POLARIZATION DEPENDENCE OF RESONANT SOFT X-RAY EMISSION SPECTRA IN Ce COMPOUNDS

The electronic structures of Ce compounds have been investigated by means of resonant soft X-ray emission spectroscopy (RXES) excited at resonant energy range of Ce 3d → 4f absorption. Polarization dependence of the RXES shows information on concerning electronic states. In CeO 2, the Ce 4f → 3d RXES spectra are interpreted as electronic structures hybridized between 4f0 and [Formula: see text] states. Peaks appearing in the spectra are attributed to bonding, nonbonding, and antibonding states between those states, while the spectra of CeRh 3 cannot be explained by only using the hybridization between 4f0 and [Formula: see text] states. The spectra have large broad Raman peak, especially when the excitation photon energy is set at satellite of Ce 3d → 4f absorption. We attribute the origin of the broad Raman peak to hybridization states involving electron–hole pairs.

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History and Cross-Disciplinary Perspective of Compositional Imaging and Mapping With Nexafs Microscopy

Microscopy and Microanalysis ◽

10.1017/s1431927600020894 ◽

1998 ◽

Vol 4 (S2) ◽

pp. 154-155

Author(s):

H. Ade

Keyword(s):

Electronic Structures ◽

Chemical Shifts ◽

Electronic States ◽

Inorganic Materials ◽

Chemical Bonds ◽

Fundamental Physics ◽

X Ray ◽

Disciplinary Perspective ◽

Core Electrons ◽

X Ray Absorption

In Near Edge X-ray Absorption Fine Structure (NEXAFS) microscopy, excitations of core electrons into unoccupied molecular orbitals or electronic states provide sensitivity to a wide variety of chemical functionalities in molecules and solids. This sensitivity complements infrared (IR) spectroscopy, although the NEXAFS spectra are not quite as specific and “rich” as IR spectra. The sensitivity of NEXAFS to distinguish chemical bonds and electronic structures covers a wide variety of samples: from metals to inorganics and organics. (There is a tendency in the community to use the term NEXAFS for soft x-ray spectroscopy of organic materials, while for inorganic materials or at higher energies X-ray Absorption Near Edge Spectroscopy (XANES) is utilized, even though the fundamental physics is the same.) The sensitivity of NEXAFS is particularly high to distinguish saturated from unsaturated bonds. NEXAFS can also detect conjugation in a molecule, as well as chemical shifts due to heteroatoms.

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Plasma diagnostics using Kα satellite emission spectroscopy in light ion beam fusion experiments

Laser and Particle Beams ◽

10.1017/s0263034600009356 ◽

1995 ◽

Vol 13 (2) ◽

pp. 231-241 ◽

Cited By ~ 7

Author(s):

J.J. MacFarlane ◽

P. Wang ◽

J.E. Bailey ◽

T.A. Mehlhorn ◽

R.J. Dukart

Keyword(s):

Emission Spectroscopy ◽

Impact Ionization ◽

Ion Beam ◽

Emission Spectra ◽

Particle Beam ◽

High Energy ◽

Atomic Level ◽

High Energy Density ◽

Equilibrium Equations ◽

X Ray

Kα satellite spectroscopy can be a valuable technique for diagnosing conditions in high energy density plasmas. Kα emission lines are produced in intense light ion beam plasma interaction experiments as 2p electrons fill partially open Is shells created by the ion beam. In this paper, we present results from collisional-radiative equilibrium (CRE) calculations which show how Kα emission spectroscopy can be used to determine target plasma conditions in intense lithium beam experiments on Particle Beam Fusion Accelerator-II (PBFAII) at Sandia National Laboratories. In these experiments, 8–10 MeV lithium beams with intensities of 1–2 TW/cm2 irradiate planar multilayer targets containing a thin Al tracer. Kα emission spectra are measured using an X-ray crystal spectrometer with a resolution of λ/∆λ = 1200. The spectra are analyzed using a CRE model in which multilevel (NL ∼ 103) statistical equilibrium equations are solved self-consistently with the radiation field and beam properties to determine atomic level populations. Atomic level-dependent fluorescence yields and ion-impact ionization cross sections are used in computing the emission spectra. We present results showing the sensitivity of the Kα emission spectrum to temperature and density of the Al tracer. We also discuss the dependence of measured spectra on the X-ray crystal spectral resolution, and how additional diagnostic information could be obtained using multiple tracers of similar atomic number.

