Studies of the Kerr Effect in High Resolution Spectroscopy

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Abstract
The general theory of the Kerr effect in the region of absorption bands is described. Expressions are derived for the Kerr constants B[=(nz − nx)ω/2πcFz2] and B′[=(kz − kx)ω/2πcFz2] for symmetric top molecules at frequencies close to transitions involving levels with K ≠ 0. The application of the theory to asymmetric top molecules and the inclusion of second-order effects are discussed.Kerr spectra of the 3390 Å band of formaldehyde and of the 3821 Å band of propynal have been photographed under high resolution. The most prominent lines in these spectra are those which show predominantly first-order Stark effects. Photoelectric methods are described involving (a) a rotating quarter-wave plate and (b) a rotating polarizer; they permit the recording of the pure birefringence (B) and pure dichroism (B′) respectively.

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