title: Characterization of hemicyanine Langmuir-Blodgett films by picosecond time-resolved fluorescence.
abstract: Hemicyanine Langmuir-Blodgett films have been elaborated and characterized using stationary and time-resolved spectroscopic techniques. Depending on the experimental conditions, especially the pH of the water subphase, the absorption spectra of the films indicate the presence of non-fluorescent H-aggregates in the monolayer. Time-resolved fluorescence measurements revealed three mono-exponential decay times: a very short one (20-23 ps) attributed to an excited intramolecular charge transfer state and two longer ones (100-120 ps and 400-590 ps) attributed to the photoisomerization of the chromophores.
authors.affiliation: Centre de Physique Moléculaire Optique et Hertzienne, UMR 5798, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France. em.abraham@cpmoh.u-bordeaux1.fr
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Abraham
authors.forename: Christine
authors.initials: C
authors.lastname: Grauby-Heywang
authors.forename: Sophia
authors.initials: S
authors.lastname: Selector
authors.forename: Gediminas
authors.initials: G
authors.lastname: Jonusauskas
mesh_terms: D002232:Carbocyanines / Q000737:chemistry* / Q000528:radiation effects; D002725:Chloroform; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007536:Isomerism; D007700:Kinetics; D010777:Photochemistry; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry
chemical_list: D002232:Carbocyanines; D005456:Fluorescent Dyes; D002725:Chloroform