Yohta Nakai

Cross sections for charge transfer of hydrogen atoms and ions colliding with gaseous atoms and molecules

Analytic formulas are given for the total cross sections sigma for charge transfer collisions of hydrogen atoms and ions with gaseous atoms and molecules. The cross sections considered are sigma/sub 10/, sigma/sub 0//sub -//sub 1/, sigma/sub 1//sub -//sub 1/, sigma/sub 01/, sigma/sub -//sub 10/, and sigma/sub -//sub 11/, where the subscripts represent the initial and the final charge state of the hydrogen. The functionl forms of the formulas are modifications of the semiempirical formula for sigma/sub 10/ given by Green and McNeal. Values of adjustable parameters in the formulas have been determined by least-squares fits to a compiled set of experimental data and are given in a table. The curves given by the formulas are plotted in graphs together with the data. The root-mean-square deviation of the data from the formulas is typically about 20% except when there are large discrepancies among the measurements. Experimental data through 1982 are shown on the graphs; references through mid-1986 are listed. copyright 1987 Academic Press, Inc.

Spectral Data and Grotrian Diagrams for Highly Ionized Iron, Fe VIII-XXVI

Wavelengths, energy levels, level classifications, oscillator strengths, and atomic transition probabilities of the iron ions Fe viii to Fe xxvi are critically reviewed and tabulated. Grotrain diagrams are also presented to provide graphical overviews. The literature has been surveyed to March 1988.

Spectral data and grotrian diagrams for highly ionized titanium, Ti V–Ti XXII

Abstract Wavelengths, energy levels, level configurations, oscillator strengths, and radiative transition probabilities for the titanium ions Ti V to Ti XXII are critically reviewed and tabulated. Grotrian diagrams are also presented to provide a graphical overview.

Spectral Data for Molybdenum Ions, Mo VI–Mo XLII

Wavelengths, intensities, and classifications for the molybdenum ions Mo VI to Mo XLII are compiled. A short review of the work on each stage of ionization is included. The data are critically evaluated and the best results, in our judgement, are quoted.

Spectral Data and Grotrian Diagrams for Highly Ionized Chromium, Cr v through Cr XXIV

Wavelengths, energy levels, ionization energies, line classifications, oscillator strengths, and atomic transition probabilities for Cr v to Cr XXIV are tabulated. A short review of the line identifications and wavelength measurements is given for each stage of ionization. Grotrian diagrams are given to provide graphical overviews. The literature has been surveyed through December 1991. §

Analytic cross sections for charge transfer of hydrogen atoms and ions colliding with metal vapors

Abstract Analytic formulas are given for the total cross sections, σ, for the charge transfer in collisions of H + , H − and H with metal vapors. The cross sections considered are σ 10 , σ 0−1 , σ 1−1 , σ 01 , σ −10 , and σ −11 , where the subscripts represent the initial and the final charge state of the projectile. The functional form of the formulas is a modification of the semiempirical formula proposed by Green and McNeal for σ 10 of H + in gaseous atoms and molecules. Values of adjustable parameters in the formulas have been determined by least-squares fits to a compiled set of experimental data. The root-mean-square deviation of the data from the formula is from 7 to 34% for each type of cross section. The main cause of larger deviations is the discrepancy among the data.

Spectral data and grotrian diagrams for highly ionized nickel, Ni IX-Ni XXVIII

Abstract Wavelengths, energy levels, level classifications, oscillator strengths, and radiative transition probabilities for the nickel ions Ni IX to Ni XXVIII are critically reviewed and tabulated. Grotrian diagrams are also presented to provide graphical overviews. The literature has been surveyed to mid-1986.

Spectral Data and Grotrian Diagrams for Highly Ionized Cobalt, Co VIII through Co XXVII

Wavelengths, energy levels, level classifications, oscillator strengths, and atomic transition probabilities for the cobalt ions Co VIII to Co XXVII are tabulated. A short review is given for the wavelength measurements on each stage of ionization. Grotrian diagrams are also presented to provide graphical overviews. The literature has been surveyed to March 1990.

Radiation effect study of single-crystal austenitic stainless steel by ion channeling spectroscopy

Abstract The radiation effect on the lattice structure of single-crystal austemtic stainless steel SUS310S under He ion bombardment was studied. The He+ ions, with an energy of 1.7 MeV, were incident along the 〈100〉, 〈110〉 or 〈111〉 axes of the specimen. constituent elements induced by He ions as well as Rutherford-backscattered He ions were measured. The lattice location of the alloying and impurity atoms, and their disordering caused by the He irradiation were investigated. It was shown that aligned X-ray yields in the angular scans increase with the irradiation dose except for P atoms, and the degree of the increase depends very much on the crystallographic orientation and the constituent elements. Some of the impurity P atoms were found to be situated at the body-centered site of the fcc crystal and to be displaced from this site under He ion irradiation.

A Semiempirical Formula for Single-Electron-Capture Cross Sections of Multiply Charged Ions Colliding with H, H2 and He

A universal analytic formula is given for the total cross sections of single-electron capture by multiply-charged ions colliding with H, H2 or He. Values of constants in the formula have been determined by least-squares fit to experimental data collected from the literature. The formula is applicable to ions of almost all atomic species with charge q greater than 4 (for the H and H2 targets) or 5 (for the He target) in the energy region from about 1 to 107 eV amu-1. The root-mean-square deviation of the data from the formula is 29%. The formula shows that the cross sections are proportional to q1.07 at low energies and to q2.86 at high energies. Other trends of the cross sections that can be derived from the formula are also discussed.