Evidence for soliton-phonon interaction in trans-polyacetylene: temperature and frequency dependence of electron spin-lattice relaxation data

Journal Article · Thu Nov 07 04:00:00 EST 1985 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100269a022· OSTI ID:6196114

Robinson, B H; Schurr, J M; Kwiram, A L; Thomann, H; Kim, H; Morrobel-Sosa, A; Bryson, P; Dalton, L R

The temperature, frequency, and isotope dependence of the electron spin-lattice relaxation rate R1 for the paramagnetic defects in pristine trans-polyacetylene is analyzed in terms of a model in which the electron-electron dipolar interaction between spins is modulated by one-dimensional diffusion induced by phonon scattering of the mobile spins. At room temperature, this model predicts a T/sup 1/2/ temperature dependence of R1; at low temperatures, depending upon assumptions about the phonon spectrum estimates on the temperature dependence of R1 range from TS to T/sup 5/2/. The frequency dependence of R1 is theoretically predicted to be described by a omega/sup -1/2/ dependence which is found to accurately fit the experimental data obtained over the frequency range 35 MHz to 40 GHz. The interpretation of electron spin-lattice relaxation data is consistent with ENDOR, electron phase memory relaxation data, EPR line-width data, and nuclear relaxation data. The implications of this analysis are considered for various solution descriptions of the paramagnetic defect. 42 references, 8 figures.

• Research Organization: Univ. of Washington, Seattle
• OSTI ID: 6196114
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:23; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACETYLENE
ALKYNES
DATA
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
INTERACTIONS
LOW TEMPERATURE
MAGNETIC RESONANCE
MATHEMATICAL MODELS
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHONONS
POLYMERS
QUASI PARTICLES
RELAXATION
RESONANCE
SOLITONS
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
VERY LOW TEMPERATURE