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  • 1
    Electronic Resource
    Electronic Resource
    Quadratic crystal field contributions to the ground S-state splitting of Gd3+ (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 97-103 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The linearity of contributions to the S-ground-state splitting (zero-field splitting, ZFS) of Gd3+ is confirmed by studies on the quadratic effects of the ZFS mechanisms, which are proved to be negligible in most cases. However, the quadratic crystal field (QCF), though small, may have marginal influence on the superposition model analyses of the experimental spin-Hamiltonian parameters. General expressions are thus obtained for QCF contributions to ZFS in ions with the open-shell f 7 configuration. These are used to calculate the quadratic contributions for Gd3+ in garnet host crystals. They show that these are small and yet should be allowed for when making superpositon model analyses of phenomenological parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458395
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  • 2
    Electronic Resource
    Electronic Resource
    Observation of localized above-barrier excitons in (CdTe)1(ZnTe)2/ZnTe short-period-superlattice multiple quantum wells by photoluminescence spectroscopy (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2090-2092 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The calculation of energy levels and wave functions of (CdTe)1(ZnTe)2/ZnTe short-period- superlattice multiple quantum wells is performed. It indicates that there may be above-barrier excitons localized in the ZnTe barrier layer. The photoluminescence arising from recombination of the above-barrier excitons has been observed. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112802
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  • 3
    Electronic Resource
    Electronic Resource
    Enhanced and stable photoluminescence from partially oxidized porous Si coated with Si thin films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 3781-3783 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoluminescence (PL) spectra of partially oxidized porous Si (POPS) coated with Si thin films were examined using the 488 nm line of Ar+ laser. The obtained PL is stable, peaks at 1.763 eV with a blueshift of ∼60 meV, and its maximal intensity is seven times larger than that of the POPS. Spectral analysis and the experimental results from infrared spectroscopy and electron spin resonance suggest that the enhanced and stable PL arises from optical transitions in the nonbridging oxygen hole centers (NBOHCs). Si coating mainly leads to introduction of the NBOHCs defects and thus makes the PL intensity enhanced. The blueshift of ∼60 meV is a result of the local equilibrium of NBOHCs defects under high temperature. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289787
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  • 4
    Electronic Resource
    Electronic Resource
    Ultraviolet and blue emission from crystalline SiO2 coated with LiNbO3 and LiTaO3 (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1812-1814 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crystalline SiO2 (α quartz) coated with LiNbO3 (LN) or LiTaO3 (LT) films emits two strengthened luminescence bands at 368 and 468 nm compared with those of pure α-SiO2, when excited with 280 nm light of a Xe lamp. These two bands strongly depend on the coating: the LN-coated α-SiO2 has a much stronger photoluminescence (PL) than the LT-coated α-SiO2. On the other hand, the two bands are different from those of α-SiO2 in that their excitation spectra do not have any noticeable band in the range 200–320 nm. They could be understood based on excitons in the α-SiO2 surface, which are induced by the photorefractive effect of the coated films. The 368 nm PL band is attributed to the optical transitions of the E′ defect pairs and the 468 nm PL band to the radiative recombination of the self-trapped excitons. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123094
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  • 5
    Electronic Resource
    Electronic Resource
    Raman scattering of alternating nanocrystalline silicon/amorphous silicon multilayers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 523-525 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanocrystallite size distribution and structural properties in alternating hydrogenated nanocrystalline silicon/amorphous silicon multilayers were investigated by means of Raman scattering. The obtained Raman spectra show a broad peak at ∼480 cm−1 from amorphous Si and some small peaks superposed on the broad peak. According to the positions of the crystallite peak, the mean crystallite size and volume fraction of the crystalline were calculated. Since these small peaks have strong size dependence of their relative intensities, an effect induced by the atomic vibrations from the near-surface region of nanocrystals is considered to be responsible for the modification of the vibrational properties and the stable photoluminescence from our samples. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117774
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  • 6
    Electronic Resource
    Electronic Resource
