Before revision: History The first to study molecular beams were H. Kallmann and F. Reiche who in 1921 were interested in dipole moments and the deflection of beams of polar molecules in an inhomogeneous electric field."
After revision: History The first to study molecular beams were Hartmut Kallmann and Fritz Reiche who in 1921 were interested in dipole moments and the deflection of beams of polar molecules in an inhomogeneous electric field."