Abstract: The present invention provides a mass spectrometer and a method for establishing a vacuum system thereof, the mass spectrometer having a hermetical chamber in communication with an external environment only through a vacuum interface, the chamber comprising a first chamber and a second chamber, the second chamber having an adsorption pump disposed therein, the first chamber being in communication with the second chamber through a flow restricting structure. The present solution can be applied to bench-top and even portable mass spectrometers, taking into account the low energy consumption, miniaturization and vacuum requirements of such mass spectrometers.

Abstract: The present invention relates to the technical field of analytical instruments, in particular to an ion source and a mass spectrometer. The ion source includes dielectric barrier discharge assemblies, wherein the dielectric barrier discharge assembly is composed of a first electrode plate, a dielectric spacer plate and a second electrode plate which are in close proximity in parallel in sequence, and a first through hole penetrating through the first electrode plate, a second through hole penetrating through the dielectric spacer plate and a third through hole penetrating through the second electrode plate are disposed corresponding to each other to form a gas passageway for gas to be ionized. The ion source of the present invention is simple in structure, compact, small in size, and extremely low in energy consumption, and is particularly suitable for use on miniaturized hand-held instruments.