منابع مشابه
Optical Properties and Optical Spectroscopy of Rare Earth Ions in Solids 2.1 Electron–Phonon Coupling in Solids
The Franck-Condon principle plays an important role in understanding the nature of optical transitions in laser-active ions in solids. According to this principle, absorption of a photon is an instantaneous process during which the nuclei are enormously heavy as compared to the electrons. In other words, the electronic transition occurs on a time scale that is short compared to nuclear motion, ...
متن کاملOptical Properties and Optical Spectroscopy of Rare Earth Ions in Solids 2.1 Electron–Phonon Coupling in Solids
The Franck-Condon principle plays an important role in understanding the nature of optical transitions in laser-active ions in solids. According to this principle, absorption of a photon is an instantaneous process during which the nuclei are enormously heavy as compared to the electrons. In other words, the electronic transition occurs on a time scale that is short compared to nuclear motion, ...
متن کاملMicrobial mobilization of rare earth elements (REE) from mineral solids—A mini review
In the light of an expected supply shortage of rare earth elements (REE) measures have to be undertaken for an efficient use in all kinds of technical, medical, and agricultural applications as well as—in particular—in REE recycling from post-use goods and waste materials. Biologicallybased methods might offer an alternative and supplement to physico-chemical techniques for REE recovery and rec...
متن کاملControlling fluorescence lifetime of rare-earth element in amorphous inorganic solids via very small compositional adjustments
Fluorescence lifetime of hypersensitive 4f-4f transitions of rare-earth elements embedded in amorphous inorganic solids can be dramatically modified by compositional adjustment of the hosts tantamount to not more than 1 mol % without any elaborated thermal treatments. It is possible to modify a spontaneous emission rate of Dy3+: F11/2 , H9/2 → H15/2 transition in chalcogenide Ge– As–S glasses t...
متن کاملSymmetry-Modelling of Rare Earth Compounds with Kramers Ions: II. Erbium(III) in Various Solids
The »truncated crystal field method« which allows determination of the microsymmetry of the crystal field around Kramers . ions is applied to erbium(III) in five different host crystals. The starting data for the calculations are taken from carefully interpreted optical spectra. In the first step, crystal field narameters for various assumed test symmetries are chosen in order to give the best ...
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ژورنال
عنوان ژورنال: Nature
سال: 1972
ISSN: 0028-0836,1476-4687
DOI: 10.1038/239237b0