Laser induced x-ray fluorescence of Be{sup 2+} ions
Conference
·
OSTI ID:226921
- A.F. Ioffe Physico-Technical Inst., St. Petersburg (Russian Federation)
Fluorescence of Be{sup 2+} ions in the soft x-ray range induced by visible laser light was observed in an expanding laser plasma (LPP). As it was shown, LPP in the far zone of expansion presents a unique combination of extremely low electron temperature and high concentration of multicharged ions. The process of three-body recombination of ions and low energy electrons, going via highly excited states, leads to population of a considerable number of states, some of which are metastable. Our theoretical evaluation of the population of the metastable ls2s {sup 1}S state in the helium-like Be{sup 2+} ion showed that at plasma parameters typical for a distance of 5 cm from the target (Te = 0.1 eV and Ne = 10{sup 14}cm{sup -1}) this value could be three orders of magnitude higher than that for the ls2s {sup 1}P state. This fact inspired us to perform an experiment on the excitation of the ls2s {sup 1}S - ls2s {sup 1}P transition by a laser radiation with observation of the ls{sup 21}S - ls2s {sup 1}P soft x-ray fluorescence. The radiation wavelength corresponding to the ls2s {sup 1}S - 1s2s {sup 1}P transition in Be{sup 2+} is 614.2 nm and can be easily obtained with a conventional dye laser. The lifetime of the ls2s {sup 1}P state is determined mainly by radiative decay to the ground state ls{sup 21}S with a probability of 10{sup 11}c{sup -1}. Due to this fact the excitation of the ls2s {sup 1}P state is followed by immediate emission of an x-ray photon with an energy of 124 eV ({Lambda} =10 nm). Angular distribution of this radiation, its polarization and duration are determined mainly by properties of the exciting laser beam and plasma parameters.
- OSTI ID:
- 226921
- Report Number(s):
- CONF-950749--; CNN: Contract 93-02-16904
- Country of Publication:
- United States
- Language:
- English
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