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U. Cross Sections for Excitation by H 2 * by Ele trons: e • H 2 *(v»0) * e • H 2 *(2po t 2p* ) C.2.8 5. Cross Sections for Dissociation of H 2 into Excited Fragments by Electron Impact: e*H 2 *e-»H* H(2p,n«3,n»U) C.2.10

Measurements are reported of the cross section for electron loss (o-0 i) and electron capture (010) for hydrogen atoms and ions traversing gases of hydrogen, helium, nitrogen, and argon. The kinetic energy of the particles was from 250 kev-1 Mev. Cross sections for electron loss were determined by measuring the attenuation of a neutral monatomic hydrogen beam in a gas cell in which a transverse electric field was present. The cross section for electron capture was measured by determining the fraction of the beam in each charge state after passing through a "thick" gas target. The fraction of the neutral component to the charge-one component is equal to the ratio of the cross sections for electron capture to electron loss. The velocity dependence of the cross section does not follow a strict power law. In hydrogen the cross section decreases approximately as v~1 0 , while for heavier target gases the velocity dependence is smaller, being v~3 J for argon at energies greater than 500 kev. The electron loss cross section has a 1/v 2 dependence for gases of hydrogen and helium and a 1/v dependence for nitrogen and argon target gases.

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22. Cross S :tiona for Formation of H Atoms in High Excited States by H* Impact on la, 1%, K, and Cm .... A.2.U 23. Excitation Cross Sections for the Reactions V Eg** H 2-H(2«,3s f 2p,3p,3, Hg, and Ha "". A.3-16 9. Dissociation Cross Sections for HD* Ions in He and 3e A.3.18 10. Dissociation Cross Sections for the Production of Past K* and Ho* fro* H 3 * in H 2 A.3.20 11. Dissociation Cross Sections for the Production of H° and H 2° fron H 3 * in H 2 A.3.22 12. Cross Sections for the Formation of Fast H* and H 2 * fron the Dissociation of H3+ in He and Re A.3.2U 13. Cross Sections for the Formation of H* H 2 + , and (H 2° • H°) fro« the Dissociation of H 3 * in Water Vapor A.3.26 Ik. Total and Partial Cross Sections for the Dissociation of HeH* in He A.3.28 1$. Total and Partial Cross Sections for the Dissociation of HeH* in Hg A.3.30 Continuations A.3.33 Electron Capture Cross Sections 1. Electron Capture Cross Sections for H~, H° and H* Passing Through Atonic Hydrogen A.U.2 2. Electron Capture Cross Sections for H* and H° Passing Through H 2 A.».» 3. Elactron Capture Cross Sections for H+ and H° Passing Through Helium A.U.6 U. Electron Capture Cross Sections for H* and H° Passing Through I 2 A.*.8 5. Electron Capture Cross Sections for H* and H° Passing Through 0 and Ofc A.U.10 6. Electron Capture Cross Sections for H* and H° Passing Through He Gas A.«.12 7. I .ectron Capture Cross Sections for H* and H° F using Through Ar A.U.iU <). Electron Capture Cross Sections for H* in H 2 0 and CHjj A.U.16 9. Electron Capture Cross Sections fbr H* in CO and CO2 Charges in H 2 and He by H* A.5. 1 * 3. Cross Sections for Production of Free Electrons in H2 end He by Protons A.5.6 k. Cross Sections for the Production of Slow H 2 and H* frosi H* and H c Impact on Hg A.5-8 5. Cross Sections for Positive Ion Production in M 2 and O2 by H* A.5-10 6. Cross Sections for Zlectron Production in »2 *nd 0 2 by H* A.5-12 T. Cross Sections for Production of n 2 * 9 S*, and H 2 * Ions by Protons in M 2 Gas A.5-1 1 * 8. Cross Sections for Production of O2*, 0* and 0 2 * Ions by Protons in Og A.5.16 9. Angular Distribution of Electrons from 300-keV Proton Impact in H 2 A.5.18 10. Angular Distribution of Electrons of Various Energies froa 300-keV Proton lapacts in H 2 A.5-20 11. Differ...