X-ray absorption edges usually correspond to the removal of the orbital electron to some definite outer level, not to complete ionization. The difference between this state and the state of complete removal from the metal is not known. It is probably of the order of 25 volts. By measuring the energies of photoelectrons produced by known photons the energy levels can be definitely placed. The experiment suggested is a modification of the one recently described by Kretschman (Phys. Rev. Vol. 43, p. 417).
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Eldridge, John A.
"A Method Obtaining Absolute Values for X-Ray Energy Levels,"
Proceedings of the Iowa Academy of Science, 40(1), 155-156.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/87