Abstract A glow discharge tube that serves as a source for exciting specimens for analysis of light emission or for mass analysis, and in which the exhaust resistance is allowed to be set for the discharge region independently of the discharge gap. The gas is exhausted through a narrow gap (G1) between the surface of a specimen (4) and an insulating tube (8) that surrounds an anode tube (2), in order to maintain a pressure in the anode tube (2) optimum for effecting glow discharge. Glow discharge is allowed to take place between the anode tube (2) and the specimen (4). Since the insulating tube (8) protrudes toward the specimen (4) beyond the anode tube (2), the anode and the cathode are not shortcircuited even when vapor from the specimen adheres to the exhaust paths (G1, G2).
A glow discharge tube for analysis in which a sample (4) used as a cathode is placed facing one end of an anode tube (2) with a pre-determined electrical discharge gap, gas from the discharge gap (G0) being led along the outer side of the anode tube (2) so as to be exhausted, characterized by comprising an insulating tube (8) fitted directly on said anode tube (2), an end of said insulating tube (8) projecting beyond said anode tube end towards the sample whereby to define an exhaust gas constriction (G1) in the discharge region between the anode (2) and the cathode (4), said constriction (Gl) being narrower than said discharge gap (GØ).
Claim 2
Dependent Claim
113 words
A glow discharge tube for analysis in which a sample (4) used as a cathode is placed facing one end of an anode tube (2) with a pre-determined electrical discharge gap, gas from the discharge gap (G0) being led along the outer side of the anode tube (2) so as to be exhausted, characterized by comprising an insulating tube (8) fitted directly on said anode tube (2), an end of said insulating tube (8) projecting beyond said anode tube end towards the sample whereby to define an exhaust gas constriction (G1) in the discharge region between the anode (2) and the cathode (4), said constriction (Gl) being narrower than said discharge gap (GØ).
Claim 3
Dependent Claim
63 words
The glow discharge tube for analysis as claimed in claim 1, characterized in that said glow discharge tube comprises a mantle (3) surrounding the outer circumferential surface of said insulating tube (8) to define an annular exhaust passage (G2) therebetween, said mantle also providing a support so as to locate the sample (4) in the appropriate position to achieve the discharge gap (GØ).
Claim 4
Dependent Claim
50 words
The glow discharge tube for analysis as claimed in claim 2, characterized in that the mantle (3) is an. insulating member having a conducting element (9) set on the wall surrounding said exhaust passage (G2), said conductor (9) being connected neither to the anode (2) nor to the cathode (4).
Claim 5
Dependent Claim
31 words
The glow discharge tube for analysis as claimed in claim 1, characterized in that the axial position of said insulating tube (8) is adjustable with respect to the anode tube (2).
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