Low Pressure Electric Discharge Detectors

1958 ◽  
Vol 30 (8) ◽  
pp. 1309-1314 ◽  
Author(s):  
R. C. Pitkethly
Keyword(s):  
Electric Discharge ◽  
Low Pressure

scholarly journals Some experiments on helium

1897 ◽  
Vol 60 (359-367) ◽  
pp. 449-453 ◽  
Keyword(s):  
Electric Discharge ◽  
Low Pressure ◽  
British Association ◽  
Green Line ◽  
Vacuum Tube ◽  
Partial Separation ◽  
Astrophysical Journal

In July of last year Professors Runge and Paschen (‘Phil Mag.,' 1895, [ii], vol. 40, pp. 297—302) announced their discovery that the spectrum of the gas from clèveite indicated the presence of two elements. They also stated that by means of a single diffusion through an asbestos plug, they had been able to effect a partial separation of the lighter constituent, which was characterised by the green glow which it gave under the influence of the electric discharge in a vacuum-tube, and which was represented in the spectrum by the series containing the green line, λ = 5015·6. Subsequently, at the meeting of the British Association at Ipswich, Professor Runge exhibited a tube containing the so-called green constituent; the colour of the glow differed strongly from that of an ordinary helium tube, but the gas contained in it was evidently at very low pressure, as phosphorescence was just commencing. Professor Runge has since acknowledged that the green effect in the helium tube may be produced by a change of pressure alone (‘Astrophysical Journal,’ January, 1896).

The B′ 1Σu+ → X 1Σg+ and D 1Πu → X 1Σg+ band systems of molecular hydrogen

1994 ◽  
Vol 72 (11-12) ◽  
pp. 856-865 ◽  
Author(s):  
Hervé Abgrall ◽  
Evelyne Roueff ◽  
Françoise Launay ◽  
Jean-Yves Roncin
Keyword(s):  
Excited State ◽  
Spectral Line ◽  
Electric Discharge ◽  
Molecular Hydrogen ◽  
Low Pressure ◽  
Schrödinger Equations ◽  
Molecular Constants ◽  
Electronic Excited State ◽  
First Time ◽  
Line Positions

Spectral line positions and emission probabilities of the B′ 1Σu+ → X 1Σg+ and D 1Πu → X 1Σg+ band systems of molecular hydrogen have been calculated by solving a system of four coupled Schrödinger equations. A great number of rotational lines, emitted by a low-pressure electric discharge in H2, have been identified from 122 nm down to 78 nm. All the 69 bands of the B′ 1Σu+ → X 1Σg+ system and many high-J lines of 145 bands of the D 1Πu → X 1Σg+ system are reported for the first time. Improved molecular constants are derived for the (unperturbed) electronic excited state D 1Πu−.

Low-pressure electric discharge

1928 ◽  
Vol 205 (1) ◽  
pp. 103-111 ◽  
Author(s):  
C. Del Rosario
Keyword(s):  
Electric Discharge ◽  
Low Pressure
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