The Degree of Depolarization

For definite results it is useful to work with molecules having axial symmetry because they have only two main polarization directions— parallel and vertical to the axis. These two may, however, be calculated satisfactorily on the one hand from the average polarizability a determined from the refractive index (see p. 25) and from the degree of depolarization A so that two equations are available for the two unknowns. 

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Similar results were obtained by De Shazer using a different detection technique, where laser oscillations in the sample were forced to develop from the narrow-band radiation, injected from a second small aperture laser into the sample laser cavity. The interionic transfer allowed the feeding of this narrow-band radiation by ions having frequencies outside this interval. The effeciency of energy extraction within the narrow bandwidth and the degree of depolarization of the laser oscillations parametrize the cross relaxation effects. 

Agonists Induce Higher Force Than Expected from the Degree of Depolarization... 

Because the magnitude of cr depends on the degree of depolarization, the permeability increase is voltage-dependent. Also, when the inward sodium flux decreases and the membrane potential starts to return to resting conditions, the resultant shift causes the channel to close and the ion permeability... 

Similar results have been obtained with ethers and ketones, to which Stuart has applied the Kerr constant and the degree of depolarization with great success, for elucidating experimentally the question of the shape of these molecules. In diethyl ether the preferred position is denoted by I in Fig. 12 around this slow torsional vibrations of large amplitude take place, hence it is possible that other stable systems exist besides that... 

By polarizing the incident light or in other ways, it is possible to find the degree of depolarization of each frequency shift in the Raman spectrum, a quantity which will be important in the interpretation of the experimental results. This quantity is the ratio, for the scattered light, of the intensities of the components polarized perpendicular and parallel, respectively, to the direction of polarization of the incident illumination. 

The depolarization ratio of a Raman line depends on the symmetry of the molecular vibration involved (i.e., the change in molecular symmetry induced by the corresponding vibration) the maximum value of depolarization observed with linearly polarized light is p[" = 3/4. If a Raman line shows this extent of depolarization, it is said to be depolarized, whereas, if the degree of depolarization is smaller, the line is polarized. It can be shown [3] that only Raman lines corresponding to totally symmetric vibrations can have a degree of depolarization smaller than the maximum value, that is, can be polarized. 

Ghiggino and coworkers [65] have presented a very good review of both steady state and time-resolved depolarization measurements. They have pointed out that the emission anisotropy of a sample, r, is more useful than the degree of depolarization. Here... 

In studies of the Raman effect, the degree of polarization of the Raman lines is usually measured this information often aids in assigning the observed frequencies to particular modes of vibration of the molecule. If the incident hght is traveling in the —y direction and the scattered light is observed in the x direction, then, if the incident light was polarized in the z direction, the degree of depolarization is defined... 

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