Radiant energy – Ionic separation or analysis – Methods
Patent
1988-10-28
1989-08-29
Fields, Carolyn E.
Radiant energy
Ionic separation or analysis
Methods
250281, 250288, H01J 4900
Patent
active
048619876
ABSTRACT:
Process for the detection of a chemical substance of known mass M with the aid of an apparatus incorporating an ion source (1) producing ions of the substance of mass M from a gaseous atmosphere to be analyzed; a dissociation box (3) in which the ions of the substance of mass M dissociate into fragments of known masses m.sub.1, m.sub.2 . . . m.sub.p, characteristic of the substance of mass M to be identified; an electrostatic analyzer (4) filtering the ions of energy W; a magnetic analyzer (5) operating with an induction B.sub.o in its air gap, characterized in that: the value B.sub.o is fixed by choosing for V and W values V.sub.o, W.sub.o such that an atom of mass M.sub.o traverses the apparatus, which is carried out in known manner, on satisfying the equations ##EQU1## in which R is the radius of curvature of the trajectory of the ion in the magnetic analyzer; for the investigating the presence in the atmosphere to be analyzed of the known substance of mass M able to dissociate into known fragments of masses m.sub.1 =x.sub.1 M, m.sub.2 =x.sub.2 M . . . m.sub.p =x.sub.p M the apparatus is calibrated for the specific investigation of the mass M by giving V.sub.o and W.sub.o new values V' and W' such that V'M=V.sub.o M.sub.o and W'-eV', followed by the sequential investigation of the different fragments m.sub.p by effecting on each occasion V.sub.p =(V'/x.sup.2.sub.p) and W.sub.p =(W'/x.sub.p) which allows the ion of mass m.sub.p to traverse the complete apparatus and to be revealed by the ion detector; from it is deduced the effective presence of the substance of mass M.
REFERENCES:
patent: 3916188 (1975-10-01), Devienne
patent: 4472631 (1984-09-01), Enke et al.
patent: 4536652 (1985-08-01), Cooks et al.
patent: 4588889 (1986-05-01), Naito
Fields Carolyn E.
Miller John A.
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