Light source for producing atomic spectral line

Details Light source for producing atomic spectral line Light source for producing atomic spectral line

1983-07-13

1985-12-31

DeMeo, Palmer C.

Electric lamp and discharge devices

With temperature modifier

Envelope with condensing chamber or surface

313 40, 313618, H01J 6109, H01J 6152

Patent

active

045623767

ABSTRACT:
Disclosed is a light source having an envelope containing therein an anode and a hollow cathode, in which the hollow cathode is supported by a hollow metal cylinder. The hollow cylinder externally extends out of the envelope and a plurality of radiation fins are attached on the outer wall of the externally extending portion of the cylinder. Meshes are provided on the inner wall of the hollow chamber of the cylinder. Water is sealed in the hollow chamber under a reduced pressure to facilitate evaporation. The condensed water is displaced toward a high temperature portion by capillarity. The water is evaporated at the high temperature portion while taking away the latent heat of evaporation. In such an arrangement, the cathode is maintained at a low temperature so that the self-absorption of the spectral line can be reduced.

REFERENCES:
patent: 1954958 (1934-04-01), Smythe
patent: 2629836 (1953-02-01), Deri
patent: 3205388 (1965-09-01), De Lany et al.
patent: 3401292 (1968-09-01), Cirri
patent: 3405299 (1968-10-01), Hall et al.
patent: 3605074 (1971-09-01), Freggens
"Evaluation of New High Frequency Discharge Lamps for Atomic Absorption . . . ," by K. Tsujii et al., Analytica Chimica Acta, 111, 1979, pp. 103-109.

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