Agilent Technologies, Inc.

Maozi Liu

William R Trutna, Jr

Danielle Russell Chamberlin

Gangqiang Li

Jing Tang

Mingda Wang

Patrick D Perkins

Nigel P Gore

An ion transfer device includes a tube, a resistive layer on an inside surface of the tube, and a dielectric layer on the resistive layer. The device defines a conduit providing a transfer path for gas and ions. The conduit is surrounded by the dielectric layer. The dielectric layer protects the resistive layer from the chemical environment in the conduit, while being thin enough to allow charges to pass through the dielectric layer and be dissipated by the resistive layer.

Dielectric coated ion transfer device for mass spectrometry

An ion transfer device for transferring ions from a first chamber to a second, reduced-pressure chamber includes a tube and a bore selector. The tube includes a plurality of tube bores. The bore selector is positioned at an inlet end of the tube and includes an inlet port. The tube is movable relative to the bore selector, and/or the bore selector is movable relative to the tube, to align the inlet port with a selected one of the tube bores while blocking the other tube bores. Alignment of the inlet port with the selected tube bore defines an ion transfer path from the first chamber, through the selected tube bore, and to the second chamber. The ion transfer device may be utilized, for example, in an atmospheric-pressure interface of a mass spectrometer.

Ion transfer device for mass spectrometry with selectable bores

A gas chromatograph-mass spectrometer (GC-MS) system includes a multi-capillary GC column coupled to a mass analyzer through an ionization interface. The ionization interface includes an ionization device and an ion guide configured for receiving a high-capacity gas-sample flow from the GC column and transmitting a compressed ion beam to the mass analyzer. The ion beam may be converging.

Multi-capillary column and high-capacity ionization interface for GC-MS

Methods, systems and computer readable media for computing small particle size distributions of particles in a process stream comprising a sample dilute colloid. A reference matrix of pre-computed reference vectors is provided. Each reference vector represents a discrete particle size or particle size range of a particle size distribution of particles contained in a dilute colloid. Each reference vector represents a reference extinction spectrum over a predetermined wavelength range. A measurement vector representing a measured extinction spectrum of the sample particles in the sample colloid is provided, wherein the measured extinction spectrum has been spectrophotometrically measured over the wavelength range. The particle size distribution and particle concentrations of the particles in the sample colloid are determined using the reference matrix, the measurement vector and linear equations.

Methods and systems for computing a particle size distribution of small particles in a process

Methods, systems and computer readable media for computing small particle size distributions. A reference matrix of pre-computed reference vectors is provided, with each reference vector representing a discrete particle size or particle size range of a particle size distribution of particles contained in a dilute colloid. A measurement vector of measured extinction values of a sample dilute colloid is provided, wherein the measured extinction values have been measured by spectrophotometric measurement at the discrete wavelengths. Size distribution and concentrations of particles in the sample dilute colloid are determined using linear equations, the reference matrix and the reference vector.

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Maozi Liu