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

A comparison of different experimental configurations in pulsed laser induced molecular fluorescence

“…(3) detectors for thin-layer chromatography (15) and high pressure liquid chromatography (16,17); (4) detection of trace contaminates in solids (18,19); (5) detection of trace species in solution by fluorescence techniques (20)(21)(22)(23)(24)(25)(26).…”

Comparison of calcium fluoride and lanthanum fluoride as host lattices for the determination of lanthanides by selective excitation of probe ion luminescence

“…Interference Effects. It has been previously shown that Na(I) present in the CaF2:Er3+ precipitation solution in concentrations as low as 1-10 Mg/mL causes the appearance of ErIII-NaI cluster sites in the erbium spectrum, as well as broadening of the G1 site lines, while increasing the G2, G3, and G4 site concentrations (6). The presence of CT, Li+, and H+ has also been shown to affect the erbium site distribution in CaF2 (3,6).…”

“…It has been previously shown that Na(I) present in the CaF2:Er3+ precipitation solution in concentrations as low as 1-10 Mg/mL causes the appearance of ErIII-NaI cluster sites in the erbium spectrum, as well as broadening of the G1 site lines, while increasing the G2, G3, and G4 site concentrations (6). The presence of CT, Li+, and H+ has also been shown to affect the erbium site distribution in CaF2 (3,6). To counteract these effects, a Li+/K+ buffer was developed, followed by a study of the interference effects of 30 different cations and 7 anions upon the buffered CaF2:RE3+ precipitate (3).…”

“…GA-8, Metricel, Gelman Sciences, Inc., Ann Arbor, MI), rinsed with deionized water, and set aside to dry overnight under a dust cover. The precipitates are ignited in platinum crucibles for 3 h at 530 °C in a Lindberg Lab Box Furnace, Model 51844 (Lindberg Co., Watertown, WI), which was found to reach the final temperature in 10 min (6). The ignited precipitates are ground to a fine powder and stored in glass vials.…”

Charge Compensation of Er3+ Ions in Ca1—xErxF2+x Thin Films at Low Rare-Earth Substitution Rates

“…For higher erbium concentrations x 0X002, large aggregates containing more than two rare-earth ions (clusters D) were also evidenced. If oxygen participates in the charge compensation of the Er 3 ions, additional centers can be observed from PL measurements [3,5,7,8,10]. In particular, an O 2À ion can substitute a F À ion at one of the corners of the basic cube surrounding the Er 3 ion.…”