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Alain PETIT: PhD in physics - Photo-ionization and spectroscopy section manager - Center d'études nucléaires de Saclay
INTRODUCTION
This text is a reworking of the article previously written by Paul BOUSQUET.
After reviewing the various processes by which radiation interacts with matter, we'll examine optical and X-ray spectra in turn, starting with the simplest spectrum, that of the hydrogen atom.
As we shall see, atomic spectroscopy has provided us with extremely precise knowledge of the external electronic configurations of atoms, which are highly varied and determine the chemical properties of the elements. X-ray spectra, for their part, reflect the internal electronic configurations of atoms; we shall see, among other results, that their characteristic shape is direct evidence of the arrangement of these electrons in successive layers.
The study of molecular spectra is the subject of article P 2 656.
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Theory of atomic spectra
The different processes of radiation-matter interaction
References
Quantum physics
- (1) - FEYNMAN (R.P.) - Cours de physique (partie Mécanique Quantique) (1979), Interéditions.
- (2) - COHEN-TANNOUDJI (C.), DIU (B.), LALOË (F.) - Mécanique quantique I et II, - collection enseignement de Sciences, édition Hermann (1986).
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