Atomic and molecular processes play an important role in laboratory and astrophysical plasmas for a wide range of conditions, and determine, in part, their electrical, transport, thermal, and radiation properties. The study of these and other plasma properties requires a knowledge of the cross sections, reaction rate coefficients, and inelastic energy transfers for a variety of collisional reactions. In this review, we provide quantitative information about the most important collision processes occurring in hy­ drogen, helium, and hydrogen-helium plasmas in the temperature range from 0. 1 eV to 20 keY. The material presented here is based on published atomic and molecular collision data, theoretical calculations, and appro­ priate extrapolation and interpolation procedures. This review gives the properties of each reaction, graphs of the cross sections and reaction rate coeffiCients, and the coefficients of analytical fits for these quantities. We present this information in a form that will enable researchers who are not experts in atomic physics to use the data easily. The authors thank their colleagues at the Princeton Plasma Physics Laboratory and in the atomic physics community who have made many useful suggestions for the selection and presentation o. f t. he material. We gratefully acknowledge the excellent technical assistance of Elizabeth Carey for the typing, and Bernie Giehl for the drafting. This work was supported in part by the U. S. Department of Energy Contract No. DE-AC02-76-CHO-3073. Princeton, USA R. K. Janev W. D. Langer September, 1987 K. Evans, Jr. , D. E.

1. Introduction.- 1.1 Previous Surveys.- 1.2 Scope of Present Survey.- 1.3 Organization of Information.- 1.4 Sources and Criteria for Selection and Evaluation of Data.- 1.5 Accuracy.- 1.6 References.- 1.7 Digitization of the Cross Sections.- 1.8 Calculation of Reaction Rate Coefficients.- 1.9 Numerical Fits to a and ????.- 1.10Example of Use of Fits.- 2. Electron Impact Collision Processes.- 2.1 Electron Collisions with H and H+.- 2.2 Electron Collisions with H2, H2+, and H3+.- 2.3 Electron Collisions with He, He+, and He2+.- 3. Proton Impact Collision Processes.- 3.1 Proton Collisions with H.- 3.2 Proton Collisions with H2 and H2+.- 3.3 Proton Collisions with He and He*.- 4. Collision Processes and Reactions of H2+ Ions.- 4.1 General Remarks.- 4.2 Collisions of H2+ with H.- 4.3 Collisions of H2+ with H2.- 4.4 Collisions of H2+ with He.- 5. Collision Processes of He+.- 5.1 General Remarks.- 5.2 Collisions of He+ with H2.- 5.3 Collisions of He+ with He.- 6. Collision Processes of He2+.- 6.1 Collisions of He2+ with H.- 6.2 Collision of He2+ with H2.- 6.3 Collisions of He2+ with He.- 7. Collision Processes of H¯.- 7.1 Electron Collisions with H¯.- 7.2 Proton Collisions with H¯.- 7.3 Collisions of H with H¯.- 8. Analytic Fits.- 8.1 Fits for ?.- 8.2 Polynomial Fits for ???? for Fixed E : Electron Reactions.- 8.3 Double Polynomial Fits for ????.- A. Oscillator Strengths, Radiative Rates, and Excitation Energies for Hydrogen and Helium.- References.