Interpretation Of The Spectra Of Rare Earth Crystals

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Optical properties of single crystals of some rare-earth

crystals and polarized synchrotron radiation me can study the anisotropy of the optical properties. Jn the energy range investigated, the spectra are determined by valence-to-conduction-band tran-sitions, as mell as transitions from the rare-earth 4f and 5P core levels. Since band struc-tures are lacking, a preliminary interpretation

University of Canterbury

THESIS The white man drew a small circle in the sand and told the red man, Tbi s is what the Indian knows , and drawing a big circle around the small one, This is what the white

Symmetry-Modelling of Rare Earth Compounds with Kramers Ions

Interpretation of the optical and magnetic phenomena of single crystals containing rare earth ions is usually done within the framework of crystal field theory. Due to the semiempirical nature of this theorv, model-dependent crystal field parameters are introduced. Determination of these parameters

EPR Study of Cr Pure and Co -Doped YAlO Single Crystals

efficiency of the rare-earth-doped YAP crystals [13]. It was assumed [9, 13, 14] that possible reasons for the as-grown YAP crystals coloration may be due to the growth of point defects such as vacancies, anisite ions, and {Y Al} sites. Such defects may form due to deviations of the crystal composition from the stoichiometric one, i.e., with

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1. Spectra of Molecular Hydrogen and Its Isotopes 2. Rare Earth Crystal Spectra 3. Theoretical Spectroscopy 4. Rare Earth and Uranium Free Ion Spectra 5. Publications This research was carried out under the direction of G. H. Dieke until his death in August, 1965. Between this date and November 1, 1967,

Theory of the Nuclear Hyperfine Structure of Paramagnetic

ture of the rare earth salts, it is better to leave the discussion of the theory until more is known concerning the relative importance of the various effects. Indeed, there is considerable variation within the iron group itself. In divalent manganese, for instance, the nuclear splitting is of the same order of magnitude as the

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All dopant levels exhibited different CL spectra with evidence for lines due to the rare-earth dopants intra-4f transitions. The temperature dependence of the intensity of the emission band is discussed. Keywords: Cathodoluminescence, rare earth, Bi 4Ge 3O 12 Introduction The bismuth germanate- Bi 4Ge 3O 12 (BGO) single crystals have wide

Spin-Resonance Properties of Scheelites. I. Vanadium in CaW04*

mental results and defer the theoretical interpretation to a later paper. A brief account of V in CaW04 was given earlier.l2 II. EXPERIMENTAL PROCEDURE The crystals were grown by the Czochralski technique in an apparatus similar to that described by Nassau and Broyer,13 Optical-grade calcium tungstate, rare-earth

Optical Spectroscopy - HIGP

near-infrared region. The spectra they produce are often called either crystal-field spectra or ligand-field spectra after the theories used to describe them. They are a major cause of color in many minerals and are, by far, the most studied. 2) Electronic transitions which involve displacement of charge density from one ion to another.

VUV spectroscopy of nominally pure, Tm3+ and Mn doped LiCaAlF

Luminescence study of LiCAF crystals using synchrotron radiation has been carried out in order to characterise its intrinsic optical properties as well as those induced by doping with rare-earth (Tm3+) and transition metal (Mn2+) ions. Nominally pure, Tm3+ and Mn2+ doped LiCAF single crystals have been grown at the Institute of

Aerospace Research Laboratories

2. Thermoluminescence and Fluorescence from Rare Earth Doped Crystals 58 3. Emission from OR 1, OR4 60 4. Emission from FI 1, FI 2, N 1, and PE2 60 E. Excitation Spectra and Optical Absorption 65 1. Spectra for 0R2, OR1, and 0R7 69 2. Spectra for OR4 (Including Relative Excitation) 72 3. Optical Absorption 76 4. Conclusions 76

Analysis of the spectra of trivalent erbium in multiple sites

spectra and Van Vleck paramagnetism in Er3+:YAlO 3, J. Appl. Phys. 105(2), 023112 (2009). 1. Introduction Interest in the detailed interpretation of the spectroscopic properties of wide band gap semiconductors such as the III-nitrides GaN and AlN doped with trivalent rare earth ions

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Jun 26, 2020 spectra was obtained by taking into account relativistic interactions and correlation effects of spin-orbit interactions. Adjustable parameters of the interactions included into the Hamiltonian were found. 1. Introduction The theory of the energy levels of iron-group and rare-earth paramagnetic ions with open d and f shells

