Patent ID: 9530631
Filing Date: 2016-12-27
CPC Classification: H01J

Claim Text:
1. A miniature mass spectrometer comprising: an atmospheric pressure ionisation source; a first vacuum chamber having an atmospheric pressure sampling orifice or capillary, a second vacuum chamber located downstream of said first vacuum chamber and a third vacuum chamber located downstream of said second vacuum chamber; an ion detector located in said third vacuum chamber; a first RF ion guide located within said first vacuum chamber; a second RF ion guide located within said second vacuum chamber; wherein the ion path length from said atmospheric pressure sampling orifice or capillary to an ion detecting surface of said ion detector is ≦400 mm; wherein the mass spectrometer further comprises: a tandem quadrupole mass analyser, a 3D ion trap mass analyser, a 2D or linear ion trap mass analyser, a Time of Flight mass analyser, a quadrupole-Time of Flight mass analyser or an electrostatic mass analyser arranged in said third vacuum chamber; wherein the product of the pressure P wherein the product of the pressure P