1. R F Brown and J H Heald, “Description and Performance of a Molecular Beam Chamber Used for Cryopumping and Adsorption Pumping Studies AEDC-TR-66-135.
2. Methods of Experimental Physics 3;Trischka,1962
3. Collisions of Electrons with Hydrogen Atoms. I. Ionization
4. Annual Reviews;Fite;Ann Rev Phys Chem,1963
5. Molecular Beams;Ramsey,1956