Chinese Academy of Sciences

Haiyang Li

Weiguo Wang

Keyong Hou

Lei Hua

Huapeng Cui

Qinghao Wu

Yongzhai Du

This invention relates to the field of mass spectrometry, and more specifically to a vacuum ultraviolet photoionization and chemical ionization combined ion source, which consists of a vacuum ultraviolet light source and an ion source chamber. An ion acceleration electrode, an ion repulsion electrode, an ion extraction electrode, and a differential interface electrode positioned inside the ion source chamber are arranged along the exit direction of the vacuum ultraviolet light beam in sequence and spaced, coaxial, and parallel from each other. The ion acceleration electrode, the ion repulsion electrode, the ion extraction electrode, and the differential interface electrode are all plate structures with central through holes. The vacuum ultraviolet light beam passes through the central through holes of the electrodes along the axial direction. By utilizing a single vacuum ultraviolet light source, the ion source is feasible to switch between two ionization modes, vacuum ultraviolet photoionization (VUV PI) and chemical ionization (CI), under suitable ion source pressure, thus greatly expanding the range of detectable samples.

Vacuum ultraviolet photoionization and chemical ionization combined ion source for mass spectrometry

Provided is a spatial focusing ion mobility tube, including an ionzation source, an ion gate, a grid mesh and a faraday disc. A focusing grid mesh parallel to the ion gate is provided at one side of the ion gate away from the ionization source, and the ion gate and the focusing grid mesh combine into a spatial focusing ion gate assembly which controls the flight of the ions. The mobility tube employs a traditional design and changes the ion gate portion to one or more spatial focusing ion gate assemblies. The spatial focusing assembly can realize the injection function of the ion gate and produce the spatial compression focusing of ions.

Spatial focusing ion gate assembly and spatial focusing ion mobility spectrometer

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Dalian, China

Haiyang Li