Differential cross sections of electrons elastically (vibrationally) scattered from N2 have been measured by a crossed-beam method. Energy and angular range of the measurements are 1.5 to 400 eV and -96' to + 156, respectively, with an emphasis on the mg shape-resonance region. The wide energy range of the measurements provides the basis for intercomparison of a large suite of similar measurements. The comparison shows generally good to excellent agreement. The comparison with theoretical calculations is less satisfactory with significant differences in the magnitudes of the cross sections and only fair agreement in shape. In the mg shape-resonance region, the elastic cross sections appear to be one-half of the total cross sections, approximately. Inelastic cross sections, mainly vibrational excitations, would thus appear to have a magnitude near that of the elastic cross section suggesting the importance of an independent measurement of vibrational-excitation cross sections in the region of the mg resonance.

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Differential elastic (vibrationally) scattering cross sections of CH, by electron impact have been measured using a modulated crossed-beam method. The energy and angular range covered were from 5 to 50 eV and from 12 to 156", respectively. The integrated and momentum transfer cross sections were obtained from the differential cross sections. The present results are compared with the earlier data of Tanaka er a / and with theoretical results of Lima et a1 and Jain and Thompson. Some discrepancies were found in the measurements and theoretical results.

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Abslract. The vibrational excitation c m s sections of methane (ground state) have been measured by electron impact. A crossed-beam method was used. The incident energies used were 5.0, 7.5, 10.0 and 15 eV and the angular range covered was from 24'10 156'at 12" intervals. The present results were compared with previous measurements by Tanaka el 01 and some considerable discrepancies were found.

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