Absorption of microwave radiation by solutions. Part 1.—Determination of electric dipole moments and relaxation times

1969 ◽  
Vol 65 (0) ◽  
pp. 2892-2899 ◽  
Author(s):  
C. W. N. Cumper ◽  
A. Melnikoff ◽  
R. F. Rossiter
Keyword(s):  
Microwave Radiation ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Relaxation Times ◽  
Electric Dipole Moments

scholarly journals Anisotrope Fluoreszenz langgestreckter Moleküle in Lösungen / The Anisotropie Fluorescence of Prolate Molecules in Solutions

1979 ◽  
Vol 34 (9) ◽  
pp. 1066-1069 ◽  
Author(s):  
A. Kawski ◽  
J. Kukielski ◽  
J. Kamiński
Keyword(s):  
Excited States ◽  
Linear Dependence ◽  
Electric Dipole ◽  
Quantum Chemical ◽  
Dipole Moments ◽  
Relaxation Times ◽  
Rotational Relaxation ◽  
Electric Dipole Moments ◽  
Transition Moments ◽  
Non Linear

Abstract Quantum chemical investigations of the electric dipole moments in the ground and excited states and also transition moments of 2,2′-p-phenylenebis (5-phenyloxazole) (POPOP) and 2,2′-p-phenylenebis (4-methvl-5-phenylaxazole) (2MPOPOP) were carried out with the PPP-CI-method. It was established that the transition moments of POPOP and 2MPOPOP are parallel to the long axis, whereas the electric dipole moments are mutually parallel and perpendicular to the long axis of these molecules. Further, the emission anisotropics r of the fluorescence of the prolate molecules POPOP. 2MPOPOP and the non-polar diphenvlenestilbene (DPS) in solvents of different viscosities η were investigated. Also for these substances the non-linear dependence of 1/r on T/η was confirmed. This deviation from the linear dependence is stipulated essentially through the length of the molecule. The effective volumes and the rotational relaxation times in different solvents of the studied molecules were determined.

THE CONFORMATIONS OF THE DIASTEREOMERIC 2,5-DIMETHYL-2,5-DIMETHOXY-3,4-DIPHENYLHEXANES

1959 ◽  
Vol 37 (7) ◽  
pp. 1132-1145 ◽  
Author(s):  
Henry Sawatzky ◽  
George K. White ◽  
George F Wright
Keyword(s):  
Carbon Tetrachloride ◽  
Experimental Determination ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Free Rotation ◽  
Electric Dipole Moments ◽  
Meso Form ◽  
The Moment ◽  
Increasing Temperature

The electric dipole moments of six possible rotamers comprising the two diastereomeric forms of 2,5-dimethyl-2,5-dimethoxy-3,4-diphenylhexane have been calculated vectorially. Comparison of these values with the experimental determination of polarization in benzene and carbon tetrachloride shows that only two of the rotamers of the dd,ll form and only one of the meso form are present in significant amount. The moment of the dd,ll diastereomer decreases with increasing temperature but that of the meso form is almost invariant. It is probable that all six central linkages in these diastereomers are hindered from free rotation.

EXPERIMENTAL DETERMINATION OF THE DIPOLE MOMENTS OF THE DEGENERATE STATES OF NH

1965 ◽  
Vol 43 (10) ◽  
pp. 1766-1775 ◽  
Author(s):  
T. A. R. Irwin ◽  
F. W. Dalby
Keyword(s):  
Experimental Determination ◽  
Electric Dipole ◽  
Atomic Hydrogen ◽  
High Field ◽  
Dipole Moments ◽  
Field Region ◽  
Hydrogen Line ◽  
Electric Dipole Moments ◽  
Degenerate States

Light from the high-field region of a Lo Surdo discharge in ammonia was focused on the slit of a stigmatic spectrograph. Spectrograms of the 3 360 and 3 240 Å bands of NH and the hydrogen line Hβ were taken simultaneously. From observations of the molecular and atomic hydrogen Stark splittings and intensities the electric dipole moments of the degenerate states of NH were determined to be μ(A3Π) = (1.31 ± 0.03), μ(c1Π) = (1.70 ± 0.07), μ (a1Δ) = 1.49 ± 0.06) Debye, where the signs of μ(c1Π.) and μ(a1Δ) are the same.

Extrapolation formulas for the determination of the electric dipole moments in solutions of polar liquids

1978 ◽  
Vol 13 (6) ◽  
pp. 640-644
Author(s):  
S. B. Bulgarevich ◽  
A. A. Polunin ◽  
O. A. Osipov ◽  
V. A. Kogan
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Electric Dipole Moments ◽  
Polar Liquids
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