The rotational spectra of CF335Cl and CF337Cl in their ground vibrational states were recorded in the microwave and millimeter-wave region, and analyzed to give precise values of the B rotational constants, centrifugal distortion constants, and quadrupole coupling constants. In addition, rotational spectra for the doubly degenerate states v5 = 1 and v6 = 1 of CF335Cl were analyzed to yield values of ζ5 and ζ6. These are in good agreement with those obtained from Raman and infrared band contour analysis.
Mercury dissolution in HCl and Pb in H2SO4 have been investigated using automated equipment of new design. The characteristic electrochemical parameter curves derived from the steady-state impedance and current-potential curves are reported. The data spans the active-passive transition and the passive region. An interpretation of the data in the passive region, based on a reaction kinetic model, is discussed.
The electrode kinetics of dissolution of a smooth Pb electrode and a battery plate in 5 M H2SO4 have been measured using a new automated measurement system. The Pb dissolution reaction and H2 evolution reaction can be separated using equivalent circuit and a least squares fitting procedure of theory to experiment.
The Zn deposition from NaClO 4 and KCl solution has been investigated by an automated electrode kinetic measurement system and the data is fitted to a reaction model. A value of the standard rate is probably independent of the anion, the bulk concentration, and the real surface area of the metal.
A hardware/software system for the complete automation of electrode kinetic measurements is presented. Strong reasons for using this particular general configuration, instead of a more specific approach, are given.
The theory for radio frequency-millimetre wave double resonance for a four level system is presented and discussed with reference to the v 6 = 1 excited vibrational state of the molecule NSF3. The rf transitions are formally Δk = 3 and thus give information on the A rotational constant of this molecule.
The mm-wave spectra of 14N32SF3 in the excited vibrational states v 5 = 1 and v 6 = 1 have been recorded. Analyses of these have yielded values for the Av rotational constants and hence a better determined structure. In addition the coriolis constants ζ55 z = -0·2256 (18) and ζ66 z = 0·1569 (15) have been obtained. These have been combined with accurate measurements of the centrifugal distortion constants of the ground state, some isotopic vibrational data and ζ66 z = 0·1657 (15) for 14N34SF3 to give a good estimate of the most general valence force field.
The millimeter rotational spectra of PF3 have been recorded for all four excited fundamental vibrational states. A coriolis resonance between ν1 and ν3 results in anomalous distortion constants for these states and can be analyzed to yield |ζ13y| = 0.392. The value of ζ33c is found to be 0.4194 which does not fit the coriolis sum rule due to anharmonic resonance. Equilibrium values for the centrifugal distortion constants are determined and have been used to find the harmonic force field. All available data is used to determine some of the anharmonic force constants.
