MatSE 405: Microstructure Determination mselogo.jpg

Problem set #14; do not turn in.
  1. XPS systems typically use Al or Mg targets to produce soft x-rays. Calculate the wavelengths of the Ka1 and Ka2 x-ray lines of Al and Mg starting from the binding energies of the K and L core electrons.
  2. We use Cu x-ray tubes in our lab experiments but sometimes harder x-rays are desirable and then Ag is better choice. (a) What are the wavelengths of the two Ag Ka x-ray lines? (b) Calculate the x-ray absorption coefficient for Pd due to the photoelectric effect for Ag Ka and Ag Kb x-ray lines using the equation for sph included below. Include only the L and K shells of Pd in your calculation. (c) How thick of a Pd metal foil would you recommend for use as a filter to reduce the Kb intensity from a Ag x-ray source?
x-ray properties of the elements

sph = 128 p

3
e2 (h/2p)

mc

EB

E

5/2

 
1

E
(1)

e2 (h/2p)

mc
= 0.056 eV Å2
(2)



File translated from TEX by TTH, version 3.74.
On 24 Apr 2008, 09:41.