Samuel C. Wait

Azanaphthalenes: Part I. Huckel orbital calculations☆

Abstract Energy levels, wave functions and charge densities are reported for 74 azanaphthalenes. Calculations were performed using the Huckel method. Comparison of the lowest singlet-singlet transition with that calculated by the Pariser-Parr method is given for 21 compounds.

The electronic spectrum of cinnoline vapor

Abstract The lowest energy π → π ∗ transition of cinnoline has its origin at 31 542 cm−1 and has similar vibronic band separations to the analogous B2a ← Ag transition of naphthalene. Predissociation occurs preventing detailed study of the transition. The transition is assigned as an A′ ← A′ transition with the transition moment in the plane of the molecule. The sharp n → π ∗ transition has its origin at 22711 cm−1. The assignments of the temperature independent bands are reported. The n → π ∗ transition consists of a strong, prominent progression of 516-cm−1 intervals. Superimposed on the 516-cm−1 progression are several singly excited vibrations. A detailed assignment of the vibronic bands is reported.

Ionic Association in Molten AgNO3

An interpretation of the vibrational spectrum of molten silver nitrate based on normal coordinate analysis is presented. The results indicate that ion pairing may be responsible for the observed splitting of one degenerate fundamental and appearance of the infrared‐active band in the Raman spectrum. A force constant of 0.5 mdyn/A is estimated for the Ag–O interaction.

Asymmetric rotor line strengths

Abstract The prediction of line strengths of asymmetric rotors from linear equations relating J , K −1 , and K appears to be feasible at high values of J . Graphs are presented for several values of the asymmetry parameter, κ, and equations are given for the particular case of κ = − 0.7.

A Low-Temperature Raman Cell Assembly with Automatic Control

For the measurement of the Raman spectra of materials which are gaseous at ordinary temperatures, a technique widely used is that of maintaining the material at a temperature below its boiling point.