Generalised vibrational mean-square amplitudes for cyclopropane and cyclopropane-d6 are calculated using spectroscopic data, and the values at 300 °K are reported. A complete set of the Coriolis coupling coefficients for these molecules has been evaluated.
Alloys of sodium and potassium were prepared in vacuum in a specially blown pyrex glass apparatus. Several bulbs containing these alloys of different compositions have been studied at tempera tures ranging from 30° to 250°C. The compositions of these alloys have been determined by gravimetric method. The results show that for the alloys of all compositions the additivity law is obeyed both at room temperature and at higher temperatures. No evidence for the formation of the compound Na2K could be detected from the magnetic study.
A vacuum Curie balance was specially designed for the study of magnetic susceptibilities at higher temperatures. With this apparatus the magnetic study of sodium and potassium was made at different temperatures ranging from 32° to 250°C. Special attention has been paid to the preparation of the specimen. Corrections for all possible errors have been made. The results point out that the susceptibilities of the metals increase with temperature both below and above their melting points. The temperature coefficients of the susceptibility of valence electrons of the two metals are in general agreement with STONER’S theory.
The angular dependence of the ESR spectrum of Cr3+ ions in AlCl3 · 6H2O has been studied. In addition to the allowed fine structure lines some weak low field lines, identified as fine forbidden transitions, have been observed.
Potential energy constants of the G.V.F.F. type, generalised mean square amplitudes of vibration, shrinkage effect and Coriolis coupling coefficients of PClF4 molecule are evaluated from spectroscopic data. The results are discussed in relation to the structure of the molecule.