共查询到20条相似文献,搜索用时 15 毫秒
1.
Toshihiro Okajima Hiroyuki Setoyama Marek Brancewicz Masahide Kawamoto Yoshiharu Sakurai 《X射线光谱测定》2020,49(3):390-397
X-ray fluorescence spectra of copper (Cu) metal, copper monoxide (CuO), and potassium chromate (K2CrO4) were recorded as a function of incident X-ray energy near the Cu K-edge and chromium (Cr) K-edge, respectively, using a conventional silicon drift detector. The spectra contained components due to elastic, inelastic, and multiple scattering, in addition to the Kα and Kβ lines. Cu and Cr K-edge X-ray absorption fine structure (XAFS) spectra of Cu, CuO, and K2CrO4 were obtained by an intensity analysis of the Kα and Kβ lines. The intensity of the Kβ line for the different incident photon energies was obtained by numerically removing the additional scattering components using the MUSCAT program. These spectra exhibited a jump near the K absorption edges, which reproduced the spectral features obtained in transmission mode for both Cu, CuO, and K2CrO4. A chemical shift was also clearly identified in the X-ray absorption near edges structure using the X-ray fluorescence Kβ line. In addition, the Cr K-edge extended XAFS spectrum of K2CrO4 was clearly observed using the Cr Kβ fluorescent line. The XAFS measurements on the Kα and Kβ lines are possible, and they carry equally valuable information. 相似文献
2.
X-ray photoelectron spectroscopy characterization of the layered intercalated compound K2xMn1 − xPS3
Polycrystalline powders of the layered MnPS3 compound have been intercalated with K+ ions by ion-exchange to yield the K2xMn1 − xPS3 intercalate. X-ray photoelectron spectroscopy has been applied to learn about the electronic structure of this compound. In particular, we have studied the XPS spectra of the Mn 2p and 3p, P and S 2p, K 2p and 3p core levels and of the valence band region. The binding energies for various core levels of the elements present in this compound and their observed chemical shifts are analyzed. The data give evidence for the lack of non-equivalent atoms of K, Mn, P and S. Shake-up satellites are present at the Mn 2p and 3p core levels. The occurrence of such lines allows us to hypothesize that K2xMn1 − xPS3 is a large-gap insulating Mn compound. Confirmation that only an ion transfer accompanies the intercalation process is given from both the strong observed similarity with the corresponding XPS spectra in MnPS3 and the observed binding energy positions of the K 2p and 3p levels. As regards the valence band XPS spectrum, the observed analogies with the corresponding XPS spectra of the pure compound and of other K compounds have allowed us to single out two regions and their probable contributors. 相似文献
3.
M. V. R. Murti S. S. Raju B. Seetharami Reddy V. Koteswara Rao L. S. Mombaswala T. Seshi Reddy S. Lakshminarayana K. Premachand 《Pramana》2008,70(4):747-752
K X-ray emission spectra of Ti, V, Cr and Mn generated by photon excitation have been studied with a crystal spectrometer.
The measured energy shifts of Kα satellite relative to the diagram line are compared with values obtained by electron excitation and with different theoretical
estimates. The present experimental values of KαL1/KαL0 relative intensities are compared with values obtained by electron excitation.
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4.
D.T. Clark M.M. Abu-Shbak W.J. Brennan 《Journal of Electron Spectroscopy and Related Phenomena》1982,28(1):11-21
Using the substrate overlayer technique with a Ti Kα1,2 X-ray source (hν = 4510 eV) electron mean free paths λ have been determined for in situ deposited polyparaxylylene films. By monitoring the attenuation of signals arising from the substrate Au 4f, 4d, 4p, 3d and 3p core levels excited by the Ti Kα X-ray source and for the Au 4f and 4d levels excited by Cu Lα X-rays (hν = 929.7 eV) mean free paths have been determined in the kinetic energy range ~443–~59O eV. The present results are compared with those reported previously for lower kinetic energies using Mg Kα1,2 and Al Kα1,2 photon sources. The results indicate that at kinetic energies of ~4000 eV the typical sampling depth using a Ti Kα source is ~ 150 Å. 相似文献
5.