M Centres in Alkaline Earth Fluorides

Our crystals contained iron group and rare earth ions with concentrations of at least 1016/cM3 and caution was necessary in the interpretation of fluorescence spectra (see ? 4.2). 3. POLARIZATION OF OPTICAL ABSORPTION 3*1. Effects of bleaching with polarized light The optical absorption of cubic crystals containing anisotropic defect centres is

TEMPERATURE DEPENDENCE OF ENERGY TRANSFER BETWEEN RARE EARTH

The temperature dependence of energy transfer between rare earth ions in Y3Al50 12, Y3Ga50 12 , and LaF3 crystals is investigated at temperatures between 4.2° and 77°K. A sharp exponential decrease of the interaction probability is observed near helium temperatures. The decrease is explained as being

High-density scintillating glasses for a proton imaging detector

crystals due to their cost effectiveness [8] and flexibility to be molded into various geometries. Most of the previous work done on scintillating glasses and crystals have focused on using rare earth cations, Cerium, Terbium, and Europium, as activators. They also include rare earth metals in oxideform,suchasGd2 O3 forglassandGd2 SiO5

Visible and short wave infrared reflectance spectroscopy of

35 Monazite, LnPO4, is composed primarily of the light rare earth elements (LREE) from La 36 through to Gd. Xenotime, also LnPO4, is composed primarily of the heavy rare earth elements (HREE) 37 from Gd through to Lu and including Y. Despite their similar compositions, monazite and xenotime 38 crystallize in different space groups.

THE METHOD OF ELECTRON PARAMAGNETIC RESONANCE FOR QUANTUM

dependences of the EPR spectra of all three ions. The orientation of the local magnetic axes of paramagnetic centers relative to the YAlO 3 crystallographic directions are shown to depend on the actual rare-earth species. The direction of the z axis relative to the a axis in the ab plane is 41.4 0 for Er 3+, 30.5 for Nd 3+ and 31.8 0 for Ce 3

Absorption spectrum and Zeeman effect of dysprosium ethylsulfate

Turning to the theoretical explanation of the rare earth spectra, it seems natural now to aooumc, as sugccnted by Hund'a success in identifying the spectrographic ground states, that the rare earth spectra are mainly characterized by the free ion spectra, slightly modified by the inclusion of the ions in crystals. Suggestions to this effect were

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this effect in actinide crystals than in rare earth crystals. 3+ 3 The ground configuration of U is 5f , Since nothing is known experimentally about the free ion spectrum of U 3+, we have made calculations on the 5f 3 configuration to aid in the interpretation of crystal spectra.

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techniques. The relaxation spectra of many systems previously thought to be quite simple, are found actually to be very complex. For example, seven relaxations are observed in rare earth doped calcium fluoride (Andeen et al. 1981). In order to aid in the interpretation of the data, the authors have developed computer simulation

R2 =Pr, Eu, Gd)

rare-earth series will be discussed. The polarized Cu X-edge results reported by Tan et al. on the Pr2 Ce Cu04 is particularly interesting. They interpreted their results in terms of a Ce doping in-duced almost rigid shift in the Elc spectra and produc-tion of a new d' feature in the E~~c spectra. Thus, they proposed that the upper unoccupied

Fast 2D Laser-Induced Fluorescence Spectroscopy Mapping of

several absorption and luminescence peaks, which complicated the interpretation of obtained spectra. However, a combination of the HSI and LIF techniques proved to be beneficial for the identification of rare earth elements in these materials. These studies focused mainly on spatially homogeneous, small samples with high amounts of

Raman spectra of R 2O3 (R rare earth) sesquioxides with C

Raman spectra of R 2O 3 (R rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study M. V. Abrashev,1,2,a) N. D. Todorov,2 and J. Geshev1 1Instituto de Fısica, UFRGS, Porto Alegre, 91501-970 Rio Grande do Sul, Brazil

LOCAL STRUCTURE OF S-STATE RARE EARTH IONS IN FLUORIDES AND

in this work local structure of s-state rare earth ions (Gd3+ and 2+e) u is investigated with electron paramagnetic resonance (r) spectroscopy eP technique in cf 3 and Bas 2 f 8 single crystals as well as in oxyfluoride glass y ceramics containing Mef 2 (Me = ca, Ba, sr) crystallites. ePr spectra parameters at different temperatures for

Recent advances in x-ray absorption spectroscopy

dichroism. Fundamental aspects of the spectroscopy are clarified for rare earth crystals. The determination of the ground state properties and the detailed understanding of the underlying mechanisms was obtained by comparison of the experimental data to state-of-the-art ab initio calculations.

