This focused the rays of a specific mass-to-charge ratio through a narrow slit. These were then detected in real time using an electrometer, doing away with the cumbersome photographic plates.

Sunday Times News: The atomic mass of a specific atom or molecule is determined by using an experimental technique called mass spectrometry.

Characterizing key parameters of different heparin lots requires multiple techniques. Weight-average molar mass measured by multi-angle static light scattering (MALS) and hydrodynamic radius measured ...

A 16-parts-per-trillion measurement of the antiproton-to-proton charge–mass ratio. Nature . Published online January 5, 2022. doi: 10.1038/s41586-021-04203-w.

A comparison of the charge-to-mass ratio for the proton and the antiproton has been performed with record-breaking precision — the best such test yet for a mirror-like symmetry that relates ...

An ultrasensitive experiment comparing protons with their antimatter counterparts found no difference in the ratios of their charge to mass, researchers report in the Aug. 13 Nature.