K alpha double splitting of molybdenum X-rays / fine structure

Principle

The polychromatic molybdenum X-ray spectrum is analyzed by means of a monocrystal. The energy of the characteristic lines is determined from the positions of the glancing angles at various orders of diffraction. The separation of the Ka doublet in higher order diffraction is examined.

Tasks

1. Record the intensity of the X-rays emitted by the molybdenum anode as a function of the Bragg angle using a LiF monocrystal as analyzer.
2. Determine the wavelengths and ratio of the intensities of the two Ka lines in high order diffraction and compare your results with  the theoretical predictions.

Learning objectives

• Characteristic X-ray radiation 
• Energy levels
• Selection rules
• Bragg equation
• Energy term symbols