REE, U, TH, AND HF DISTRIBUTION IN ZIRCON FROM WESTERN

Zircon crystals, nominally ZrSiO 4, are much more complex than their formula implies. Zircon incorporates other important trace elements besides U and Th into its structure, for example rare earth elements (REE), Y, P and Hf. Although there is a complete solid solution between zircon and hafnon (HfSiO 4), the Hf content of most

Physics Bulletin BOOK REVIEWS Related content Spectra and

Spectra and Energy Levels of Rare Earth Ions in Crystals To cite this article: D W Goodwin 1969 Phys. Bull. 20 525 View the article online for updates and enhancements. Related content Electron Spin Resonance G R Luckhurst-Proceedings of the 20th EGAS Conference of the European Group for Atomic Spectroscopy L Windholz-Spectrograph design, 1918-68

INTERNATIONAL CONFERENCE ON SPECTROSCOPY

*Absorption spectraofactivated nitrogen, oxygen o andhalogensinthe600-1100Aregion 59 A.E. Douglas *New spectra of oxygen and oxygen-like molecules 93 KurtDressler New interpretation of the ^^ and 1HU Rydberg and valence states of nitrogen below the first ionization limit 97 I. Kovacs Rotational structure of the spectra of diatomic

Correlation of spectral and heat-capacity Schottky

A self-consistent interpretation of the Raman and infrared spectra and the heat-capacity measurements on Dy,oJ' Er,oJ' and Yb,03' which have the cubic (bixbyite) structure, is presented. New spectra recorded at 10, 80, and 300 oK on oriented single crystals of each oxide are compared with published spectral data and interpretations.

Introduction to a theory of magneto-optic phenomena in crystals

§ I. Remarks on the nature of the absorption spectra in crystals of rare earths. It is known. that crystals show different absorption spectra according to the orientation of the light vibration (electric vector) in the interior of the crystal 1) In uniaxial crystals two principal spectra exist: the ordinary

Cathodoluminescence of Rare Earth Doped Zircons. I. Their

the complex CL emission spectra of natural zircon crystals and the nature of the REE present at trace levels. In this study, the raw CL data are not corrected for the response function of the instrnment and only qualita­ tive interpretation of the spectra are cortsidered. The

PHYSICAL REVIEW B99, 165101 (2019)

also a quantitative interpretation of the spectra is actually very challenging. This is not only because of the presence of strong electron correlations but also because the spectra cannot be interpreted in terms of a weighted sum of the transition metal 3d, oxygen 2p, and/or rare-earth 4f spectral

On the luminescence origin in Y2SiO5:Ce and Lu2SiO5:Ce single

responsible for the luminescence of these crystals is clarified and a new interpretation of their luminescence spectra is proposed. The suggestion is made that the dominating violet doublet emission band arises from the Ce3+ ions substituting for the host crystal lattice rare-earth

Preparation and properties of crystalline potassium chloride

Analysis of the Crystals for Rare Earth Content 26 Measurement of Ionic Conductivity 27 Coloration and Optical Measurements 29 III. RESULTS AND DISCUSSION 31 Uncolored Crystals 34 Ultraviolet Absorption Spectra 34 Ionic Conductivity 36 Additively Colored Crystals 40 Ultraviolet Absorption Spectra 40 Absorption Spectra in the

Cathodoluminescence and microprobe study of rare-earth

phors used in fluorescent lights, and rare-earth-activated fluorapatite has been synthesized for solid-state laser crystals. Emission spectra for most of the activators in apatite are well documented in the literature (e.g., Mari-ano, 1978), and interpretation of CL emission spectra in apatite has been made by correlation with work on syn-

Anisotropic Optical Properties of Heavy-Rare-Earth Single

Anisotropic Optical Properties of Heavy-Rare-Earth Single Crystals Abstract The optical absorptivities of oriented single crystals of hcp Gd, Tb, Dy, Ho, Er, Tm, and Lu were measured at 4.2 K between 0.2 and 4.4 eV. Polarized radiation was used to reveal the optical anisotropy. Systematic

Analysis of the electron excitation spectra in heavy rare

spectra of high energy incident electrons (75 keV) transmitted through thin foils of yttric rare earth elements (gadolinium to lutetium in the periodic classification) prepared in various chemical states (metal, hydride and oxide) and which have been previously checked by standard X-ray and electron diffraction techniques.