Intrinsic ion transmission of RFQ ion guides in vacuum

As part of a recent detailed overview of linear radiofrequency ion guides for the conceptualization of their efficient additions into Accelerator Mass Spectrometry (AMS), the intrinsic ion transmission properties were studied further for RF quadrupoles (RFQs) of several electrode shapes, because these are at present the only type being actively considered for use together with AMS. RFQs using hyperbolic poles, cylindrical rods, cylindrical rods plus gradient bars, and 60-30° split cylinders were studied in this work. It is found that the abilities of the first two types for securing ion transmission in vacuum are among the best although the others are quite satisfactory in some applications.