Dual field multipole converging ion guides, hyperbolic ion guides, and related methods

摘要

An ion guide generates a first RF field of Nth order where N is an integer equal to or greater than 2, and a second RF field of 2Nth order superimposed on the first RF field. The first and second RF fields may be generated by respective first and second sets of electrodes. Another ion guide may include a converging entrance section followed by an exit section. The converging section may have a hyperbolic profile. A hyperbolic profile may be presented by electrodes having a twisted configuration relative to an ion guide axis.

主权项

1. An ion guide, comprising:
an entrance end; an exit end at a distance from the entrance end along a guide axis; a first RF field generator configured for generating a first RF field of Nth order where N is an integer equal to or greater than 2, the first RF field generator comprising a plurality of first electrodes elongated along the guide axis and circumferentially spaced about the guide axis, wherein the first electrodes surround a guide volume between the entrance end and the exit end; and a second RF field generator configured for generating a second RF field of 2Nth order superimposed on the first RF field and penetrating between the first electrodes, the second RF field generator comprising one or more second electrodes.