Four equidistant peaks are observed below the Kα1,2 line in the X-ray spectra of Na, Al, Si, SiO2, Ca, Sc and Ti, produced by oxygen bombardment. With much weaker intensity, these lines are also seen in proton excitation. The lines are interpreted to be due to the excitation of one or more volume plasmons in the target material by the Kα1,2 X-ray decay. 相似文献
6.
Beryllium X-ray spectra from Be and BeO targets by proton, helium, nitrogen and argon ion bombardment have been measured. In the oxide, chemical shifts of Kα and K2α X-ray lines are similar magnitude and the intense satellite KL and hypersatellite K2L lines are observed by heavy ion bombardment. 相似文献
7.
V. G. Vlasenko A. T. Shuvaev I. A. Zarubin 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(4):476-482
The electronic structure of M(CO)5Cl metal complexes (M = Mn, Re) has been investigated by X-ray emission spectroscopy. The obtained X-ray emission C Kα, OKα, Cl Kβ1, MnLα, and MnKβ5 spectra for Mn(CO)5Cl and ReLβ5 spectra for Re(CO)5Cl have been interpreted on the basis of the quantum-mechanical calculations by the method of density-functional theory, using the Gaussian-98 program. The investigation of Mn(CO)5Cl and Re(CO)5Cl showed similarity of the electronic structure of both complexes. Only small differences have been revealed in the energy structure and orbital occupancies of the atomic orbitals of the corresponding molecular orbitals; these differences are caused by the difference of the type of metal ions and the molecule geometry. On the basis of the performed quantum-mechanical calculations, theoretical X-ray emission spectra have been constructed, which reproduce well the characteristic features of the corresponding experimental spectra of M(CO)5Cl metal complexes (M = Mn, Re). 相似文献
8.
D.H. Madison K.W. Hill B.L. Doyle S.M. Shafroth R.D. Deslattes 《Physics letters. A》1974,48(4):249-251
A high resolution study of Ti Kα X-ray spectra versus projectile Z has been performed. Energy shifts and width changes were observed in both the diagram and satellite lines. These effects are explained as multiple ionization of the M shell. 相似文献
9.
R. Schmiedl I.R. Bonilla F. Paech W. Demtröder 《Journal of Molecular Spectroscopy》1977,68(2):236-252
Absorption spectra of NO2 with reduced Doppler width and resolved hyperfine structure have been obtained by crossing the beam from a single mode argon laser, tunable around 4880 and 5145 Å, with a well-collimated NO2 beam at low pressures. With the laser frequency stabilized onto selected NO2 absorption lines the fluorescence spectra of NO2 molecules in selectively populated hfs levels of an excited electronic state were examined through a grating monochromator which resolved the different rotational lines. From the fluorescence spectra the quantum numbers N′ and K′ of the emitting levels could be determined. The analysis proved that some emitting levels have K′-values differing from that of the primarily excited level. This implies radiationless transitions between different electronic states in the free molecule, which can change the value of K′ but preserve that of N′. 相似文献
10.
《Nuclear Physics A》1998,641(1):49-63
The probabilities PKK of double K-shell vacancy production per K electron capture decay and per K internal conversion of 109Cd and 207Bi have been determined by means of the double- and triple-coincidence experiments using Kα X-ray and K internal conversion. For 109Cd we find PKK(EC) = (4.2 ± 0.5) × 10−5 and PKK(IC) = (4.32 ± 0.46) × 10−5, and for 207Bi, PKK(EC) = (2.54 ± 0.50) × 10−5. The observed X-ray energy shifts of the hypersatellite Ag (Kα1H) X-ray and the hypersatellite Pb (Kα1H) X-ray lines are 545±15 eV and 1238±45 eV, respectively. 相似文献
11.
Dr. Erich Gilberg 《Zeitschrift für Physik A Hadrons and Nuclei》1970,236(1):21-41
TheKα andKβ spectra of chlorine in free molecules were studied using a special fluorescence X-ray tube and a high resolving curved crystal spectrograph with photoelectric registration. It was found that the wavelength shifts of ClKα1 obtained for various gaseous compounds do not show the regularities observed with solid compounds of other 3rd period elements. — TheKβ spectrum consists of discrete lines the most intense of which result from transitions of the lonely pair electrons of the chlorine atoms. The spectra of HCl, Cl2 and CH3Cl can be explained using optical and betaspectroscopical data and MO calculations. The general structure of ClKβ of organic compounds seems to be determined by the hybridisation type of the carbon atoms bound to the chlorine atoms. Evidence is found for a contribution of molecular vibrational energy to the energies of the X-ray transitions. 相似文献
12.
