摘要:
Le dispositif comporte plusieurs collecteurs (11) juxtaposés le long du plan de masse (2) de l'appareil de dispersion. Chaque collecteur est couplé à un dispositif de détection (16 i ) par l'intermédiaire d'un secteur électrostatique (14 i ) dont l'angle de courbure (φ) est approximativement égal à l'angle d'inclinaison du plan de masse par rapport à l'axe du faisceau de particules arrivant sur le plan de masse (2) pour redresser l'axe du faisceau de particules perpendiculairement au plan de masse (2). Applications : Spectromètres de masse.
摘要:
A charged particle optical system, e.g. an energy or mass analyser or a lens system, has a plurality of corrector electrodes (20 to 23) spaced apart across a particle beam passing from a monoenergetic source (4) to a focus (6) and dividing the beam into individual portions with central trajectories (30,31,32) the connector electrodes being electrically biassed to deflect the particles of the beam so as to reduce the aberration caused by portions with central trajectories intersecting the optical axis at different distances from the desired focus.
摘要:
A periodic field differential mobility analyzer apparatus for separating and identifying ionic analytes employs a series of elongated parallel channels, a pump, a first voltage providing an electric field Ex in a direction opposing the gas flow, a second voltage providing an electric field Ey in a direction perpendicular to the gas flow, an ion source, and a detector. The periodic field differential mobility analyzer provides high resolution and sensitivity.
摘要:
An ion mobility spectrometer or other ion apparatus has two or three grid electrodes 51 and 52; 151 to 153; 106 and 107; 106′ and 107′ extending laterally of the ion flowpath. An asymmetric waveform with a dc compensating voltage is applied between the electrodes to produce a field parallel to the ion flow path that affects ions differently according to their field-dependent mobility. This filters or delays different ions selectively in their passage to an ion detector 11, 111, 111′ to facilitate discrimination between ions that would otherwise produce a similar output.
摘要:
The invention relates to a method and device for measuring gaseous substances, in which the method comprises the stages: ionization of the sample gas in a gas flow, leading of the ionized gas flow through an elongated ion-mobility measuring chamber in the cross-section defined by it, filtering out of ions from the ionized gas flow at a distance from the measuring electrodes, permitting the passage of only the ions travelling from the flow cross-section at the selected point, separation of ions with a different ion mobility, with the aid of a transverse static electric field and at least one measuring-electrode pair arranged along the wall of the measuring chamber.
摘要:
The invention relates to a method and a device for introducing ions into an ICR cell of Fourier transform ion cyclotron resonance mass spectrometers, in particular with a reduced the magnetron orbit. The invention is based on applying at least one gated DC voltage to a mantle electrode of the ICR cell prior to the excitation of the cyclotron motion such that injected ions are deflected inside the ICR cell in at least one radial direction.