Electron-Molecule Scattering Research Articles

Electronic and Vibrational Close-Coupling Method for Resonant Electron-Molecule Scattering.

We report the development of a vibrational-electronic convergent close-coupling method for electron-molecule scattering with an ab-initio account of the coupling between the electronic and vibrational motions. The technique has been applied to scattering on molecular hydrogen, including coupling between vibrational levels in the first 11 electronic states. Distinct resonances associated with the temporary formation of the H_{2}^{-} ion are present between 10 and 14eV for numerous transitions, including vibrational excitation of the X ^{1}Σ_{g}^{+} state, dissociation via the b ^{3}Σ_{u}^{+} state, and excitation of the B ^{1}Σ_{u}^{+} state. With both resonant and nonresonant scattering treated in a single calculation, this method is capable of providing self-consistent sets of cross sections for electron-molecule scattering in regions where the adiabatic-nuclei approximation breaks down.

反応性プラズマ中の電子衝突について:理論的側面から

反応性プラズマ中の電子衝突について:理論的側面から

Guest Comment

The Joint Symposium on Electron and Ion Swarms and Low Energy Electron Scattering, a satellite meeting of the XVII International Conference on the Physics of Electronic and Atomic Collisions (ICPEAC), was held at Bond University, Queensland in July 1991. This satellite meeting was the second occasion that two traditional ICPEAC satellites, The International Swarm Seminar series and the Electron-Molecule Scattering and Photoionisation satellite, were combined in order to bring together delegates from two largely diverse areas of low energy physics. The first such occasion was in 1985 at the time of the XIV ICPEAC at Stanford University.

Resonances in Electron-Molecule Scattering

Resonances in Electron-Molecule Scattering

Electron-Molecule Scattering in the Optical-Potential Approach: Surpassing Second Order

This work reports the first application of the many-body optical potential of Bell and Squires beyond second order for electron-molecule scattering. The optical potential is calculated in the two-particle-hole Tamm-Dancoff approximation and the scattering problem solved by use of the Schwinger variational principle. The method is applied to the well-known $^{2}\ensuremath{\Pi}_{\mathrm{g}}$ shape resonance of ${\mathrm{N}}_{2}$ near 2.3 eV, with highly satisfactory results. The importance of including target correlation and polarization in a balanced way is stressed.

Electron–Molecule Scattering

Sanborn C Brown (ed) 1980 Chichester: John Wiley xii + 196 pp price £ 14 This memorial volume for George Schulz begins with a reprint of his last review article on vibrational excitation of molecules by slow electrons, and is followed by equally good chapters from five of his friends and admirers. Schulz was the first to incontrovertibly demonstrate the existence of resonances in electron scattering, and much of the work on resonance excitation was his.

Qualitative Aspects of Resonances in Electron—Atom and Electron—Molecule Scattering, Excitation, and Reactions

A qualitative description of various types of resonant states of atoms and molecules is given. The classification is seen to be useful in explaining and discussing experimental phenomena. It is found that, as in nuclear physics, atoms and molecules exhibit both single-particle and core-excited resonant states. A general quasistationary method is presented which can be used to calculate the energies of the resonant states from intuitively selected trial functions. The Feshbach technique is used for formal justification of this method, and the relation of the quasistationary method to other published resonance calculations is discussed. Experiments are suggested to test the ideas presented.