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1.
B. Wende 《Zeitschrift für Physik A Hadrons and Nuclei》1968,213(4):341-351
Optical transition probabilities of the configurations 3p 5 4s–3p 5 5p of Argon I were determined in a wall-stabilized arc plasma and compared with the theoretical results for different types of spin-orbit-coupling. Mostly the differences in the results forLS-jl- and intermediate-coupling are small compared with the deviations of the experimental values. Therefore it may be presumed that in some cases not the assumption of an approximately valid coupling scheme is responsible for the errors of the theoretical transition probabilities, but the other quantum mechanical approximation processes. 相似文献
2.
Penthylene diammonium pentachlorothallate(III) exhibits a phase transition at 316 K <artwork name="GPHT21157eu1"> This transition has been characterized by optical birefringence, dielectric measurements differential scanning calorimetry and spectroscopic measurements on polycrystalline samples. The space group and the cell parameters of phase I were determined by X-ray diffraction from single crystals. Phase I has space group P212121, with Z = 4, a = 7.696(3), b = 13.2890(17) and c = 13.503(18) Å. The transition is both displacive and order-disorder involving mainly conformational changes of the organic chain [NH3(CH2)5NH3]2+ coupled with distortion of the TlCl6 octahedra. This behaviour and the crystal dynamics will be discussed and compared with those found in the literature for homologous compounds. 相似文献
3.
The collisional broadening and shift of four spectral lines of neon (747.2, 748.8, 753.5, 754.4 nm) arising from 2p5 3p - 2p5 3d transitions, emitted from a low-pressure glow discharge in pure neon and neon-helium mixtures have been measured using a Fabry-Perot interferometer. The values of pressure broadening and shift coefficients are determined and analyzed in terms of the impact theory. 相似文献
4.
N. F. Kahramanov S. R. Samedov S. S. Sadulova F. S. Samedov 《International Journal of Infrared and Millimeter Waves》2001,22(6):871-885
The anisotropy of photoconductivity in Au3In5Se9 and Au3Ga5Se9 crystals grown by the Bridgman method have been investigated as a function of temperature in the temperature range of 100 - 420 K. It is shown that the crystals have a wide range of spectral sensitivity of 0.9 - 1.8 eV. The width of the band gaps and their temperature coefficient are determined. The life time of the current carriers are determined at different levels of excitations. 相似文献
5.
The lifetime of the 5s5p 3 P 1 state of Sr has been determined with optical double resonance by observation ofrf-transitionsΔm J =±1 between Zeeman levels of the even isotopes. The measurement yields the value τ(53 P 1, Sr)=2.1(3) · 10?5 sec. A new type of narrowing of optical double resonance signals due to a time-of-flight effect of the radiating atom has been observed and compared with the theory. 相似文献
6.
《Journal of Physics and Chemistry of Solids》2003,64(4):599-605
The infrared (IR) reflectance spectra of Gd3Al5O12, Tb3Al5O12 and Lu3Al5O12 single crystals are studied for the first time. At room temperature, 15 infrared active modes for Lu3Al5O12 and 14 for Gd3Al5O12, Tb3Al5O12, out of the 17 theoretically predicted, have been experimentally recorded. The complex dielectric function the refractive index, the absorption coefficient as well as the longitudinal (ωLO) and transverse (ωTO) frequencies of the long-wavelength T1u modes are determined by the Kramers-Kronig transformation of the reflectance spectra. The experimental data are compared and discussed with the theoretical results obtained by the rigid ion model. Our theoretical analysis reveals that the bonds in the tetrahedra exhibit a covalent character while those in the dodecahedra almost ionic character, which is in accordance with the results for other materials of this crystal family. 相似文献
7.
I. V. Bodnar' T. L. Kushner V. Yu. Rud' Yu. V. Rud' M. V. Yakushev 《Journal of Applied Spectroscopy》2002,69(4):602-605
Using the method of oriented crystallization of a melt (a vertical variant), we grew homogeneous single crystals of the ternary compounds CuIn3Se5 and CuGa3Se5. Photosensitive structures based on them were created for the first time, the spectral dependences of the relative quantum efficiency of the phototransformation of structures were investigated, and the energy gap width of the ternary compounds was determined. It is established that the CuIn3Se5 and CuGa3Se5 compounds are materials with direct interband transitions. We show that the structures created can be used as wideband photoconverters of natural radiation. 相似文献
8.
Olzon-Dionysio M. de Souza S. D. Rodríguez Agustín M. Magon C. J. de Souza R. R. 《Hyperfine Interactions》2001,136(3-8):367-372
The static quadrupole interaction at the In site of the rare earth intermetallic compound Tb3In5 has been studied at room temperature by TDPAC technique. The results were compared with some Point Charge Model calculations,
using 2 or 3 for the In charge, suggesting the value 3. Some additional AC susceptibility measurements indicated that this
sample may be antiferromagnetic.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
9.
