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.
Benefits
- Spectral lines of various elements can be determined with high precision
- Simple setup for high ranking experiments
- HV power supply with high safety standards makes experimentation safe
Tasks
- Determination of the wavelengths of the most intense spectral lines of He.
- Determination of the wavelengths of the most intense spectral lines of Hg.
Learning objectives
- 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
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