TY - JOUR
T1 - On the Determination of Transition-Moment Directions from Absorption Anisotropy Measurements
AU - Kawski, A.
AU - Gryczyński, Z.
PY - 1987/6/1
Y1 - 1987/6/1
N2 - A formula is derived for the absorption anisotropy K = (A − A⊥)/(A + 2A⊥) (where A and A⊥ are the absorbances parallel and perpendicular to the stretching direction of the polymer film, respectively) as a function of the stretch ratio, Rs, of the film and the angle φ between the absorption transition moment direction and the long axis of a prolate molecule. Employing this relation, absolute transition moment directions (the angles φ) were determined experimentally for the following compounds: 1,8-diphenyloctatetraene (DPO), 1,6-diphenylhexatriene (DPH), 1,4-diphenylbutadiene (DPB), 4-dimethylamino-4′-nitrostilbene (DNS), 4-dimethylamino-4′-chlorostilbene (DCIS) and p-terphenyl (TP). The directions were found to be along the long molecular axis in the long-wave absorption band. Small deviations of the angles obtained from φ = 0°, which were of the order of several degrees, are due to the incomplete linearity of the molecules under investigation.
AB - A formula is derived for the absorption anisotropy K = (A − A⊥)/(A + 2A⊥) (where A and A⊥ are the absorbances parallel and perpendicular to the stretching direction of the polymer film, respectively) as a function of the stretch ratio, Rs, of the film and the angle φ between the absorption transition moment direction and the long axis of a prolate molecule. Employing this relation, absolute transition moment directions (the angles φ) were determined experimentally for the following compounds: 1,8-diphenyloctatetraene (DPO), 1,6-diphenylhexatriene (DPH), 1,4-diphenylbutadiene (DPB), 4-dimethylamino-4′-nitrostilbene (DNS), 4-dimethylamino-4′-chlorostilbene (DCIS) and p-terphenyl (TP). The directions were found to be along the long molecular axis in the long-wave absorption band. Small deviations of the angles obtained from φ = 0°, which were of the order of several degrees, are due to the incomplete linearity of the molecules under investigation.
UR - http://www.scopus.com/inward/record.url?scp=0011006355&partnerID=8YFLogxK
U2 - 10.1515/zna-1987-0617
DO - 10.1515/zna-1987-0617
M3 - Article
AN - SCOPUS:0011006355
VL - 42
SP - 617
EP - 621
JO - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
JF - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
SN - 0932-0784
IS - 6
ER -