We determined experimentally two critical points in elastic electron scattering by argon where the differential cross section (DCS) attains its smallest values. The points were found to be at 68.5 • ± 0.3 • , 41.30 ± 0.02 eV and at 143.5 • ± 0.3 • , 37.30 ± 0.02 eV. Special attention was given to improve the angular resolution in order to determine the exact positions of the minima. These minima are important because they are a sensitive test of the validity of experimental procedures, and are used to verify theoretical predictions of DCS shapes and magnitudes, and of the polarization of scattered electrons. Normalized DCS were determined by measuring the angular distributions of elastically scattered electrons at incident energies of 10, 15, 20, 25, 30, 40, 50, 60, 75, 80, 90 and 100 eV in the angular range 20 • -150 • . Results are compared with the available experimental and theoretical data. In addition, integral, momentumtransfer, and viscosity cross sections were determined by numerical integration of the measured DCS extrapolated to 0 • and to 180 • .

Calculations of long-range potential wells for highly excited homonuclear and heteronuclear alkali dimers Erratum: Measurements of the electric dipole polarizabilities of the alkali halide dimers [J. Chem. Phys. 8 0, 3580 (1984)] J. Chem. Phys. 81, 2189 (1984); 10.1063/1.448196 Measurements of the electric dipole polarizabilities of the alkali halide dimers

Relative elastic scattering and excitation cross sections of cadmium, up to the first ionization potential, are obtained from spectroscopic measurements on electrons with initial energies ranging from 3.4 to 85 eV. Relative differential cross sections in the angular range of 0" to 15O'arc reponed for excitation of the S'S, (elastic),

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