    Photoluminescence from optical waveguiding LiNbO3 film formed on crystalline SiO2 substrate by pulsed laser deposition (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3963-3965 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical waveguiding LiNbO3 film was grown on (001)-oriented crystalline SiO2 substrate by pulsed laser deposition. The film is highly (012) textured and has smooth surface. Its photoluminescence (PL) spectra were obtained by using the 514.4 nm line excitation of Ar+ laser, displaying a broad band peaked at 2.2 eV at room temperature and three well-resolved luminescent bands peaked at 2.3, 2.2, and 2.14 eV at liquid nitrogen temperature with different polarization properties. Spectral analysis indicates that these obtained PL bands arise from the self-trapped excitons and the E′ defect pairs connected with oxygen vacancies in the LiNbO3 film. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117981
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  • 7
    Electronic Resource
    Electronic Resource
    Observation of folded acoustic phonons in nanocrystalline silicon/amorphous silicon multilayers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1855-1857 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report in this letter the observation of folded acoustic phonons in hydrogenated nanocrystalline silicon/amorphous silicon multilayers with visible emission, which are prepared in a plasma enhanced chemical vapor deposition system. In the low-frequency range of 10–100 cm−1, the obtained Raman spectra clearly show some folded doublets from longitudinal acoustic phonons. Using the elastic continuum model, we calculated their frequencies and the obtained results were in agreement with the experimental ones. In addition, some broad folded doublets and additional peaks were clearly observed in the sample with thin nancorystalline sublayers. We attributed them to the mixing of longitudinal and transverse acoustic phonons due to the layered structure. A confined acoustic mode was also proposed to be responsible for the strongly folded longitudinal acoustic phonon peak at 61 cm−1. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117456
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal expansion and relaxation-crystallization kinetics of metallic glass Co63Ni6Fe4V2Si10B15 (1993)
    Springer
    Journal of materials science 28 (1993), S. 5814-5818 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The conventional dilatometric technique is applied to study the thermal expansion of the metallic glass Co63(FeNi)10V2Si10B15 with cylindrical samples rolled from ribbon. The heatingrate effect on expansion and differential thermal analysis (DTA) is investigated. The non-linear region of the temperature variation curves of relative elongation all show a broad peak and a distinct peak which correspond to those in DTA. The broad peak in DTA resolves into two peaks: the first one is associated with the glass transition which is interpreted as a quasi-first-order transformation. On comparing with X-ray diffraction analysis, the crystallization is determined to be a two-stage process in which Co(4F) precipitation is a controlling factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365186
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  • 9
    Electronic Resource
    Electronic Resource
    Phase-transition toughening of high-T c superconducting ceramics (1993)
    Springer
    Journal of materials science 28 (1993), S. 5875-5879 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of the superconducting transition (SCT) on the plane-strain fracture toughness K 1c of YBCO and BSCCO is studied by the method of three-point bend loading at room temperature and at 77 K. Toughening is observed and related to variation of the Gibbs free energy through the SCT, and hence to the condensation energy of a Cooper-pair gas. This is explained by the additional energy needed to excite superconducting electrons to normal ones in crack surfaces owing to magnetic field penetration. The superconducting gap parameters of YBCO and BSCCO are estimated and the results are reasonable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365195
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  • 10
    Electronic Resource
    Electronic Resource
    Raman and surface-enhanced Raman spectroscopic studies of sulphanilic acid azochromotrope (SPADNS) (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 24 (1993), S. 173-178 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The trisodium salt of 2-(4-sulphophenylazo)-1,8-dihydroxynaphthalene-3,6-disulphonic acid (SPADNS) was studied by Raman and surface-enhanced Raman spectroscopy (SERS) techniques. The Raman spectra of SPADNS powder and aqueous solution were investigated and an assignment of the Raman bands was made taking into account its infrared absorpiton spectrum. SPADNS tatomers, o-hydroxyazo and o-quinone hydrazone, are also discussed. Although the assignment is still preliminary owing to the complex structure of the SPADNS molecule, it provides useful information for SERS investigations of SPADNS in aqueous silver sol and on silve film. The results of SERS are compared with those of visible absorption spectra and x-ray photoelectron spectra (XPS) and the adsorption configuration of the SPADNS molecule on a silver surface is considered.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250240308
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