Molecular orientation and the infrared dichroism of a chiral smectic liquid crystal in a homogeneouslyusly aligned cell at different temperatures and bias fields
Citation:
A. A. Sigarev, J. K. Vij, R.A. Lewis, M. Hird and J. W. Goodby, Molecular orientation and the infrared dichroism of a chiral smectic liquid crystal in a homogeneouslyusly aligned cell at different temperatures and bias fields, Physical Review E, 68, 3, 2003, 031707-1 - 031707-13Download Item:
Abstract:
The molecular orientation and the dichroic behavior of the vibrational bands of a homogeneously
aligned helical cell containing chiral smectic liquid crystal ~R!-~-!-1-methylheptyl 4-
(48-dodecyloxybiphenyl-4-ylcarbonyloxy!-3-fluorobenzoate are studied at various temperatures as a function
of the bias field. These temperatures correspond to the various phase states of the sample at zero field. For
those bands that exhibit significant dichroism, the field dependencies of the dichroic parameters ~the dichroic
ratio and the polarization angle of maximum absorbance! are found to be dependent on temperature, phase
state, and helical unwinding. For the SmA* and SmC a * phases, the phenyl band dichroic ratio and the corresponding
orientational order parameter are found to be almost independent of the bias field. The temperature
dependence of the orientational order for zero field is discussed by taking into account the structures of the
phases and the molecular tilt angles. The field dependencies of the phenyl band dichroic parameters for the
SmCA* and SmC g * phases yield results about the distribution of directors in the layers of their unit cells and the
state of helical unwinding. The azimuthal orientational distribution function of the carbonyl transition moments
with respect to the long molecular axis has been determined. It is found that the degrees of the polar and
quadrupolar biasing increase with decrease in temperature and the azimuthal biasing angle for the chiral
carbonyl group increases significantly with a reduction in temperature.
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Grant Number
Science Foundation Ireland (SFI)
Author's Homepage:
http://people.tcd.ie/jvijDescription:
PUBLISHED[and] Physical Review E 68, 2003, 059902-1 (E).
Author: VIJ, JAGDISH
Sponsor:
Science Foundation Ireland (SFI)Type of material:
Journal ArticleSeries/Report no:
Physical Review E68
3
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