field-free region

field-free region

A region in the flight path of an ion from the source of the mass spectrometer through the mass analyser to the detector which has no specific magnetic or electric field, as occurs in the ion path between the electric and magnetic analysers in a double-focusing mass spectrometer, or between the source and the first sector of single- and double-focusing mass spectrometers.

Unimolecular ion dissociations in these regions may give rise to signals in the mass spectrum recorded under normal conditions (metastable ions), or can be specifically analysed.
References in periodicals archive ?
Perhaps a more immediate concern is the possible causal relationship between field-free regions having high potentials and the anomalous adverse health changes that have been observed in such regions.

Full browser ?