Showing papers on "Erbium published in 1977"

Ultra-trace method for lanthanide ion determination by selective laser excitation

Abstract: Conventional coprecipitation techniques have been combined with laser spectroscopy to provide a new technique for trace analysis that exhibits excellent selectivity and detectivity. The technique is here applied to lanthanide ion determinations by coprecipitating the lanthanide in calcium fluoride. A series of different crystallographic sites result for the lanthanide ions because of the charge compensation required for the Ln/sup 3 +/ substituting for Ca/sup 2 +/. Proper ignition conditions can produce an analytically useful site distribution where a single oxygen compensated site predominates. When 0.06 mol CaF/sub 2/ was precipitated from 40-mL solutions containing 50 pg/mL to 1.25 ..mu..g/mL of erbium, the fluorescence intensity from the single site was directly proportional to erbium concentration with an RSD of 8 percent. The estimated detection limit is 25 fg/mL of erbium. The technique is shown to be highly selective and free from interference from other lanthanide ions.

Relative oscillator strengths of the atomic lines of erbium

Abstract: Energy-level transitions of Er atoms are studied employing Rozhdestvenskii's method. The experiment was performed in a heated porcelain tube.(AIP)