Principle
Thin powder samples are subjected to polychromatic X-rays. The
energy of the radiation that passes through the samples is analysed
with the aid of a semiconductor detector and a multi-channel
analyser. The energy of the corresponding absorption edges is
determined and the resulting Moseley diagrams are used to determine
the Rydberg frequency, the screening constant and the principal
quantum numbers.
Tasks
- Calibration of the semiconductor energy detector with the aid
of the characteristic radiation of the calibration sample.
- Recording of the energy spectra of the polychromatic X-rays
that pass through the powder samples.
- Determination of the energy of the corresponding K-
and L-absorption edges.
- Determination of the Rydberg frequency, screening constants,
and principal quantum numbers with the aid of the resulting Moseley
diagrams.
What you can learn about
- Bremsstrahlung
- Characteristic X-radiation
- Absorption of X-rays
- Bohr's atom model
- Energy levels
- Moseley's law
- Rydberg frequency
- Screening constant
- Semiconductor energydetectors
- Multichannel analysers
Software included. Computer not provided.
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