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• W1617811586 abstract "The generation of hydrogen negative ions in hydrogen discharges is due to a combination of electronic excitation and wall relaxation processes. Principal processes are energetic electron excitation to form H 2(v″), followed by low-energy electron dissociative attachment to form H - +H. Wall recombination of H 2 +, H 3 + ions are also a source of H 2(v″). We consider the formation of H 2(v″) and H - by H 2 + and H 3 + ions incident upon metal surfaces.1 A four-step model for incident H 2 + (v)recombination and dissociation proceeds via: (1) Electric dissociation of high v ions in the image field ultimately producing atomic dissociation fragments; (2) resonant capture to form H 2(b 3 Σu) and H 2(X 1 Σg, v ″), with b dominant over X in ratio 69:31; (3) Auger relaxation of b to X to contribute to the H 2(X 1 Σg, v″), yield; (4) H 2(v “) drift to surface to experience ”hard“ nuclear collision and form final population distribution, H 2(v″), and final dissociation products.1 Experimental H 2/H yields are consistent with four-step ratio, not consistent with single-step singlet-model ratio, and imply rapid Auger relaxation following b-state capture. Final vibrational distributions reported here differ markedly from earlier calculated distributions. Level shifts due to image effects cause H 2 n =2-parentage capture to be marginally accessible for barium surfaces (ø = 2.7 eV) but quite possible for cesium (ø = 2.14 eV) and Cs/Mo (ø ≈1.6 eV) surfaces. Predissociation of H 2(c3IIu) competes with Auger relaxation but predissociation times are too long to allow significant H 2 dissociation. Opposing image shifts of H 2 -(2Σu), H 2(X1 Σg) allow direct H - formation from H 2 (v″) by rebounds from Ba, Cs, Cs/Mo surfaces. H - yields are evaluated explicitly for Ba surfaces. For H 3 + incident: (1) Small (2%) electric dissociation to H + + H 2 (2) resonant capture to 2p 2 E’→2 A 1, 2 B 2 states; (3) drifting H 3(v“’) in 2 A 1 ground electronic state dissociates into H 2+H to provide H 2(v ″) distribution; (4) hard collision of drifting H 2(v ″) produces final distribution H 2 (v ″). Final vibrational distributions from H 2 + and H 3 + are compared. Low work function surfaces allow capture into H 3(2s 2 A’1) and H 3(2p 2 A 2“) states. Vibrational and rotational couplings, respectively, couple" @default.
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• W1617811586 date "1990-01-01" @default.
• W1617811586 modified "2023-09-27" @default.
• W1617811586 title "Atomic and Molecular Surface and Volume Processes in the Analysis of Negative Hydrogen Discharges" @default.
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• W1617811586 doi "https://doi.org/10.1007/978-1-4615-3780-9_41" @default.
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