Patent ID: 7960692
Filing Date: 2011-06-14
Classification: H01J

Abstract:
1. A mass spectrometer instrument, comprising: a miniature linear ion trap including at least one pair of multipole rods creating a trapping volume and applying an AC field to impose a radial pseudo-potential well on ions emitted from an ion source; the miniature linear ion trap further including: an entrance lens located at one end of the miniature linear ion trap, the entrance lens including a tubular portion extending into the trapping volume within the space bounded by the sides and ends of the rods and towards the center of the miniature linear ion trap; and an exit lens located at the other end of the miniature linear ion trap, the exit lens including a tubular portion extending into the trapping volume within the space bounded by the sides and ends of the rods and towards the center of the miniature linear ion trap; wherein a DC voltage is applied to both the entrance lens and the exit lens.