title: Demonstration of selected ion flow tube MS detection in the parts per trillion range.
abstract: The rate coefficients of the ion-molecule reactions between H3O+, NO+, O2+, and phosphine were determined using a selected ion flow tube. Using these data, the selected ion flow tube mass spectrometry (SIFT-MS) method was applied to the real-time measurement of phosphine in nitrogen without sample preparation down to concentrations in the mid parts per trillion range. This is the first reported measurement using SIFT-MS in the parts per trillion range. Linear dependencies on concentration were found from 190 ppt to the ppm range, and the limit of detection for a 10-s scan was 190 ppt (0.27 pg/mL).
authors.affiliation: Syft Technologies Ltd., P.O. Box 28149, Christchurch, New Zealand.
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Milligan
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Francis
authors.forename: Barry J
authors.initials: BJ
authors.lastname: Prince
authors.forename: Murray J
authors.initials: MJ
authors.lastname: McEwan