Ions and ion traps

[electroking]

There is some air (O_2 and N_2) in the CRT. If an air molecule captures an electron,
it does become a negative ion. The trick with ion traps was to install the electron
gun slanted and straighten the path of the electrons with the magnet. The same
magnetic field acting on the heavier and slower negative ion shas a negligible effect,
and the ion just hits the first anode and is neutralized.