[en] On September 7 and 8, 1981, a workshop was held at the Institute of Plasma Physics to review the state of the art of the study of elementary processes in hydrogen recycling in fusion reactors. The processes considered are reflection, adsorption, trapping, particle-induced emission, chemical sputtering, and diffusion in metals. The present report is the proceedings of the workshop and contains rather comprehensive reviews each on the processes considered. The workshop was held as part of the joint research program of data compilation at the Research Information Center, Institute of Plasma Physics. (author)

[en] In a wide variety of fields of science and technology, collision cross sections or reaction rates play a fundamental role. Reliable data on those quantities are needed there. To satisfy those requirements, various activities have been attempted to compile data and develop databases. The most important and most difficult part of the activity is the evaluation of the compiled data to establish a reliable database. There are no standard ways of data evaluation. The resulting recommended data are often different from each other depending on who evaluate the data. It is desirable, therefore, to evaluate the evaluated (or recommended) data. Here I will introduce three examples of such attempts of evaluation of evaluated data. They are (1) A consistency check through the relation of the total scattering cross section and the cross sections of individual processes. (2) Calculation of swarm parameters (transport coefficients) to compare with experiment. (3) Applications in practical modeling The first two examples are concerned with the cross section for electron-molecule collisions and based on my own works. The third example, taken from an activity of interstellar chemical modelling, is the evaluation of a set of chemical reaction rates. (author)

[en] A comparative study is made on three bibliographic data bases: INSPEC, ORNL - AMPIC, GAPHYOR. An on - line retrieval is carried out for searching a number of specific atomic and molecular data. Characteristics of each data base are clarified and suggestions are given for use of those data bases. (author)

[en] Cross sections for 138 processes in collisions of electrons with hydrocarbons, based on available literature sources, are critically compiled. The literature has been surveyed up to September 2000. A short comment is given for each measurement. The recommended data sets are presented in separate graphs for each process. Analytic fits to the recommended cross sections are also presented

[en] In space, atoms and molecules are often placed under the extreme conditions which are very difficult to be realized on Earth. For instance, extremely hot and dense plasmas are found in and around various stellar objects (e.g., neutron stars) on one hand and extremely cold and diffuse gases prevail in interstellar space on the other. There is so strong a magnetic field that electron clouds in atoms and molecules are distorted. The study of atomic collisions under the extreme conditions is not only helpful in understanding the astrophysical environment but also reveals new aspects of the physics of atoms and molecules. This paper is an invitation to the study. (References are not exhaustive but only provide a clue with which more details can be found.) (author)

[en] A list of papers reporting cross sections for electron-impact excitations of rotational and vibrational states of molecules is presented. The list includes both the theoretical and the experimental papers published in 1980-2000. An index by molecular species is provided at the end of the bibliography. (author)

[en] Electron-impact excitation of Ar⁷⁺ is studied theoretically with the R-matrix method. Excitation cross sections are calculated for the transitions from the ground state (3s) to the 3p, 3d, 4s, 4p and 4d excited states at the impact electron energies from threshold to 110 eV, allowing for coupling between the lowest eleven states. All the cross sections show complicated resonance structure. Differential cross sections (DCSs) are also calculated for the 3s → 3p, 3d, 4s transitions both at the resonance and at the off-resonance energies. The DCS at the off-resonance position shows dominance of backward scattering. This is examined in more detail with the calculation of forward-backward asymmetry parameter. At the resonance, DCS changes its shape. This is shown at several selected resonant peaks. The present theoretical cross sections well reproduce experimental data available for the 3s → 3p transition. (author)

[en] Total charge transfer cross sections are calculated for the collisions of Li³⁺ and Be⁴⁺ ions with H(1s) atoms in the low energy region (E lt 25 keV/amu). The perturbed-stationaly-state method in the impact parameter approximation is used with a basis set of adiabatic one-electron two-center molecular orbitals. For the Li³⁺-H system, a reasonable agreement is found between the present calculation and the recent experiment. (author)

[en] Elastic scattering of electrons from a CO₂ molecule is studied theoretically. Differential, as well as integral and momentum-transfer, cross sections are calculated at the energies 3-60 eV. The calculation is based on an ab initio electrostatic potential taken with the approximate effects of electron exchange and target polarization. The fixed-nuclei approximation is made and the coupled channel equations are solved for partial waves. The resulting cross sections are satisfactory in the energy range 10-60 eV, when compared with experimental data. The resonance structure at around 4 eV is not well reproduced by the present calculation. Detailed comparisons are also made with previous theoretical works. (Author)

[en] Distorted-wave methods in the theory of electron-impact excitation of atoms and atomic ions are reviewed. Principal methods of derivation of the distorted wave approximation are presented. Many variations of the distorted-wave methods proposed so far are compared to each other to clarify their differences. As an illustration of the applicability of the methods, numerical examples of the excitation cross section are shown and compared to experimental data or more elaborate calculations for the electron collisions with H, He and some sample species of ions. (orig.)