Distribution radiale des atomes excités dans une colonne positive de néon

Abstract

La distribution radiale des atomes de néon excités dans les états 2p 5 3p et 2p5 3s est expérimentalement déterminée dans la colonne positive d'une décharge continue. Le couplage électronique entre ces configurations est étudié pour des pressions variant entre 0,5 et 4 torrs

The application of CW laser collisionally induced fluorescence modelling to determine neon excited-state electron collisional rate coefficients

“…For these calculations we used an average electron speed of 8.8 × 10 7 cm s −1 corresponding to a temperature of 3.0 eV measured with a single Langmuir probe [46] for the electrons in the bulk of the energy distribution. This temperature agrees well with the value of 2.8 eV measured by Valignat et al [48] in the positive column of a similar neon discharge. Again there is good agreement between these and our fitted values.…”

“…Table 3. Fitted and values from the literature of the excitation rate coefficients, S ij , for all of the allowed 1s-2p transitions at 2 Torr, expressed in units of 10 −7 cm 3 s −1 , where (a) are obtained from our LCIF fitting, (b) are the corresponding rate coefficients found by using a temperature of 3.0 eV, as measured by single Langmuir probe [46], and the modified average cross section approximation of Hyman [28] together with the oscillator strengths given by Taylor et al [44], and (c) found by combining the average electron speed for this temperature with the data presented by Valignat et al [48] for the Drawin cross section formula [27]. The 1s 2 -2p excitation coefficients have been omitted since the 1s 2 level plays a very minor role in the LCIF.…”