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Polarization Dependence of Resonant X-Ray Emission Spectra in 3dn Transition Metal Compounds with n = 0, 1, 2, 3

Journal of the Physical Society of Japan ◽

10.1143/jpsj.71.347 ◽

2002 ◽

Vol 71 (1) ◽

pp. 347-356 ◽

Cited By ~ 37

Author(s):

Masahiko Matsubara ◽

Takayuki Uozumi ◽

Akio Kotani ◽

Yoshihisa Harada ◽

Shik Shin

Keyword(s):

Transition Metal ◽

Emission Spectra ◽

Polarization Dependence ◽

Transition Metal Compounds ◽

Metal Compounds ◽

X Ray

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X-ray spectroscopy study of ThO2 and ThF4

Nuclear Technology and Radiation Protection ◽

10.2298/ntrp1001008t ◽

2010 ◽

Vol 25 (1) ◽

pp. 8-12

Author(s):

Anton Teterin ◽

Mikhail Ryzhkov ◽

Yury Teterin ◽

Ernst Kurmaev ◽

Konstantin Maslakov ◽

...

Keyword(s):

Binding Energy ◽

Energy Range ◽

Density Distribution ◽

Electronic State ◽

Electronic States ◽

State Density ◽

Molecular Orbitals ◽

Spectral Structure ◽

X Ray ◽

Electronic State Density

The structure of the X-ray photoelectron, X-ray O(F)Ka-emission spectra from ThO2 and ThF4 as well as the Auger OKLL spectra from ThO2 was studied. The spectral structure was analyzed by using fully relativistic cluster discrete variational calculations of the electronic structure of the ThO8 D4h) and ThF8 (C2) clusters reflecting thorium close environment in solid ThO2 and ThF4. As a result it was theoretically found and experimentally confirmed that during the chemical bond formation the filled O(F)2p electronic states are distributed mainly in the binding energy range of the outer valence molecular orbitals from 0-13 eV, while the filled O(F)2s electronic states - in the binding energy range of the inner valence molecular orbitals from 13-35 eV. It was shown that the Auger OKLL spectral structure from ThO2 characterizes not only the O2p electronic state density distribution, but also the O2s electronic state density distribution. It agrees with the suggestion that O2s electrons participate in formation of the inner valence molecular orbitals, in the binding energy range of 13-35 eV. The relative Auger OKL2-3L2-3 peak intensity was shown to reflect quantitatively the O2p electronic state density of the oxygen ion in ThO2.

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Effect of amino group protonation on the carboxyl group in aqueous glycine observed by O 1s X-ray emission spectroscopy

Physical Chemistry Chemical Physics ◽

10.1039/c7cp08305j ◽

2018 ◽

Vol 20 (36) ◽

pp. 23214-23221 ◽

Cited By ~ 5

Author(s):

Y. Horikawa ◽

T. Tokushima ◽

O. Takahashi ◽

Y. Harada ◽

A. Hiraya ◽

...

Keyword(s):

Aqueous Solution ◽

Amino Acid ◽

Electronic Structures ◽

Emission Spectroscopy ◽

Selective Excitation ◽

Carboxyl Group ◽

Amino Group ◽

X Ray ◽

Excitation Conditions ◽

Amino Acid Glycine

The valence electronic structures of the amino acid glycine in aqueous solution were investigated in detail through X-ray emission spectroscopy at O 1s excitation under selective excitation conditions of the CO site in the carboxyl group.

