<P> Others include glow discharge, field desorption (FD), fast atom bombardment (FAB), thermospray, desorption / ionization on silicon (DIOS), Direct Analysis in Real Time (DART), atmospheric pressure chemical ionization (APCI), secondary ion mass spectrometry (SIMS), spark ionization and thermal ionization (TIMS). </P> <P> Mass analyzers separate the ions according to their mass - to - charge ratio . The following two laws govern the dynamics of charged particles in electric and magnetic fields in vacuum: </P> <Dl> <Dd> F = Q (E + v × B) (\ displaystyle \ mathbf (F) = Q (\ mathbf (E) + \ mathbf (v) \ times \ mathbf (B))) (Lorentz force law); </Dd> </Dl> <Dd> F = Q (E + v × B) (\ displaystyle \ mathbf (F) = Q (\ mathbf (E) + \ mathbf (v) \ times \ mathbf (B))) (Lorentz force law); </Dd>

A neutral molecule will travel in a path in a mass spectrometer