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- W2071757891 abstract "Optical emissions produced in collisions of protons and hydrogen atoms incident on nitrogen molecules were studied in the spectral region from 1200 to 6000 AA{}. Relative emission cross sections were measured in the energy range from 10 to 130 keV. The prominent features of the nitrogen spectrum below 2000 AA{} were the Lyman-$ensuremath{alpha}$ line and atomic nitrogen lines. The Lyman-Birge-Hopfield system appeared also, but it was weak. At the longer wavelengths, the $mathrm{N}_{2}^{}{}_{}{}^{+}$ first negative and the ${mathrm{N}}_{2}$ second positive systems dominated the spectrum. Relative emission cross sections for the production of the first negative bands in collisions of hydrogen atoms with nitrogen molecules were nearly constant as a function of energy, and at an energy of 40 keV the cross section was one-half as large as the cross section for proton collisions. The cross section for the second positive band due to hydrogen-atom impact was about 3 ifmmodetimeselsetexttimesfi{} ${10}^{ensuremath{-}18}$ ${mathrm{cm}}^{2}$ at 25 keV, whereas for proton impact the cross section was about 2 ifmmodetimeselsetexttimesfi{} ${10}^{ensuremath{-}19}$ ${mathrm{cm}}^{2}$ at its maximum value. The cross sections for the atomic nitrogen lines produced in hydrogen-atom impact were approximately 75% of the cross sections for the same lines produced in proton impact. Hydrogen-atom collisions had higher cross sections throughout the energy range for the production of Lyman-$ensuremath{alpha}$ emission." @default.
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- W2071757891 date "1967-12-05" @default.
- W2071757891 modified "2023-10-14" @default.
- W2071757891 title "Optical Emission Produced by Proton and Hydrogen-Atom Impact on Nitrogen" @default.
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- W2071757891 doi "https://doi.org/10.1103/physrev.164.20" @default.
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