Theory of resonance and threshold effects in electron-molecule collisions: The projection-operator approach

Resonance and Threshold Phenomena in Low-Energy Electron Collisions with Molecules and Clusters

“…Theoretical developments in the field of electron-molecule collisions during the past twenty-five years were covered in several reviews (Burke, 1979;Lane, 1980;Herzenberg, 1984;Kazansky and Fabrikant, 1984;Morrison, 1988;Domcke, 1991;Huo and Gianturco, 1995). Some aspects of resonance and threshold phenomena were discussed in these reviews, as well as by Sadeghpour et al (2000).…”

“…A wealth of information has been gained on the dynamics of these collisions, as documented by many reviews and books (e.g. Schulz, 1973a, b;Lane, 1980;Trajmar et al, 1983;Christophorou, 1984;Shimamura and Takayanagi, 1984;Allan, 1989;Domcke, 1991;Buckman and Clark, 1994;Crompton, 1994;Filippelli et al, 1994;Trajmar et al, 1994;Huo and Gianturco, 1995;Andersen and Bartschat, 1996;Chutjian et al, 1996;Zecca et al, 1996;Becker et al, 2000;Illenberger, 2000;Winstead and McKoy, 2000;Christophorou and Olthoff, 2001a, b;Karwacz et al, 2001a, b;Brunger and Buckman, 2002). In spite of this progress, however, the exploration of threshold phenomena in electronmolecule collisions at low energies -both in the limit of zero electron energy and in the neighborhood of onsets for vibrational excitation -has remained a major challenge for experiment and theory.…”

“…Experimentally, it is difficult to achieve the desired resolution (energy width in the meV range) and to handle electron beams at energies below about 0.1 eV. Theoretically, it is demanding to incorporate the nuclear dynamics, using descriptions which go beyond local complex potential models (Burke, 1979;Lane, 1980;Kazansky and Fabrikant, 1984;Morrison, 1988;Domcke, 1991;Huo and Gianturco, 1995;Winstead and McKoy, 2000). In this article, we shall survey some of the insight gained over the past ten years through experimental investigations and theoretical descriptions of resonance and threshold phenomena occurring in low-energy electron collisions with molecules and molecular clusters.…”

“…In the remaining part of Section I, we present a brief qualitative introduction into the field of low-energy electron-molecule collisions. Recent complementary surveys on electron collisions with molecules and clusters include several articles in journals (Hashemi et al, 1990;Domcke, 1991;Ma¨rk, 1991;Illenberger, 1992;Smith and Sˇpanel, 1994;Dunning, 1995;Chutjian et al, 1996;Ingolfsson et al, 1996;Zecca et al, 1996;Burrow et al, 1997;Field et al, 2001a;Karwacz et al, 2001a, b;Brunger and Buckman, 2002) and book chapters (Trajmar et al, 1994;Huo and Gianturco, 1995;Becker et al, 2000;Illenberger, 2000;Winstead and McKoy, 2000;Christophorou and Olthoff, 2001a,b;Hotop, 2001;Tanaka and Sueoka, 2001). …”

Theoretical vibrational-excitation cross sections and rate coefficients for electron-impact resonant collisions involving rovibrationally excited N2and NO molecules

“…[21]. The LCP approximation is derived from the more rigorous nonlocal model [22], which is presently the best available theory for the description of the resonant collisions. Comparison of the two models, however, reported for N 2 and NO in Refs.…”