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The Mass Spectrometer. In order to measure the characteristics of individual molecules, a mass spectrometer converts them to ions so that they can be moved about and manipulated by external electric and magnetic fields. The three essential functions of a mass spectrometer, and the associated components, are:
Answer Wiki. Neutron-photon scattering has a small cross-section because the neutron is electrically neutral, but it does happen. When it happens, itâs really nothing special: the photon and the neutron exchange energy-momentum, bounce off each other, and continue on their merry ways.