Intrinsic VK centers have been produced in single domain RbCaF3 crystals by irradiation at 77 K. The twisting of the CaF6 octahedra about the tetragonal axis as a result of the 196 K phase change is readily detected in the VK center EPR spectra. Analysis of these spectra required dividing the six distinct VK center sites on a given octahedron into two classes and determining the spin Hamiltonian parameters independently for each class. 相似文献
13.
V.A. Gubanov B.G. Kasimov E.Z. Kurmaev 《Journal of Physics and Chemistry of Solids》1975,36(9):861-869
The experimental Kβ5 and Lα emission spectra for vanadium and Kα spectra for nonmetal are studied for vanadium monoxide, nitride and carbide. Using the spectra unfolding the experimental molecular orbital diagrams have been obtained. By the semiempirical Mulliken-Wolfsberg-Helmholz method with the self-consistency on charges and configurations the calculations of electronic structure of clusters [VO6]10?, [VN6]15? and [VC6]20? have been carried out. The results of calculations are compared with the X-ray data. The effects of chemical bonding and charge densities on metal atoms in VO, VN, VC are discussed. 相似文献
14.
The electron configuration in single crystalline (sc-)titanium nitride (TiN) has been quantitatively studied using angle resolved X-ray photoelectron spectroscopy (AR-XPS). All samples were fabricated and transferred in situ so that only minimal surface contaminations were observed. The residual oxygen contamination was separated from the bulk information by extrapolating angle resolved measurements. Special attention is given to the quantitative evaluation of the spectra based on basic principles. Shake-up features are observed on core level lines and appear due two final ionized states. The ratio of this shake-up and the main Ti 2p energy line are investigated in this paper. In order to quantify this shake-up a precise evaluation is required. Here we present an approach to evaluate the XPS spectra of the Ti 2p photoemission line in TiN in a self-consistent manner that accounts for all features observable in an energy window of 80 eV. The evaluation considers the appropriate Tougaard background correction, shake-up features as well as surface and bulk plasmons. The ratio of the Ti 2p1/2 and Ti 2p3/2 and the corresponding peaks in the energy loss features fulfill the requirements given by quantum mechanics. The energy loss ΔE due to the shake-up process and the shake-up ratio have been determined quantitatively for oxygen-free bulk titanium nitride. The origin of the shake-up, its intensity and energy difference ΔE are explained by a two electron excitation process. 相似文献
15.
Harrison E. Radford F.David Wayne John M. Brown 《Journal of Molecular Spectroscopy》1983,99(1):209-220
The detection of the free radicals ClSO and FSO by the technique of far infrared laser magnetic resonance is reported. Observations of the former have been made with several laser lines; the spectra are complicated and have not been assigned but are attributed to ClSO on the basis of several chemical tests. The FSO radical was generated by the reaction of carbon disulphide with the products of a discharge through CF4 + O2. Spectra have been observed with laser lines at 394, 419 and 513 μm. Using the results of a subsequent microwave study of FSO, the rotational transitions involved in these spectra have been identified. The spectrum at 513 μm has been studied in detail and is shown to arise through level anticrossings between the levels 145,Kc (the lower levels involved in the transition) and 154,Kc+2. All aspects of this spectrum are reproduced quantitatively by the parameters determined from the microwave spectrum. It is thought that the other two FSO spectra arise in a similar manner. Such anticrossing signals are likely to be widespread in LMR experiments, causing intense narrow lines to occur at high magnetic fields even for molecules with weakly coupled electron spin. 相似文献
16.
