Elementary Processes in Hydrogen-Helium Plasmas: Cross by Professor Ratko K. Janev, William D. Langer, Dr. Douglass E.

By Professor Ratko K. Janev, William D. Langer, Dr. Douglass E. Post Jr., Dr. Kenneth Evans Jr. (auth.)

Atomic and molecular strategies play a tremendous function in laboratory and astrophysical plasmas for a variety of stipulations, and verify, partially, their electric, shipping, thermal, and radiation houses. The learn of those and different plasma homes calls for an information of the go sections, response cost coefficients, and inelastic power transfers for quite a few collisional reactions. during this evaluate, we offer quantitative information regarding crucial collision strategies taking place in hy­ drogen, helium, and hydrogen-helium plasmas within the temperature variety from zero. 1 eV to twenty keY. the cloth offered here's according to released atomic and molecular collision info, theoretical calculations, and appro­ priate extrapolation and interpolation techniques. This evaluation supplies the homes of every response, graphs of the pass sections and response expense coeffiCients, and the coefficients of analytical suits for those amounts. We current this knowledge in a kind that may permit researchers who're now not specialists in atomic physics to take advantage of the knowledge simply. The authors thank their colleagues on the Princeton Plasma Physics Laboratory and within the atomic physics neighborhood who've made many helpful feedback for the choice and presentation o. f t. he fabric. We gratefully recognize the wonderful technical advice of Elizabeth Carey for the typing, and Bernie Giehl for the drafting. This paintings used to be supported partly by way of the U. S. division of power agreement No. DE-AC02-76-CHO-3073. Princeton, united states R. okay. Janev W. D. Langer September, 1987 okay. Evans, Jr. , D. E.

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Extra resources for Elementary Processes in Hydrogen-Helium Plasmas: Cross Sections and Reaction Rate Coefficients

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I-~ I-- ~ - en ....... " I e + H2(X ' ~g)-e + H~(2pCTU; n l A Q2'IIu)~ ~ ~ -e+H*(2p)+ H*(2s) 10 '6 108 N u ,... > b v E u 10 10 '7 9 I II -10 10 I ,, '. b '" 10 ... 5 eV. 5 eV. 5 eV. 5 HO H* 1S eV. (3) (2pou; n=3) is a group of autodissociating states over which an average performed. ,........ 10 VI E N u > b v E u 1\ 10 10 '7 9 ........ II .. I -10 -II 10 I" " 10 _I 10 10! ··· 10 2 TorE(eV) b .. 2 (2) o~~~ represents a least squares fit to the experimental data. (3) For the mean energy distribution of ejected electrons , see Sect.

5. 28 and E , the same remarks hold as -6 rI 10 11111 II 'III! II 11111 -14 10 e+H*(2s) - e +H+ + e r-- V I -...... f/) u v 109 -10 10 -II 10 _I 10 ·· · ··· ··· ·· ·· I': ,, , ··· ·· E b . / · 108 ~ "> , ,, 10 16 , ,, N E u ,, , 10 17 b , -18 10 -19 10 ' 102 Tor E(eV) 10 4 10 29 (n>2) I Cross Section and Rate Coefficient: o. 56 x 10- 6 T- 1 • 5 exp(-Sn) (1. 32 Sn Vriens and Smeets (1980) Mean Energy of Ejected Electrons: 2" 2 1 '4 Eth ~ 4n 2 , E :$ E ~ 3 2" 3 2" expected to be high for n »1.

8 eV. H Comments: (1) a1~~s (rg,L u ) in the region Eth to 40 eV have been calculated within the first Born approximation. (2) The electron energy loss and mean energies of the products are calculated on the basis of potential energy diagrams (Sect. 2). Equipartition of the dissociation energy is assumed. 54 -14 -6 10 10 -'-- -- - - -- ~ - e+ H2 (X ' 2"9)-e+ [H~(2g and ~u)+e]-e+H++H(ls)+e fI) ........ 10 16 168 It) E > v E u 1\ b - N u 16 i'- I 9 I II -10 10 J . .. '. ·· 10 '7 .. "- -18 10 ..

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