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- W2068085507 abstract "A characteristic two-section profile of excited-state populations is observed in a hollow cathode discharge and is explained by coexistence of the coronal equilibrium (CE) and the local thermodynamic equilibrium (LTE). At helium pressure 0.1 Torr and cathode current 200–300 mA, vacuum ultraviolet radiations from He I 1snp1P (n = 2–16) and He II np2P (n = 2–14) are resolved with a 2.2-M McPherson spectrometer. Relative populations of these states are deduced from the discrete line intensities and are plotted against energy levels. For both the He I and He II series, as energy level increases, populations of high-n (n>10) states are found to decrease much more quickly than low-n (n<7) populations. While low-n populations are described with the CE dominated by direct electron-impact excitations, high-n populations are fitted with the LTE to calculate the population temperatures of gas atoms and ions. Validities of the CE and LTE in different n-ranges are considered on the competition between radiative decays of the excited states and their collisions with gas atoms." @default.
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- W2068085507 date "2005-04-14" @default.
- W2068085507 modified "2023-09-23" @default.
- W2068085507 title "Coronal and Local Thermodynamic Equilibriums in a Hollow Cathode Discharge" @default.
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- W2068085507 doi "https://doi.org/10.1088/0256-307x/22/5/044" @default.
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