title: Amplified spontaneous emission spectra from the superexciplex of coumarin 138.
abstract: In this report the dual amplified spontaneous emission (ASE) characteristics of coumarin 138 (C(138)) had been studied, under different solvent environments. The results obtained were compared with coumarin 461 (C(461)) and coumarin 450 (C(450)), which have closely related structure. The results showed that all these dyes could produce ASE from superexciplex - a new molecular species - formed only under high inversion densities, obtainable by pulsed laser excitation. We have strong indication that a superexciplex with TICT conformation is capable of producing strong ASE.
authors.affiliation: Al-Imam University, Physics Department, College of Science P.O. Box 9095, Riyadh 11623, Saudi Arabia.
authors.forename: K H
authors.initials: KH
authors.lastname: Ibnaouf
authors.forename: S
authors.initials: S
authors.lastname: Prasad
authors.forename: A S
authors.initials: AS
authors.lastname: Aldwayyan
authors.forename: Mohammad S
authors.initials: MS
authors.lastname: Alsalhi
authors.forename: V
authors.initials: V
authors.lastname: Masilamani
mesh_terms: D000042:Absorption; D000085:Acetates / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry; D003374:Coumarins / Q000737:chemistry*; D004583:Electrons; D008968:Molecular Conformation; D012997:Solvents; D013050:Spectrometry, Fluorescence
chemical_list: D000085:Acetates; D004396:Coloring Agents; D003374:Coumarins; D012997:Solvents; C007650:ethyl acetate; C030123:coumarin