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  • 1
    Electronic Resource
    Electronic Resource
    Optical spectroscopy analysis of YBa2Cu3O7 at room temperature and at 10 K (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2382-2387 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical spectra of sputtered excited particles emitted during fast Kr+ ion bombardment of YBa2Cu3O7 above and below the critical temperature Tc∼90 K were recorded between 190.0 and 679.3 nm. Intensities and positions of lines are discussed and interpreted. The two optical spectra exhibit discrete lines which are attributed to neutral excited Cu, Ba, and Y and a few lines attributed to ionic Ba and Y. The relative intensities are the same at 10 K and at room temperature, while the absolute intensity increases by 40%. A small continuum attributed to oxide is also observed in the two spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348724
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  • 2
    Electronic Resource
    Electronic Resource
    An experimental and theoretical study of the doubly charged ion O2+2 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 3594-3602 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The energy levels of triplet states of doubly charge oxygen, obtained using double charge transfer spectroscopy, have been examined in the light of ab initio calculations. Four peaks were found in the double charge transfer spectrum with energies of 41.1±0.2, 43.2±0.2, 48.2±0.3, and 51.3±0.3 eV, respectively. The first and third peaks have been assigned to the 3Σ+u and the 3Πu excited states, respectively. The second peak has been assigned to the population of the 3Πg states. The configuration of the state at 51.3 eV is unknown. The effect of the symmetry rule Σ+↔(Slashthrough accent mark)Σ− is discussed and the validity of the spin conservation rule is demonstrated when a proton is used as a projectile in this experimental technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462865
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  • 3
    Electronic Resource
    Electronic Resource
    Vibronic and electronic states of doubly charged H2S studied by Auger and charge transfer spectroscopy and by ab initio calculations (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 918-931 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Doubly ionic states of H2S are investigated by means of Auger and double charge transfer spectroscopy. From the kinetic energy distribution of H− ions arising from double charge-transfer of protons impinging on gaseous H2S several singlet state energies of H2S2+ have been resolved in the 30 to 50 eV energy region. The most intense experimental peak is narrow proving that the doubly ionized ground state is stable or quasi-stable. The LII,IIIVV Auger electron spectrum exhibits a number of well-defined structures which exhibit vibrational fine structure in the outermost bands. The assignments of the charge transfer states and of the Auger bands are given by ab initio MCSCF electronic structure calculations. We also present vertical double ionization energies, optimized geometries and normal coordinate analysis for the neutral, single and double ionized states. A vibrational analysis of the resolved Auger bands is carried out by employing a recently derived theory for vibrational decay of short-lived core hole states in polyatomic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459118
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental and theoretical studies of the doubly charged NO2+2 ion (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3553-3564 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Six features observed in the energy distribution of H− ions arising from the single collision double charge transfer of 3–5 keV protons on nitrogen dioxide are interpreted as vertical double ionization energies of NO2 of 35.1, 38.1, 39.5, 41.0, 43.2, and 46.8 eV to form doublet states. Theoretical energies of the first 13 doublet and quartet electronic states of NO2+2 have been calculated by the ab initio CIPSI method at a fixed N–O distance and for several O–N–O bending angles. Thresholds and kinetic energy releases observed in dissociative double photoionization of NO2 are interpreted by comparison with the calculations and charge transfer results. The N- and O-Auger spectra of NO2 have been recorded and some of the 40 features observed have been assigned, confirming and improving the spectrum of NO2+2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454925
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of the Seebeck coefficient by an ac technique: Application to high-temperature superconductors (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2938-2941 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report on a sensitive and reliable ac technique to measure the Seebeck coefficient S of materials, in particular of high Tc superconductors. The small temperature difference between the ends of the sample allows structure in the S(T) curve to be observed. This technique avoids the creation of a component proportional to dS/dT in the measured signal. Such a component has in the past led to erroneous conclusions regarding the high-temperature superconductor YBCO. A mathematical analysis shows the origin of this component and how it can be avoided. These predictions are confirmed by experiments on a YBCO single crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144387
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  • 6
