In-situ Density and Temperature Measurements of Vibrationally-excited Hydrogen Molecules in Ion Source Plasmas PDF Download
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Languages : en
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The role of highly vibrationally-excited hydrogen molecules has been postulated to be of great importance in H/sup /minus// ion sources. However the difficulty of making in-situ measurements has led to a paucity of direct determinations of these species within the plasma of these sources. Recently, vacuum-ultraviolet (VUV) laser absorption spectroscopy has been used to measure the H2 rovibrational populations up to v(prime)(prime) = 5 and J(prime)(prime) = 8 in a medium-power hydrogen plasma. This work extends those measurements to v(prime)(prime) = 8 and to J(prime)(prime) = 13. The populations of the vibrational levels still appear to be almost Boltzmann. The theoretically predicted plateau is not observed up to the detection limit. The dependence of several vibrational levels on discharge current and filling pressure is shown. 15 refs., 4 figs.
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Languages : en
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The role of highly vibrationally-excited hydrogen molecules has been postulated to be of great importance in H/sup /minus// ion sources. However the difficulty of making in-situ measurements has led to a paucity of direct determinations of these species within the plasma of these sources. Recently, vacuum-ultraviolet (VUV) laser absorption spectroscopy has been used to measure the H2 rovibrational populations up to v(prime)(prime) = 5 and J(prime)(prime) = 8 in a medium-power hydrogen plasma. This work extends those measurements to v(prime)(prime) = 8 and to J(prime)(prime) = 13. The populations of the vibrational levels still appear to be almost Boltzmann. The theoretically predicted plateau is not observed up to the detection limit. The dependence of several vibrational levels on discharge current and filling pressure is shown. 15 refs., 4 figs.
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Category : Power resources
Languages : en
Pages : 840
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Category : Power resources
Languages : en
Pages : 848
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Category : Aeronautics
Languages : en
Pages : 704
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Languages : en
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A new technique, vacuum-ultraviolet laser-absorption spectroscopy, has been developed to quantitatively determine the absolute density of H and H2 within a plasma. The technique is particularly well suited to measurement in a plasma, where high charged particle and photon background complicate other methods of detection. The high selectivity and sensitivity of the technique allows for the measurement of the rotational-vibrational state distribution of H2 as well as the translational temperature of the atoms and molecules. The technique has been used to study both pulsed and continuous H/sup /minus// ion-source plasma discharges. H2 state distributions in a multicusp ''volume'' H/sup /minus// ion- source plasma show a high degree of internal excitation, with levels up to v = 5 and J = 8 being observed. The method is applicable for a very wide range of plasma conditions. Emission measurements from excited states of H are also reported. 17 refs., 9 figs.
Author: Geoffrey Carlos Stutzin
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Category :
Languages : en
Pages : 574
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Category :
Languages : en
Pages : 532
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ISBN:
Category : Physics
Languages : en
Pages : 1420
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Category :
Languages : en
Pages :
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Using vacuum ultraviolet laser-absorption spectroscopy, the H° density and temperature are measured as a function of discharge current and H2-gas flow in both the plasma column and the drift region between the plasma column and the emitter in the 4X source. For typical source operating parameters, the atom temperature is 1.5 eV in the plasma column and 0.6 eV in the drift region; the atom density, 7 x 1014 cm/sup /minus/3/ in the plasma column and 4 x 1014 cm/sup /minus/3/ in the drift region. Separate measurements give 2% for the ratio of H2 molecules in the first vibrational level to the total H2 density. 8 refs., 6 figs., 1 tab.
Author: European Council for Nuclear Research. Library
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Category : Nuclear physics
Languages : en
Pages : 10
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