Patent ID: 9412576
Filing Date: 2016-08-09
CPC Classification: H01J

Claim Text:
1. An ion trap mass spectrometer using a cold electron source, which uses a device configured to acquire an ionization source using an microchannel plate (MCP) and a channeltron electron multiplier (CEM), in which ultraviolet photons radiated from an inside of a mass spectrometer vacuum chamber in a high vacuum state induce initial electron emission, gaseous molecules are ionized through an electron beam obtained by amplifying the electrons, and ions are detected, the ion trap mass spectrometer comprising: an ultraviolet diode which emits ultraviolet rays to the inside of the mass spectrometer vacuum chamber; an MCP module which induces initial electron emission of ultraviolet photons emitted from the ultraviolet diode, amplifies the emitted electrons, and obtains an electron beam at a back plate, wherein a voltage in a range of −2800 to −4000V is applied to a front plate, and an identical voltage in a range of −2000 to −3000 V is applied to the back plate together with a front electrode of a CEM module; a CEM module which amplifies the electron beam emitted from the MCP module, and obtains an electron beam in quantity; an electron focusing lens which is horizontally arranged in parallel to an ion trap mass separator fron electrode and focuses the electron beam amplified through the CEM module; an ion trap mass separator which sequentially includes a front electrode, an RF electrode, and a back electrode, and ionizes the gaseous sample molecules using the electron beam injected through the electron focusing lens, and captures the ionized gaseous sample molecules in a certain space; an ion filter including a mass separator back electrode of the ion trap mass separator, a quadrupole field ion filter electrode, which prevents a secondary ionization at the outside of the ion trap mass separator when electrons proceed after passing through the ion trap mass separators, and an exit electrode, the ion filter preventing a loss of electrons by forming a quadrupole field when the electron beam injected through the electron focusing lens passes through the ion trap mass separator and proceeds; and an ion detector which detects ions separated from the ion trap mass separator based on a mass spectrum, wherein each of the components is provided in a vacuum chamber having a pressure in a range of 10