Results of Optical Molecule Measurements

The two methods briefly outlined above furnish direct evidence regarding the symmetry of molecules from which we can arrive at conceptions of the nuclear framework and its internal mobility. Results concerning nuclear framework only will be reported here, while molecular oscillations and rotations will be discussed in the next chapter. 

Much greater insight into nuclear framework may be gained by making use of the Kerr effect. It is often possible to tell the polarization ellipsoid of the molecule by axis ratios and position relative to the nuclear frame- 

Substance Formula 3aX10 - (61 4 6a + 6a) xm 61 X10 6a X10 6a X10 Position of the optical axes and of the electric moments, structure of the molecule 

Acetylene. C2H2 99.9 51.2 24.3 24.3 61 axis of symmetry straight molecule 

Ethyl chloride. . C2H6CI 192 66.0 50.1 75,9 1 angular molecule according 

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