Photoexcitation dynamics in polyacetylene probed by transient photoinduced resonance Raman scattering

Journal Article · Mon May 18 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.3104· OSTI ID:7110275

Lanzani, G; Zheng, L X; Figari, G; Benner, R E; Vardeny, Z V ^[1]

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1. Departments of Physics and Electrical Engineering, University of Utah, Salt Lake City, Utah 84112 (United States) Instituto Di Chimica Industriale, Universita Di Genova (Italy)

We have measured photoexcitation dynamics in the picosecond time domain in fully {ital trans} and partially isomerized (CH){sub {ital x}} and (CD){sub {ital x}} films with different {ital cis}/{ital trans} content ratios, using the technique of transient photoinduced resonant Raman scattering. Following the distinctively different decay kinetics of {ital cis} and {ital trans} resonantly enhanced vibrations, we observed an intersystem crossing of photoexcitations from {ital cis} to {ital trans} segments which is dominated by a diffusion process in the {ital cis} segments, with a time constant between 24 and 215 ps depending on the {ital cis}/{ital trans} ratio.

• DOE Contract Number: FG02-89ER45409
• OSTI ID: 7110275
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 68:20; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
ELECTRONIC STRUCTURE
ENERGY-LEVEL TRANSITIONS
EXCITATION
HYDROCARBONS
ISOMERS
LASER SPECTROSCOPY
ORGANIC COMPOUNDS
PHOTO-INDUCED TRANSIENT SPECTROSCOPY
POLYACETYLENES
POLYENES
QUASI PARTICLES
RAMAN SPECTROSCOPY
RELAXATION
RESONANCE
SOLITONS
SPECTROSCOPY