Atomic spectra of two-electron system: He, Hg

Principle

The spectral lines of He and Hg are examined by means of a diffraction grating. The wavelengths of the lines are determined from the geometrical arrangement and the diffraction grating constants.

Tasks

1. Determination of the wavelengths of the most intense spectral lines of He.
2. Determination of the wavelengths of the most intense spectral lines of Hg.

What you can learn about

• Parahelium
• Orthohelium
• Exchange energy
• Spin
• Angular momentum
• Spinorbit interaction
• Singlet and triplet series
• Multiplicity
• Rydberg series
• Selection rules
• Forbidden transition
• Metastable state
• Energy level
• Excitation energy