Bear with me, I am a chemist :shy: As far as I understand, every accelerating charge emits electromagnetic radiation. In mass spectroscopy charged molecules/parts of molecules move in the magnetic field which bends their trajectories using Lorentz force. That means they are accelerated, yet I have never heard about them emitting the EM radiation. That would be not much different from cyclotron radiation. Is it just a matter of the intensity and wavelength? Charged molecules in mass spectrometer are too slow and/or acceleration is to small for the radiation to be of any importance?