Atoms, Molecules and Photons by Wolfgang Demtröder

Author:Wolfgang Demtröder
Language: eng
Format: epub
ISBN: 9783662555231
Publisher: Springer Berlin Heidelberg

(7.106)

which become increasingly dense with increasing principal quantum number n. They are caused by transitions from level into bound Rydberg levels. The series converges for towards the ionization limit of the atom. For the continuous part of the spectrum appears where the atom is photoionized.

The ions can be collected on the detector with an efficiency of 100% by a small electric field. The number of collected ions is a measure for the number of absorbed photons.

For a density of absorbing atoms the measured ion rate is

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