A method and device for measuring ion concentration in a defined space including disposing at least one conductive surface in a defined space, generating a flow of ions from an ion generator having an anode and a cathode into the defined space, measuring one of voltage across or direct current (DC) through a resistor connected between the cathode and the at least one conductive surface, and determining ion concentration in the defined space based upon a proportionality of ion concentration to the measured voltage or current.

A discharge ionization detector includes: a gas passage (104, 120) through which an electric-discharge gas is to be passed; a plasma generation electrode (106-108) configured to generate an electric discharge in the gas passage so as to generate plasma from the electric-discharge gas; a sample-gas introduction section (124) through which a sample gas is introduced into the gas passage; a collection electrode (117) configured to collect ions generated from a sample with the plasma; a bias electrode (113) located between the plasma generation electrode and the collection electrode, and configured to create an electric field for guiding the charged particles to the collection electrode; and a DC power unit (131, 133) capable of independently controlling a voltage applied to the bias electrode and a voltage applied to the collection voltage. A peak-shape abnormality in a signal output can be suppressed by appropriately adjusting the voltages.

A discharge ionization detector includes: a gas passage (104, 120) through which an electric-discharge gas is to be passed; a plasma generation electrode (106-108) configured to generate an electric discharge in the gas passage so as to generate plasma from the electric-discharge gas; a sample-gas introduction section (124) through which a sample gas is introduced into the gas passage; a collection electrode (117) configured to collect ions generated from a sample with the plasma; a bias electrode (113) located between the plasma generation electrode and the collection electrode, and configured to create an electric field for guiding the charged particles to the collection electrode; and a DC power unit (131, 133) capable of independently controlling a voltage applied to the bias electrode and a voltage applied to the collection voltage. A peak-shape abnormality in a signal output can be suppressed by appropriately adjusting the voltages.

The invention aims to suppress an effect of noise and heat generated from a memory on a measurement result in an ion concentration measuring device that uses an ion detection element for outputting a potential corresponding to the concentration of ions. The ion concentration measuring device according to the invention includes a cartridge having an ion detection element and a memory and supplies power to the memory in a time period excluding a time period for which the potential generated by the ion detection element is acquired.

The invention aims to suppress an effect of noise and heat generated from a memory on a measurement result in an ion concentration measuring device that uses an ion detection element for outputting a potential corresponding to the concentration of ions. The ion concentration measuring device according to the invention includes a cartridge having an ion detection element and a memory and supplies power to the memory in a time period excluding a time period for which the potential generated by the ion detection element is acquired.

A microscale gas breakdown device includes a first surface and a second surface. The first surface and the second surface define a gap distance. The device includes a perturbation on the first surface or the second surface. The perturbation is defined by a height value and a radius value. The device includes a current source or a voltage source configured to apply a current or a voltage across the first surface and the second surface. In response to the current or the voltage being applied, a resulting discharge travels along a first discharge path in response to being exposed to a high pressure and a second discharge path in response to being exposed to a low pressure.

A microscale gas breakdown device includes a first surface and a second surface. The first surface and the second surface define a gap distance. The device includes a perturbation on the first surface or the second surface. The perturbation is defined by a height value and a radius value. The device includes a current source or a voltage source configured to apply a current or a voltage across the first surface and the second surface. In response to the current or the voltage being applied, a resulting discharge travels along a first discharge path in response to being exposed to a high pressure and a second discharge path in response to being exposed to a low pressure.

Provided is a chromatograph mass spectrometer that includes a component separation unit 13 that temporally separates components in a sample, a first detector 15 that acquires measurement data of components included in an outflowing liquid from the component separation unit 13 by an analysis method different from mass spectrometry, a mass spectrometer 2 that acquires mass spectrometry data including intensity information for each of mass-to-charge ratios of ions derived from the components contained in the outflowing liquid from the component separation unit 13, a chromatogram creation unit 45 that creates a chromatogram representing an intensity change of the measurement data with time based on the measurement data of the first detector 15, an information extraction unit 46 that detects a peak based on the intensity change of the mass spectrometry data with time, and extracts information including a representative time of the peak, and a chromatogram display unit 48 that displays the chromatogram together with additional information corresponding to the extracted time.

Provided is a chromatograph mass spectrometer that includes a component separation unit 13 that temporally separates components in a sample, a first detector 15 that acquires measurement data of components included in an outflowing liquid from the component separation unit 13 by an analysis method different from mass spectrometry, a mass spectrometer 2 that acquires mass spectrometry data including intensity information for each of mass-to-charge ratios of ions derived from the components contained in the outflowing liquid from the component separation unit 13, a chromatogram creation unit 45 that creates a chromatogram representing an intensity change of the measurement data with time based on the measurement data of the first detector 15, an information extraction unit 46 that detects a peak based on the intensity change of the mass spectrometry data with time, and extracts information including a representative time of the peak, and a chromatogram display unit 48 that displays the chromatogram together with additional information corresponding to the extracted time.

The disclosure provides a gas detector with an ionizing device for producing ions depending on a gas to be detected. The gas detector includes a catcher for receiving the electrical current produced by the ions, and a measuring device with an electrical measuring resistor. The electrical measuring resistor produces an electrical measuring potential from the current and is surrounded, at least in part, by an electrical shield resistor, denoted by R.sub.T. The same potentials, up to a deviation of at most 25%, are applied in the longitudinal direction of the electrical measuring resistor to mutually opposed regions of the electrical measuring resistor and the electrical shield resistor.