Radiant energy – Ionic separation or analysis – With sample supply means
Patent
1987-08-07
1990-10-16
Berman, Jack I.
Radiant energy
Ionic separation or analysis
With sample supply means
250281, 250282, 250423R, 31511181, 3133631, H01J 4904, H01J 4926
Patent
active
RE0333867
ABSTRACT:
A plasma is generated within an induction coil and the plasma is sampled through an orifice into a vacuum chamber for mass analysis of trace ions in the plasma. Arcing at the orifice is prevented by grounding the induction coil at or near its center, thus eliminating ultraviolet noise and reducing average ion energies and ion energy spread, as well as preventing destruction of the orifice. The elimination of arcing at the orifice allows the use of a sharp edge orifice structure to prevent formation of a cool boundary layer over the orifice and also permits direct sampling of the plasma. The direct sampling and the lack of cooling prevent recombination and reaction of the ions with oxygen and improve the response to elements of high ionization potential, increasing the desired ion signal and greatly reducing the presence of oxides which would otherwise complicate the spectrum.
REFERENCES:
patent: 2831134 (1958-04-01), Reifenschweiler
patent: 3085058 (1963-04-01), Buchsbaum
patent: 3143680 (1964-08-01), Klein et al.
patent: 3944826 (1976-03-01), Gray
Goodwin, The Review of Scientific Instruments, vol. 24, No. 8, Aug. 1953, pp. 635-638.
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