Fast Stochastic Reorientations in Nematic PAA and PAP

• Authors: R. Podsiadły , J. Mayer , J.A. Janik , J. Krawczyk , T. Stanek
• Languages of publication: EN

Abstracts

EN

Incoherent quasielastic neutron scattering spectra were measured for nematic para-azoxyanisole (PAA) and para-azoxyphenetole (PAP) with the energy resolution of ca. 30 μ eV, at Dubna IBR-2 reactor. Data processing contained a careful background subtraction and the multiple scattering correction. The corrected spectra were subjected to a reorientational model fitting procedure. For PAA, a model of two convoluted reorientations - that of benzene rings coupled with the terminals and that of the whole molecule around the long molecular axis - gave a fairly good description of the quasielastic neutron scattering spectrum. For PAP, introducing a third motion - interconformational jumps in the ethoxy terminals - in addition to motions suggested for PAA, gave a good agreement with the measured quasielastic neutron scattering spectrum.

Keywords

EN

35.20.Yh; 24.50.Fq; 61.30.Eb

• Journal: Acta Physica Polonica A
• Year: 1997
• Volume: 91
• Issue: 3
• Pages: 513-518

Dates

published

1997-03

received

1996-10-22

(unknown)

1997-01-03

Contributors

author

R. Podsiadły

• Faculty of Chemistry of the Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland

author

J. Mayer

• H. Niewodniczański Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Kraków, Poland

author

J.A. Janik

• H. Niewodniczański Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Kraków, Poland

author

J. Krawczyk

• H. Niewodniczański Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Kraków, Poland

author

T. Stanek

• Faculty of Chemistry of the Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland