experimental data on the change in W/sub th/ with the concentration of cyclooctatetraene (COT) added to the solution the rate constant of quenching of the absorbing products by COT molecules (K/sub q/ = 2.6 x 10/sup 7/ M/sup -1/sec/sup -1/) was determined. In the assumption that the absorbing products are triplet dye molecules, the value of the rate constant of interconversion (K/sub 32/) of R6G into an aqueous--micellar solution (K/sub 32/ = 1.3 x 10/sup 7/ sec/sup -1/) was determined. A comparison was made of the values of the constants found with the corresponding values known from the literature.

• Research Organization: Fondazione Ugo Bordoni, Via B. Castiglione 59, 00142 Roma, Italy
• OSTI ID: 5415754
• Journal Information: Opt. Spectrosc. (Engl. Transl.); (United States), Journal Name: Opt. Spectrosc. (Engl. Transl.); (United States) Vol. 62:3; ISSN OPSUA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ABSORPTION
AMINES
AQUEOUS SOLUTIONS
CARBOXYLIC ACIDS
DISPERSIONS
DYE LASERS
DYES
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
KINETICS
LASERS
LIQUID LASERS
MICELLAR SYSTEMS
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
REAGENTS
RHODAMINES
SOLUTIONS