Abstract: Method and device for identifying gases and/or ion mobility spectrometer and method for offsetting residual humidity are provided. The object of the invention is to develop a generic method for offsetting residual humidity in an ion mobility spectrometer and a related device, which has a simple structure and which fully exploits the reduced diffusion. This is achieved by a variable drift chamber drift gas velocity, which leads to differing penetration depths of the humidity into the drift chamber, and thus to variable residual humidities in the drift chamber. Methods of this type and the associated devices for detecting and identifying gases are used to recognise and identify chemical compounds, in particular explosive materials or material compounds and/or those which are damaging to health, and which must be identified in very low concentrations.

Abstract: Method and device for identifying gases and/or ion mobility spectrometer and method for offsetting residual humidity are provided. The object of the invention is to develop a generic method for offsetting residual humidity in an ion mobility spectrometer and a related device, which has a simple structure and which fully exploits the reduced diffusion. This is achieved by a variable drift chamber drift gas velocity, which leads to differing penetration depths of the humidity into the drift chamber, and thus to variable residual humidities in the drift chamber. Methods of this type and the associated devices for detecting and identifying gases are used to recognise and identify chemical compounds, in particular explosive materials or material compounds and/or those which are damaging to health, and which must be identified in very low concentrations.

Abstract: Methods and devices identify gases and allow immediate and simultaneous detection of the chemical compounds to be tested. The methods and devices use a function of the electric field strength, for identification the material-specific mobility and simultaneously the change in this mobility, which is achieved in that due to the resulting electric field, each ionized molecule has a drift velocity which is partially increased or decreased, wherein the resulting electric field is a DC field, on which an asymmetric AC field is superimposed. The methods and devices for the detection and identification of gases are used to identify and detect chemical compounds, such as, explosive and/or unhealthy substances or compounds, which may be detected in very small concentrations.

Abstract: The invention relates to identifying not easily volatilized substances, in particular hazardous material, in a gas phase. A measurement cell and gas supply installations connected to the measurement cell are heated, and a plasmonic surface arranged in the measurement cell is temperature-controlled such that the plasmonic surface has a lower temperature than the measurement cell and the gas supply installations. The gas phase is guided through the gas supply installations into the measurement cell such that the gas phase reaches the plasmonic surface. Substances adsorbed out of the gas phase on the plasmonic surface are analyzed by an optical process. Surface-enhanced Raman spectroscopy or surface-enhanced infrared spectroscopy may be used. Selectivity can be increased by combining both methods. Selectivity can be additionally increased by using a gas detector, preferably an ion-mobility spectrometer. Thus the false alarm rate is reduced without a loss of time.

Abstract: The invention relates to a method for identifying gases, which are ionized and the drift times of the positive and negative product ions through drift spaces are measured and the measured drift times are evaluated, wherein for measuring the drift times the product ions are accelerated to drift velocities by a resulting electrical field. It is provided that the positive and negative product ions move synchronously and in parallel in the same direction. The invention further relates to a device for identifying gases, which includes at least two drift tubes, wherein each of the drift tubes has at least one respective detector for detecting product ions. For this purpose, at least two drift tubes are arranged in parallel next to each other and are delimited, on one hand, by a common inlet system and, on the other hand, by at least one detector.

Abstract: The invention relates to a method for ionizing and identifying gases, wherein the gases to be identified are ionized in a reaction chamber and the product ions are measured, wherein the measurement of the product ions takes place via electrical fields acting on the product ions and the detection is performed with a detector for ions. It is provided that ionization takes place via UV radiation, and that simultaneously or sequentially ionization by electrons takes place. The invention further relates to a device for ionizing and identifying gases, which includes an ion source chamber having an ion source and an ion mobility spectrometer. For this purpose, a partition between the ion source chamber and the ion mobility spectrometer has a UV-transparent window and a window permeable for electrons, wherein UV radiation and electron radiation can be generated in the ion source chamber with the ion source.

Abstract: The invention relates to a method for identifying gases, which are ionized and the drift times of the positive and negative product ions through drift spaces are measured and the measured drift times are evaluated, wherein for measuring the drift times the product ions are accelerated to drift velocities by a resulting electrical field. It is provided that the positive and negative product ions move synchronously and in parallel in the same direction. The invention further relates to a device for identifying gases, which includes at least two drift tubes, wherein each of the drift tubes has at least one respective detector for detecting product ions. For this purpose, at least two drift tubes are arranged in parallel next to each other and are delimited, on one hand, by a common inlet system and, on the other hand, by at least one detector.

Abstract: The invention relates to a method for ionizing and identifying gases, wherein the gases to be identified are ionized in a reaction chamber and the product ions are measured, wherein the measurement of the product ions takes place via electrical fields acting on the product ions and the detection is performed with a detector for ions. It is provided that ionization takes place via UV radiation, and that simultaneously or sequentially ionization by electrons takes place. The invention further relates to a device for ionizing and identifying gases, which includes an ion source chamber having an ion source and an ion mobility spectrometer. For this purpose, a partition between the ion source chamber and the ion mobility spectrometer has a UV-transparent window and a window permeable for electrons, wherein UV radiation and electron radiation can be generated in the ion source chamber with the ion source.

Abstract: It is an object of the invention to develop a generic method for identification of gases and a corresponding device, which has a simple structure and allows immediate and simultaneous detection of the chemical compounds to be tested, and which uses for identification the material-specific mobility and simultaneously the change in this mobility as a function of the electric field strength. This is achieved in that due to the resulting electric field, each ionized molecule has a drift velocity which is partially increased or decreased, wherein the resulting electric field is a DC field, on which an asymmetric AC field is superimposed. These methods and associated devices for the detection and identification of gases are used to identify and detect chemical compounds, in particular explosive and/or unhealthy substances or compounds, which must be detected in very small concentrations.