 Burhop was able to observe the reaction at energies of less than 8 keV . He continued his investigations of X @-@ rays and the Auger effect . He conducted investigation of the probabilities of the ionisation of the K and L shells of silver , using the Born approximation . In 1935 , he produced a non @-@ relativistic theory of the Auger effect . This followed by a relativistic treatment in 1936 with Harrie Massey , another Australian expatriate fellow at the Cavendish . His work on the Auger effect would culminate in a monograph , The Auger Effect and Other Radiationless Transitions ( 1952 ) . 
