Calculations of the photodetachment ross section of F-2 in the 3σu channel are reorted in both the static-exchange and the first Born approximations. A high-energy resonance feature is found in the static-exchange result, which is evidently not associated with tunneling through an angular momentum barrier. The behavior of this feature with varying in ternuclear distance is explored, and the possible effects of channel coupling on this resonance are discussed.

Theoretical studies of low-energy electron-silane scattering are reported in whichtarget polarization is included by using an ab intion optical potential. These calculations employ the complex Kohn scattering method and were underkaken both at the static-exchange level and with target polarizatin. Aploarized wirtual-orbital method, which was introduced in our earlier study of electron-methane scattering, was also employedin this study co generate a compact description of the closed channels included in the optical potential. Differential, integral, and momentum-transfer cross sections a Ramsaurer-Townsend minimum at 0.3eV and a broad d-wave shape resonance at 3.0eV. Excellent agreement is found between our polarized Kohn results and the recent experimental resultsof Wan, Moore, and Tosssel[J. Chem. Phys. 91, 7340 (1989)].

We have carried out a comprehensive theoretical and experimental study of electrom scattering from molecular nitrogen at energies below 10.0eV. In the theoretical component of thisproject we have generated differential and interal cross sections for elastic scattering and vibrational excitation in converged vibrational close-coupling calculations. In the experiments, we have measured differential cross sections for these processes at scattering angles from 20℃ to 130℃ in a crossed-beam experiment at a large number of energies between 0.55 and 10eV and, in a complementary time-of-flight experiment, total cross sections at energies between 0.08 and 10.0eV. The measured angular distributins have been extrapolated to 0℃ and 180℃ using a procedure based on a nonlinear least-squares fit constrained by known physical properties of the e-N2 scattering matrix; numerical integration of the resulting extragpolated distributions yields integrated cross sections with almost no error beyond that inherent in themeasured an gular data. We find generally good agreement between the present expermental and theoretical cross section, particularly at energies near the IIg resonance near 2.39eV. In previous studies of scattering in this region, such comparisons have been made problematiocal by the difficulty of ascertaining the appropriate theoretical scattering energy. We recommend here a protocol for resolving this problem for both elastic scattering and vibrational excitation.

The calculation of electron-molecule cross sections at scattering energies well below 0.1 eV using conventional algorithms for solving the Schr

An unusual resonance feature of the photodetachment cross-section for the 3σu channel of F-2 observed in the early static-exchange study is confirmed by using correlated target (F2) wavefunctions determined by configuration interaction (C1). The magnitude of the cross-sections is lowered from that in earlier calculation by the potential of the correlated sarget.