The electronic structures of URh (3), UPd (3), UPt (3), and UAu (3) are calculated with the self-interaction corrected local-spin-density approximation. We find that only in URh (3) the f electrons are fully delocalized. UPt (3) has one f electron localized at each U site, while a localized f(2) configuration of the U ion is found for UPd (3). It is predicted that, upon application of a pressure of 25 GPa, UPd (3) will acquire the f(1) configuration and possibly exhibit heavy-fermion behavior. We find that UAu (3) is characterized by the same mixed localized-delocalized f-electron manifold as UPd (3). 相似文献
10.
J. A. Hodges 《Hyperfine Interactions》1983,16(1-4):767-770
Measurements of the enhanced superhyperfine interaction linking the electron spin of an impurity EPR ion and the nuclear moments of Van Vleck host lattice ions are reported for Ru3+ in Tm3Al5O12 and for Ru3+ and Yb3+ in Tm3Ga5O12. The Ru3+ results appear to be the first reported where this interaction is large enough to give rise to a well resolved superhyperfine structure. For Yb3+ the observed temperature dependent line narrowing evidences the role of Tm spin fluctuations. 相似文献
11.
Xiao-Gang He 《Physics letters. [Part B]》1999,460(3-4)
Recently the KTev Collaboration has measured Re (ε′/ε)=(28±4.1)×10−4 which is in agreement with early measurements from NA31. The Standard Model prediction for ε′/ε is on the lower end of the experimentally allowed range depending on models for hadronic matrix elements. In this paper we study the contributions from anomalous gauge couplings. We find that the contributions from anomalous couplings can be significant and can enhance ε′/ε to have a value closer to data. 相似文献
12.
3-萘基-5-萘偶氮基-[1,3,4]-噻二唑-2-硫酮由二-α-萘基硫代卡巴腙与二硫化碳在碱性条件下发生加成闭环反应生成.文章研究了该反应的历程,提出该反应的机理是亲核加成,并通过IR谱、UV谱和NMR谱对标题化合物的结构进行了表征. 相似文献
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N. V. Znamenskii É. A. Manykin Yu. V. Orlov E. A. Petrenko T. G. Yukina Yu. V. Malyukin R. S. Borisov P. N. Zhmurin A. N. Lebedenko B. V. Grinev 《Journal of Experimental and Theoretical Physics》2001,93(2):372-379
A complex study of the energy spectra and relaxation channels for the excitation energy of activation centers in Y2SiO5:Pr3+, Lu2SiO5:Pr3+, and Gd2SiO5:Pr3+ was performed. An analysis of the low-temperature optical spectra showed that the energy parameters and the character of field splitting of the 1 D 2 and 3 H 4 activator ion terms were substantially different in crystals of different crystallographic types. The pseudosymmetry effect was observed in splitting of the 1 D 2 and 3 H 4 terms of Pr3+ ions situated in nonequivalent crystal lattice cation sites of Y2SiO5 and Lu2SiO5. Activator ions nonuniformly populated nonequivalent cation sites of the Y2SiO5 crystal lattice. At high activator ion concentrations (>1 at %), luminescence decay in Y2SiO5 could not be described by a simple exponential time dependence. The complex luminescence decay law was caused by activator ion excitation energy migration and capture by acceptors. The role of energy acceptors was played by activator ion dimers. 相似文献
17.
The circularly polarized luminescence spectra of Y3Al5O12-Tb and Y3Al5O12-Ho garnets are analyzed in the wavelength ranges of the 5 D 4 → 7 F 5 transition in the Tb3+ ion and the 5 S 2 → 5 I 8 transition in the Ho3+ ion. It is found that the intensities of the orthogonal circularly polarized components of the series of luminescence lines attributed to the studied garnets differ substantially. The results obtained are interpreted in terms of the mixing of the Tb3+ and Ho3+ electronic states in an external magnetic field. 相似文献
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19.
《Solid State Communications》1986,59(4):227-231
Neutron diffraction measurements performed on the Tb5Sb3 compound, which crystallizes in the hexagonal Mn5Sb3-type structure, indicate that the magnetic structure of the compound is a conical spiral between 150 and 80 K with a propagation vector k = [0,0,0.1414] and terbium magnetic moments 5.8 and 3.5 μB for the two sites, respectively. The axis of the cone makes an anlge of 51.5° with the c-axis of the crystal at 100 K. The anlge between the axis of the cone and the direction of the moments of both sites is found to be 28.5°. Below 80 K the diagram becomes very complicated with many peaks at low angles with more than one propagation vector. 相似文献
20.
I. V. Bodnar’ A. A. Vaipolin V. Yu. Rud’ Yu. V. Rud’ E. I. Terukov T. N. Ushakova 《Journal of Applied Spectroscopy》2006,73(6):874-878
We have created photosensitive heterostructures n-Ox/p-CuIn3Se5 for the first time. The synthesis process is based on thermal reaction of the ternary compound with atmospheric oxygen. We
have studied the voltage-current characteristics and the photoconversion quantum efficiency spectra of the indicated structures.
We discuss charge transport mechanisms and photosensitivity of the created structures. We show that n-Ox/p-CuIn3Se5 heterostructures can be used in designing solar cells and photoanalyzers for linearly polarized radiation.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 6, pp. 782–785, November–December, 2006. 相似文献