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The radiative vacancy transfer probabilities from the [L.sub.3] subshell to the M and N subshells for Sm and Eu and their compounds have been measured using L shell fluorescence yields and X-ray intensity ratios. The samples were excited by 59.5 keV [gamma]-rays, which were emitted from an Am-241 radioisotope source. The L X-rays emitted from samples were counted by a Si(Li) detector with a resolution of 155 eV at 5.9 keV. The experimental values were compared with the calculated theoretical values for pure Sm and Eu. Key words: X-ray fluorescence, chemical effect, vacancy transfer probabilities. Nous utilisons les rendements de fluorescence de la couche L et les rapports d'intensite X, pour mesurer la probabilite de transfert lacunaire radiatif de la sous-couche [L.sub.3] aux sous-couches M et N de Sm et de Eu et de leurs compose. Les echantillons sont excites par des rayons [gamma] de 59.5 keV produits par une radiosource de [sup.241]Am. Les rayons X L emis par les echantillons sont comptes a l'aide d'un detecteur Si(Li) d'une resolution de 155 eV a 5.9 keV. Nous comparons nos resultats avec les valeurs theoriques calculees pour des echantillons de Sm et d Eu purs. [Traduit par la Redaction] Mots-cles: fluorescence X, effet chimique, probabilites de transfert lacunaire., 1. Introduction X-ray fluorescence (XRF) is a well-established nondestructive analytical technique of X-ray emission spectroscopy. This technique is a powerful tool for rapid multi-element nondestructive analyses and enables simultaneous detection [...]

An alternative method for determining the lock-in angle phi(sub L) for pinning of the vortices on extended defects was developed. The method significantly reduces the uncertainty in determining the lock-in angle when compared to all the other employed methods.

The first structurally characterized f-element TFSI complex [La(TFSI)3(H2O)3], the synthesis and spectroscopic characterization of the analogous Sm(super III), La(super III) and Eu(super III) complexes are reported. It is found that the lanthanide in all three complexes was shown to be reducible to the metallic state in [Me3N(super n)Bu][TFSI].

Al2O3-SiO2 glasses were prepared for doping with Sm(super3+) ions using a sol-gel method followed by X-ray irradiation, in which formation of the Sm(super 2+) ions and persistent spectral hole burning (PSHB) are investigated. The X-ray irradiation brought about hole centers in the oxygen ions bound with Al(super 3+) ions.

The homogeneous sputtered 500 nm thick SmCo(sub x) (x = 5 - 26) thin films with excess Co is compared to SmCo5. Sample with x = 12 possesses the optimum value of 19 mGOe (151 kJ/(super 3)) for the maximum energy product after a 30 s anneal at 700 degree C.

A study related to the reduction of a series of [alpha]-cyanostilbenes with Sm[I.sub.2] in THF in the presence of various proton donors is reported. The results offer guidelines for the appropriate use of proton donors such as MeOH, water and ethyleneglycol which complex to Sm[I.sub.2] and noncomplexing proton donors like TFE, i-PrOH and t-BuOH, to induce reaction.

Samarium oxide or samaria (Sm2O3) nanowires and nanoplates, with a single unit cell thickness (1.1nm), are synthesized. These rectangular shaped nanowires and nanoplates are synthesized from the thermal decomposition of hydrated samarium(III) acetate in the presence of oleylamine and a long-chain carboxylic acid under argon atmosphere.