Dr. Franzen Analysentechnik Gmbh & Co. Kommanditgesellschaft

Varian Mat Gmbh

Jochen Franzen

Gerhard Weiss

Curt Brunnee

Stefan Meier

A mass spectrometer, including an ion source, a mass filter and at least one ion detector, wherein the mass filter and ion detector are not arranged in alignment but are laterally staggered. Between the mass filter and the ion detector, there is arranged an elongated electrostatic, essentially cylinder-shaped, radial guide field. This guide field guides the ions with a velocity component which extends axially to the guide field in elliptical helical paths about its axis toward the input of the ion detector.

Mass spectrometer

Ionization chamber for the chemical ionization of vapors of substances in ion-molecule reactions by means of ionizing primary particles and a reactance gas, having at least one inlet opening for feeding the reaction partners and at least one outlet opening for the reaction products formed in the chamber. As shown, the ionization chamber has an elongated shape. The inlet opening for the ionizing primary particles on the one hand, and the outlet opening for the reaction products on the other hand, are arranged in alignment in opposite end walls of the ionization chamber.

Ionization chamber for chemical ionization

Ions from an unknown and two known masses are fed through a quadrupole mass filter to an electron multiplier detector whose digitally converted output is supplied to a data processing device. The latter controls the alternating and DC signals fed to the paired electrode rods of the filter. The data processing device performs transformations on the mass characteristic curves derived from the ions to equalize their widths, heights and shapes, and then determines the distance between the normalized curves using a voltage shifting technique to superimpose the curves one on another. The unknown mass may then be accurately determined from the separation distances.

Method and apparatus for the comparative determination of an unknown mass

A method for producing a highly precise and inherently stable analyzer system for a multipole mass filter, wherein a tube of material that is electrically poorly conductive and thermally softenable is put over a core which is precise in size, has a higher expansion coefficient and has parallel grooves. The tube material is joined to the grooves of the core by heating and, subsequently, after cooling for the purposes of solidifying, is removed from the core with the impressed tube indentations. Before the tube is heated, layers of electrically higher conductive metallic components, which can be easily connected to the softenable tube material, are applied between the core and the tube in the region of the grooves. The layer material is connected to the tube material when the tube is softened and joined to the grooves of the tube. When removing the tube that has been shaped in this manner, the layers connected to the impressed tube indentations are also removed from the core. An analyzer system produced according to the inventive method is also disclosed.

Method for producing a mass filter analyzer system and analyzer system

Organic samples 10 coming from a liquid chromatograph 11 are deposited on a conveyor belt 13 which transports them into a vacuum chamber at the entry end of a mass spectrometer. The samples are ionized directly on the belt by ion bombardment or using a gaseous charge carrier. Ionization is enhanced by applying an oxide layer to the belt, by neutralizing the image force, and by vaporizing alkali atoms on the belt to reduce the ionization potential.

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Wildeshausen, Germany

Jochen Franzen