    Electronic Resource
    Electronic Resource
    Novel laser ion sources : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1405-1408 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Development in the field of high-power laser systems with repetition rates of several Hz and energies of few joules is highly active and opening, giving new possibilities for the design of laser ions sources. Preliminary investigations on the use of four different laser and target configurations are presented: (1) A small CO2 laser (100 mJ, 10.6 μm) focused onto a polyethylene target to produce C ions at 1 Hz repetition rate (CERN). (2) An excimer XeCl laser (6 J, 308 nm) focused onto solid targets (Frascati). (3) A femtosecond Ti: sapphire laser (250 mJ, 800 nm) directed onto a solid targets (Jena). (4) A picosecond Nd: yttrium–aluminum–garnet (0.3 J, 532 nm) focused into a dense medium of atomic clusters and onto solid targets (London). The preliminary experimental results and the most promising schemes will be discussed with respect to the scaling of the production of high numbers of highly charged ions. Different lasers are compared in terms of current density at 1 m distance for each charge state. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150470
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  • 7
    Electronic Resource
    Electronic Resource
    Status of the CO2 laser ion source at CERN : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 924-926 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A laser ion source using a CO2 laser focused onto a solid target is under study at CERN for the production of high currents of highly charged heavy ions, for possible use in the preinjector for the large hadron collider. A new expansion and extraction layout was installed in this test facility, improving the alignment and making the target to extraction distance more flexible. A two solenoid beam transport system was studied for providing the matching of the beam to a radio-frequency quadrupole. An electrostatic beam transport using gridded electrostatic lenses was designed and constructed as an alternative to a magnetic system. Results show an increased overall current transmission for the electrostatic case. Investigation of the laser parameters required for the production of 1.4×1010 Pb25+ ions in a 5 μs pulse, has been performed using the TIR-1 laser facility at power densities up to 1014 W cm−2 for a focal spot size of 65 μm. The results of the latest scaling are presented. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150347
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  • 8
    Electronic Resource
    Electronic Resource
    Measuring the critical current of high temperature superconductors in liquid nitrogen as a function of temperature (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 988-991 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A method of measuring the critical current of polycrystalline high temperature superconductors is described at various temperatures between 65 K and the transition temperature with the sample immersed in liquid nitrogen (LN2). The temperature of LN2 is varied following its phase diagram above the triple point (63.15 K). To increase the temperature of the nitrogen bath above 77 K, one increases the container gas pressure above 1 atm and pumps on the liquid to obtain temperatures below 77 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144877
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  • 9
    Electronic Resource
    Electronic Resource
    The complex magnetic behavior and the role of dynamic structural fluctuations in La1.2Sr1.8Mn2O7 crystals : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7351-7353 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The presence of dynamic structural distortions at the magnetic phase transitions in layered perovskite La1.2Sr1.8Mn2O7 crystals is found by ion channeling. Their amplitude is ∼1.5 picometer between 70 and 150 K, twice as that expected due to the thermal vibrations and static changes seen by neutron diffraction. Over the range 150 to 320 K a total change of ∼2.3 picometer is observed with discontinuities, which correlate well with the anomalous features seen in magnetic studies. In this material a small ferromagnetic component persists in the region 120 to 320 K, and it is fully paramagnetic above 320 K. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367797
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  • 10
    Electronic Resource
    Electronic Resource
    Formation of superconducting pellets and oriented films from Y2BaCuO5 (green phase) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3776-3779 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: One of the derivatives of the 1-2-3 high-Tc superconductors is known as the green phase (Y2BaCuO5). In a novel approach, the latter is proposed as the starting material to make oriented films deposited on MgO (001) by a simple painting method. Best results are obtained with a heat treatment up to 1040 °C and a slow cooling rate from 980 to 920 °C, giving films with Tc,50%=83 K and ΔTc=6 K. Scanning electron microscopy assisted by localized x-ray fluorescence permitted us to correlate the Tc's and Jc's with the general morphology of these films. Test pellets made with the 2:1:1 phase are also shown to be superconducting with a transition mid-point at Tc,50%=93 K and width of around 2 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345022
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