Electric Discharge in Gases at Low Pressure

Nature ◽  
1925 ◽  
Vol 116 (2916) ◽  
pp. 429-430 ◽  
Author(s):  
B. N. BANERJI
Keyword(s):  
Electric Discharge ◽  
Low Pressure ◽  
Electric Discharge In Gases

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−.

scholarly journals Luminous vapours distilled from the arc, with applications to the study of spectum series and their origin.-I

1914 ◽  
Vol 90 (619) ◽  
pp. 364-372 ◽  
Keyword(s):  
Electric Field ◽  
Electric Discharge ◽  
Small Scale ◽  
Mercury Lamp ◽  
Long Distance ◽  
Electric Discharge In Gases

In a paper entitled "Duration of Luminosity of Electric Discharge in Gases and Vapours," reference was made to a known phenomenon shown by the mercury arc in vacuo : when mercury is allowed to distil away from a mercury lamp into a lateral tube sealed on to it, the rapidly moving vapour carries its luminosity for a long distance out of the electric field. It was shown how effects not essentially different might be obtained with mercury, and other metals also, using not the arc, but the leyden jar spark between poles of the metal; but this method, owing to the intermittence of the sparks and the small scale of the effects, is far less satisfactory than the use of the arc. At the time of writing the paper cited, I thought that it would be very difficult to extend the use of the arc to metals less volatile than mercury, but the problem has proved more tractable than was expected 2. Method of Experimenting-Apparatus used . The vessel in which the arc is confined will be called, for convenience, a lamp, though it is not used directly as a source of light.

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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