N2O-gas sensing in N2O-O2 and N2O-N2 gas mixtures was investigated using a gas polarographic oxygen sensor which was operated at 500°C. The sensor detected the gaseous oxygen formed by the thermal decomposition of N2O; consequently, the output of the sensor agreed well with that calculated on the basis of the assumption that N2O was fully decomposed into O2 and N2 gases.

A gas polarographic oxygen sensor using the pores of the Pt cathode as an oxygen diffusion barrier has been investigated in O2–N2 gas mixtures at 600°C. As expected, the pores of the cathode functioned as a gas diffusion barrier restricting the access of gaseous oxygen to the interface of the Pt cathode and a zirconia electrolyte; consequently, the limiting current was realized. The resulting current increased linearly with the oxygen concentration in the range of 3–25% in the ambient atmosphere when the voltage applied to the cell was held constant within a range of 0.6–2.4 V. In addition, the output current of the sensor was interpreted to be a mixed current of both an ohmic current proportional to the applied voltage and a current based on the diffusion restriction of gaseous oxygen.

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Output characteristics in an C2H5OH-N2 gas mixture of a gas polarographic oxygen sensor using a zirconia electrolyte have been investigated at 450°C. The limiting current was realized in the C2H5OH-N2 gas mixture, similar to that in H2-N2 gas mixtures. This limiting current in the C2H5OH-N2 gas mixture was caused by the fact that gaseous diffusion of ethanol through the gas diffusion hole of the sensor was a rate-determining step.

A theoretical analysis of the collisional broadening and shift of Rydberg levels:with angular momenta J 1 taking into account the anisotropy of the Rydberg-perlurber potential is presented. The symmetry of the problem is used far the calculation of the collision S matrix in a semiclassical approximation with rectilinear trajenories. The obtained expressions for the broadening and shift cross sections allow an explanation of the observed differences between the broadening and shift of the anisotropic np, nd and IIP,,~ levels in comparison with those for the spherical ns and "PI,, states