Energy Levels of Sm²⁺ in BaClF and SrClF Crystals under Magnetic Field I. Theory

Abstract

The theoretical models and their accompanying procedures described in the first paper of this series are applied to the interpretation of the fluorescence spectrum under magnetic field of Sm2+ in BaClF and SrClF. The good agreement between theory and experiment testifies to the quality of the parameters involved in the zero-field Hamiltonian.Les modbles theoriques et leurs procedures daccompagnement dhcrits dans le premier article de cette aerie sont appliques L l'interpretation du spectre de fluorescence SOUB champ magnbtique de Sm2+ dans BaClF et SrCIF. Le bon accord entre theorie et experience atteste de la qualit6 des parambtres intervenant dans le hamiltonien en champ nul.

Energy Levels of Sm2+ in BaClF and SrClF Crystals under Magnetic Field II. Results

“…As a typical example, we get D[(15) 6E,] = 3.18 for SrClF:Sm2+ to be compared with the value D[(15) 6E,] = ---9.51 in Table 2. In a more global fashion, we refitted our two experimental zerofield spectra by taking the eight additional parameters D[(lk,) W(C,,)] as given by (Al) and (A2) in [3] and by (4) and by freely varying the spin-orbit parameter D[(ll) OA,] and the five crystal-field parameters D[(Ok) W(CmV)]. As a net result, the deviation f increases to the values 1.15 and 1.34 for BaC1F:Sm2+ and SrClF: Sm2+, respectively.…”

“…This result corroborates the well-known inadequacy of the parameter ratios deduced from the electrostatic model. We now comment on the results concerning the action of a 5T magnetic field and obtained according to steps 3 and 4 of the diagonalization and optimization procedures described in [3]. The theoretical positions of each energy level with respect to the zerofield center of gravity of the multiplet 7FJ from which the level arises were calculated for BaC1P:Sm2+ and SrC1F:Sm2+.…”

“…As a continuation of a previous series of works on the fluorescence spectra of the ion Sm2+ in halofluorides [l, 21, we study the effects of a magnetic field on the 5Do,1,2 --* + 'F, ( J = 0 to 6) emission lines observed, a t low temperature, in the BaC1P:Sm2+ and SrClF : Sm2+ fluorescence spectra. The theoretical determination of the Sm2+ energy levels in both crystals is conducted according to the procedures described in the first part of this study [3]. The crystal-field parameters are optimized from the experimental zero-field energy levels arising from the multiplets 7F, ( J = 0 to 6 ) .…”

Addition de photons par transfert d'énergie et absorption dans l'état excité dans les matériaux MClF: Sm+2 (M = Ba, Sr)

“…L'ion Sm + 2 se substitue dans les phases MC1F a l'ion M+2 en un site de sym6trie C4v. La determination expérimentale et th6orique des niveaux Stark issus de 1'eclatement des premiers termes 'F et 5D de la configuration fondamentale 4£6 dans les composes BaCIF : 5 °/°° Sm+2 et SrCIF : 1 °/o° SM12 ainsi que 1'etude de 1'action d'un champ magn6tique sur ces memes niveaux ont fait l'objet de travaux r6cents [8][9][10][11][12].…”