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Bücher Englische Bücher Wissen & Bildung Naturwissenschaft, Medizin, Informatik, Technik Chemie Lasers and Excited States of Rare Earths
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Lasers and Excited States of Rare Earths
Renata Reisfeld (Gebundene Ausgabe, Englisch)
★★★★★
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Optischer Zustand
Beschreibung
The possibility of stimulated light emission was discussed by Einstein in 1917, eight years before the quantum-mechanical description of energy levels of many-electron systems. Though it is imperative to use samples having optical properties greatly different from the stan dard continuous spectrum of opaque objects ("black body" radia tion) it is not always necessary to restrict the study to… monatomic entities. Thus, spectral lines can be obtained (in absorption and in emission) from lanthanide compounds, containing from one to thir teen 4f electrons going from trivalent cerium to ytterbium, that are nearly as sharp as the ones from gaseous atoms. However, the presence of adjacent atoms modifies the simple picture of an isolated electron configuration, and in particular, it is possible to pump excited levels efficiently by energy transfer from species with intense absorption bands, such as the inter-shell transitions of other lanthanides and of thallium(I), lead(II) and bismuth(III) or the electron transfer bands of the uranyl ion or other complexes. On the other hand, it is possible to diminuish the mUlti-phonon relaxation (competing with sharp line luminescence) by selecting vitreous or crystalline materials with low phonon energies. Obviously, one cannot circumvent the conservation of energy by lasers, but they may have unprecedented consequences for the future by allowing nuclear fusion of light elements, effects of non-linear optics and time-resolved spectroscopy, besides the more conventional applications of coherent light beams with negligible angular extension. Dieses Produkt haben wir gerade leider nicht auf Lager.
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Technische Daten
Erscheinungsdatum
29.10.1977
Sprache
Englisch
EAN
9783540083245
Herausgeber
Springer Berlin
Serien- oder Bandtitel
Inorganic Chemistry Concepts
Sonderedition
Nein
Autor
Renata Reisfeld
Seitenanzahl
228
Einbandart
Gebundene Ausgabe
Bandzählung
1
Schlagwörter
Seltene Erden, electrons, Spektroskopie, Laser, optics, Lasers
Thema-Inhalt
PN - Chemie
-.-
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