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1998 (1)
1997 (1)
1Author    L. Szalai, M. Ulbel, T. Neger, G. Pretzler, Z. Donkó, K. Rózsa, R. C. TobinRequires cookie*
 Title    Spectral-Interferometry Measurements of Copper Atom Concentration in a Segmented Hollow Cathode Discharge  
 Abstract    We report spectral-interferometry measurements of the concentration and the spatial distribution of copper vapor in a high voltage, segmented hollow cathode discharge, which is an efficient source for laser light generation. The concentration of sputtered copper atoms was found to be in the order of 10 14 cm ~ 3 at currents of 0.6-1.0 A in a 5 cm long, 4 mm bore diameter discharge tube, operating in argon buffer gas. At high pressures and relatively low current densities the sputtered metal concentration forms two maxima near the cathode surface. With increasing current and decreasing pressure these two maxima move towards the center of the discharge. This result may account for the fact that at certain discharge parameters the segmented hollow cathode lasers operate in higher order transverse modes near the threshold. The measurements of copper vapor concentration show increased sputtering compared to conventional hollow cathodes, which is considered to be one of the reasons for segmented hollow cathode metal ion lasers being more efficient. 
  Reference    Z. Naturforsch. 52a, 771—777 (1997); received July 12 1997 
  Published    1997 
  Keywords    Optical spectroscopy, optical interferometry, glow discharges, sputtering, gas lasers 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0771.pdf 
 Identifier    ZNA-1997-52a-0771 
 Volume    52 
2Author    M. Jánossy, P. MezeiRequires cookie*
 Title    Excitation of the 210 nm Zn II Line in a Hollow Cathode He-Ne-Zn Discharge  
 Abstract    In a hollow cathode He-Zn discharge it was observed that addition of Ne stops laser oscillation at the 492.4 nm Zn II line and increases significantly the spontaneous intensity at the 210 nm Zn II line, which originates from the 4d 2 D 5/2 lower level of the laser transition. Based on a rate equation model, the cross-section of the Ne ion-Zn atom charge transfer collisions populating the 4d 2 D 5/2 level was determined. The cross-section 3.5x 10 -15 cm 2 found by us is in acceptable agreement with the value 2.3x 10" 15 cm 2 reported in the literature. This high cross-section together with existing lower level depopulation points to the possibility of obtaining laser oscillation at 210 nm in a Ne-Zn discharge. 
  Reference    Z. Naturforsch. 53a, 955—959 (1998); received April 6 1998 
  Published    1998 
  Keywords    Gas Lasers, Laser Excitation, Charge Transfer, Glow Discharges, Sputtering 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0955.pdf 
 Identifier    ZNA-1998-53a-0955 
 Volume    53