mass detection electrospray ionisation quadrupole detection A mass detection method where the sample is either forced through a small heated capillary (at a flow rate of 1–10 L min-1) into an electric field to produce a very fine mist of charged droplets, or solvent droplets subjected to the same process are directed at the sample. The ions are then characterised by a mass-to-charge analyser that uses a quadrupolar potential (generated by four parallel electrodes) to constrain the trajectories of ions according to their mass-to-charge ratio. 2009-09-03T11:27:40Z https://orcid.org/0000-0001-5985-7429 ESI Q Trap ESI-Q-TRAP CHMO:0002337 ESI Q-TRAP