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General discussion: electronic emission spectroscopy of CF+4 and SiF+4

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences ◽

10.1098/rsta.1988.0018 ◽

1988 ◽

Vol 324 (1578) ◽

pp. 289-293 ◽

Cited By ~ 3

Keyword(s):

Emission Spectroscopy ◽

Molecular Beam ◽

Rotational Temperature ◽

Electronic States ◽

Emission Spectra ◽

Fluorescence Decay ◽

Molecular Ions ◽

Dissociation Channel ◽

Excited Electronic States ◽

Beam Electron

We report the observation of electronic emission spectra in the tetrahedral molecular ions CF+4 and SiF+4. The spectra are observed at a low rotational temperature (less than 30 K) in a crossed molecular-beam - electron-beam apparatus (Carrington & Tuckett 1980). These spectra are especially interesting because the fluorescing states in the two ions lie up to 10 eV above their lowest dissociation channel (to CF+3/SiF+3 + F; see figure 1), and these states might be expected to decay non-radiatively rather than by a radiative channel. The observation of fluorescence decay from highly excited electronic states of these polyatomic ions is therefore a very surprising phenomenon.

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Polarization dependence of X-ray emission spectroscopy

Journal of Electron Spectroscopy and Related Phenomena ◽

10.1016/j.elspec.2004.02.143 ◽

2004 ◽

Vol 136 (1-2) ◽

pp. 161-166 ◽

Cited By ~ 4

Author(s):

H. Ogasawara ◽

K. Fukui ◽

M. Matsubara

Keyword(s):

Emission Spectroscopy ◽

Polarization Dependence ◽

X Ray

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PEEM AND SXES CHARACTERIZATION ON THE SURFACE AND INTERFACE OF THE TRANSITION-METAL/SiC SYSTEM

Surface Review and Letters ◽

10.1142/s0218625x02002300 ◽

2002 ◽

Vol 09 (01) ◽

pp. 313-318

Author(s):

JOSELITO LABIS ◽

AKIHIKO OHI ◽

CHIHIRO KAMEZAWA ◽

TOSHINORI FUJIKI ◽

KENICHI YOSHIDA ◽

...

Keyword(s):

Electron Microscopy ◽

Heat Treatment ◽

Transition Metal ◽

Emission Spectroscopy ◽

Emission Spectra ◽

Photoemission Electron Microscopy ◽

X Ray ◽

Surface And Interface ◽

Photoemission Electron

The Si L2,3 and C K soft X-ray emission spectra of the interface of the Ti(50 nm)/4H-SiC(substrate) system, thermally annealed from 800°C to 1000°C and characterized by soft X-ray emission spectroscopy (SXES), revealed the formation of a reacted region composed of silicides with Ti 5 Si 3 as the majority formed species and carbides in TiC-like bonding. Also, the photoemission electron microscopy (PEEM) imaging of Ti(10 nm) film on 3C-SiC surface during in situ heat treatment showed the formation of island structures (in ring clusters) at ~ 800°C.

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Solvation dependence of valence electronic states of water diluted in organic solvents probed by soft X-ray spectroscopy

Physical Chemistry Chemical Physics ◽

10.1039/c4cp00762j ◽

2014 ◽

Vol 16 (22) ◽

pp. 10753-10761 ◽

Cited By ~ 11

Author(s):

Takashi Tokushima ◽

Yuka Horikawa ◽

Osamu Takahashi ◽

Hidemi Arai ◽

Koichiro Sadakane ◽

...

Keyword(s):

Organic Solvents ◽

Emission Spectroscopy ◽

Electronic States ◽

Absorption And Emission ◽

X Ray ◽

Organic Solutions ◽

X Ray Absorption ◽

Absorption And Emission Spectroscopy

The variety of occupied and unoccupied valence electronic states of water in organic solutions detected by X-ray absorption and emission spectroscopy.

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