S. Giorgianni R. Visinoni A. Gambi S. Ghersetti F. Cappellani G. Restelli 《Journal of Molecular Spectroscopy》1984,104(1):40-48
The rotational structure of CF337Cl ν1 band has been investigated using spectra of trifluorochloromethane in natural isotopic abundance, recorded with a tunable diode laser spectrometer. The spectra analyzed have been obtained by keeping the sample at low temperature (~200 K) to minimize the strong interference arising from “hot” band transitions. The K structure of many P(J) and R(J) multiplets has been resolved and positively identified: the maximum J value reached in the P and R branches was 38 and 40, respectively. About 650 unblended lines have been used for the least-squares fit to the energy expression including the quartic centrifugal distortion coefficients. Molecular constants for the ν1 band of CF337Cl have been derived. A weak perturbation affecting the rotational levels with K = 18 and J′ ≥ 36 has also been observed. 相似文献
17.
Shalendra Kumar S. GautamG.W. Kim Faheem AhmedM.S. Anwar K.H. ChaeH.K. Choi H. ChungB.H. Koo 《Applied Surface Science》2011,257(24):10557-10561
We report structural, magnetic and electronic structure study of Mn doped TiO2 thin films grown using pulsed laser deposition method. The films were characterized using X-ray diffraction (XRD), dc magnetization, X-ray magnetic circular dichroism (XMCD) and near edge X-ray absorption fine structure (NEXAFS) spectroscopy measurements. XRD results indicate that films exhibit single phase nature with rutile structure and exclude the secondary phase related to Mn metal cluster or any oxide phase of Mn. Magnetization studies reveal that both the films (3% and 5% Mn doped TiO2) exhibit room temperature ferromagnetism and saturation magnetization increases with increase in concentration of Mn doping. The spectral features of XMCD at Mn L3,2 edge show that Mn2+ ions contribute to the ferromagnetism. NEXAFS spectra measured at O K edge show a strong hybridization between Mn, Ti 3d and O 2p orbitals. NEXAFS spectra measured at Mn and Ti L3,2 edge show that Mn exist in +2 valence state, whereas, Ti is in +4 state in Mn doped TiO2 films. 相似文献
18.
The X-ray emission SiKα1, 2 and SiKβ1 spectra of a series of phenylcyclosilanes (SiPh2) n (n = 4–6) have been obtained. Using the results of quantum-chemical calculations in the density functional theory approximation, the fine structure of SiKβ1 spectra has been interpreted. Distributions of densities of electron states of silicon atoms over the valence band have been constructed and the types of chemical bonds providing the Si-Si and Si-Ph interactions have been established. Based on the theory of natural bond orbitals, the chemical bonding in the studied series of phenylcyclosilanes has been analyzed. 相似文献
19.
S. I. Kurganskii M. D. Manyakin O. I. Dubrovskii O. A. Chuvenkova S. Yu. Turishchev E. P. Domashevskaya 《Physics of the Solid State》2014,56(9):1748-1753
The electronic structure of tin dioxide has been theoretically studied within the linearized augmented plane wave method using the Wien2k program package. The total and local partial electron densities of states have been calculated. The X-ray emission K-spectrum of oxygen has been calculated. The X-ray absorption spectra of the tin M 4,5-edge and oxygen K-edge have been calculated by simulating the supercell and core hole. The calculated results have been compared with the experimental data obtained using synchrotron radiation. 相似文献
20.
X-ray absorption spectra: K-edges of 3d transition metals,L-edges of 3d and 4d metals,and M-edges of palladium 总被引:1,自引:0,他引:1
The X-ray absorption spectra of the 3d and 4d transition metals have been calculated within the single-particle approximation by a new linearized augmented plane wave method. The spectra, calculated with sharp atomic and band-structure single-particle levels, have been convoluted with a Lorentzian broadening function whose width is the sum of that of the core hole and the excited electrons. Plots are shown for (i) the K-edge fine structures up to at least 100 eV above the edge for Ca, Ti, Cr, Co, Cu, and Zn, (ii) the L2, 3 white lines for Ca, Ti, Cr, Co, and Cu, (iii) the L3 white lines for Sr, Zr, Nb, Ru, Rh, and Pd, and (iv) the M2, 3 and M4,5 spectrum of Pd. Systematic features which depend on the crystal structure and the placement of the Fermi level with conduction band are briefly discussed. 相似文献