Electronic excitation of the 750- and 811-nm lines of argon

Scanning drift tube measurements of electron transport parameters in different gases: argon, synthetic air, methane and deuterium

“…The present values of the reduced ionization coefficient are shown in figure 3(c) in comparison with the data of Jelenak et al [34] and Bozin et al [35] who obtained the ionization and excitation coefficients for a wide range of the reduced electric field, 50 Td-9 kTd, via measurements of the spatial dependence of the optical emission intensity from a stationary Townsend discharge (operated in the µA regime); Specht et al [36] who deduced the ionization coefficient from the ratio of the integrated ion and electron cur rents in a pulsed drifttube apparatus, and Lakshminarasimha and Lucas [37] who obtained N / α under stationary conditions, between 8 and 1271 Td, based on the measurements of the current as a function of electrode gap in a drift tube. Our measured values (of which the accuracy we estimate to be below 6%) cover a wider range of E/N, compared to the previous studies.…”

“…The results were accepted and are presented here only for those cases when the deviations between the data obtained from the fits over different z domains were within ±3% for W, ±5% for D L and ν (±10% for synthetic air, due to the worse signal to noise ratio, see later). [31], Nakamura [32], Hernández-Ávila et al [33], Jelenak et al [34], Bozin et al [35], Specht et al [36], Lakshminarasimha and Lucas [37]. Panel (a) [25] reprinted with permission AIP Publishing LLC.…”

Negative Differential Resistance, Oscillations and Constrictions of Low Pressure, Low Current Discharges

“…Low current'diffise discharges are also often used to perform swarm experiments [19] and therefore detqrmine data on atomic and molecular processes. Assumption of uniform field that may be essential for such purposes should be verified by following some of the procedures described in this paper Such experiments are the only method to sufficiently'simplify the discharge in order to be able to rule out competing processes and identify some of the physical phenomena such as heavy particle excitation [20], excitation after surface reflection of heavy particles [21] and electron backscattering [lo] and its influence on discharge kinetics.…”

Electron excitation coefficients for 2p and 3p levels of Xe

“…The drift tube is the same as used for the measurement of the excitation coefficients of the 2p levels of neon [16] and argon [13]. The tube has two parallel electrodes of 7.9 cm in diameter separated by 1.7 cm.…”

“…We apply a similar technique that has been used in our previous measurements in argon [13], hydrogen [14], nitrogen [15] and neon [16]. The experimental set-up and procedure are described in Section 2.…”