Influence of thin porous Al2O3 layer on aluminum cathode to the Hα line shape in glow discharge

Abstract

The results of the Balmer alfa line shape study in a plane cathode-hollow anode Grimm discharge with aluminum (Al) cathode covered with thin layer of porous Al2O3 are presented. The comparison with same line profile recorded with pure Al cathode shows lack of excessive Doppler broadened line wings, which are always detected in glow discharge with metal cathode. The effect is explained by the lack of strong electric field in the cathode sheath region, which is missing in the presence of thin oxide layer in, so called, spray discharge.

Influence of discharge conditions on energetic hydrogen atoms in a glow discharge

“…Excessive broadening of hydrogen Balmer lines is a phenomenon detected in different types of discharges with pure hydrogen or hydrogen mixtures (see, for instance, Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. It became obvious that this large broadening can only be caused by Doppler mechanism, therefore indicating presence of energetic hydrogen atoms with high velocities.…”

Spatially Resolved Profile and Shift of the Spectral Line in a Hollow Cathode Discharge

“…The detailed information on this function also allows optimizing both the operation mode of the light source and the optical scheme geometry. [4] Usually, the macroscopic electric field in a low-pressure gas discharge has been taken as negligible and no Stark effect in the profile taken in mind. [5] Some irregularities in the Lorentzian width of the profile under low gas pressure [6] evoked the present study.…”

Weaving the glow discharge net

“…7 In addition, work from the network has been recognized in different venues, for example, Vasilka Steflekova, ESR at the University of Belgrade, Faculty of Physics (FoPB), received an award at CSI XXXVI for her poster presentation that would serve as the basis for her paper exploring the effects of the surface oxide layer on an aluminium cathode on the shape of the H-alpha lines in glow discharge. 8 Annemie Bogaerts, Responsible Scientist at the University of Antwerp (UA), published an exceptional piece on modelling of Grimm-type GDs in argon-hydrogen mixtures, featured as a Hot article and on the inside cover of JAAS. 9 I could really go on-and-on, unfortunately, I only have a few editorial lines and it is not my intention to review all the studies performed during GLADNET, but rather depict different aspects of the network through certain studies.…”