  Accelerator mass spectrometry (AMS) is a widely-used technique with multiple
applications, including geology, molecular biology and archeology. In order to
achieve a high dynamic range, AMS requires tandem accelerators and large
magnets, which thus confines it to big laboratories. Here we propose
interferometric mass spectrometry (Interf-MS), a novel method of mass
separation which uses quantum interference. Interf-MS employs the wave-like
properties of the samples, and as such is complementary to AMS, in which
samples are particle-like. This complementarity has two significant
consequences: (i) in Interf-MS separation is performed according to the
absolute mass $m$, and not to the mass-to-charge ratio $m/q$, as in AMS; (ii)
in Interf-MS the samples are in the low-velocity regime, in contrast to the
high-velocity regime used in AMS. Potential applications of Interf-MS are
compact devices for mobile applications, sensitive molecules that break at the
acceleration stage and neutral samples which are difficult to ionise.
