ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • American Institute of Physics (AIP)  (73)
  • Wiley-Blackwell  (71)
  • Blackwell Publishing Ltd  (42)
  • American Geophysical Union  (8)
  • 1995-1999  (115)
  • 1985-1989  (67)
  • 1975-1979  (12)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    A three-dimensional wave-packet method for the CH overtone spectroscopy and intramolecular vibrational relaxation dynamics of the fluoroform molecule (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 445-456 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The overtone spectroscopy and intramolecular vibrational relaxation dynamics of CH chromophore in the fluoroform molecule is studied by a three-dimensional (3D) time-dependent wave-packet method, and the results are compared with the experiment and with those of a 2D (stretch–bend) wave-packet method. A third mode (CF symmetrical stretch) is included in order to explain the long time dynamics and the combination bands between the CF stretch fundamental and the Fermi polyad frequencies. The comparison with the 2D study is carried out by the use of a full set of dynamical and spectroscopic variables, based on the autocorrelation function of the bright states of each polyad. The spectroscopic variables then follow by Fourier transforming the autocorrelation function, while the dynamical ones emerge via survival probability in the frame of the dynamical statistical ensemble. These include several relaxation times and the number of cells and rates of phase–space exploration. The specific effect of the third mode is monitored by following the reduced dynamics of the system irrespective of the polyad stretch–bend dynamics, through population evolution. Dynamical results clearly reveal the third mode effects at very short and long times. In the last regime, we can observe a great span of different behaviors, depending on how the third mode excited states are involved. This richer variety of dynamical patterns cannot be observed in a two-mode model and justifies the present work. The spectroscopic results of both models are in good agreement with the experimental results. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473386
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Divalent manganese in tetragonal sites of Cs2NaYCl6 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2776-2778 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron paramagnetic resonance (EPR) studies performed at room tempertaure in Mn2+ doped Cs2NaYCl6 single crystals (elpasolite) showed that the Mn2+ ion occupies a tetragonal symmetry site in the cubic crystalline lattice. In contrast with previous results on elpasolite, where trivalent rare earth impurities occupy Oh sites, and divalent europium impurities occupy trigonal sites, this work reports, the first evidence of an impurity in a tetragonal symmetry site in this host with principal axes along 〈100〉 crystallographic directions. The unusually large total splitting of the EPR spectrum (∼10 000×10−4 cm−1) is discussed in order to establish a tentative model for the site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456946
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The Hall mobility of excess electrons in 2,2-dimethylbutane, 2,2,4-trimethylpentane, and 2,2,4,4,-tetramethylpentane (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1128-1132 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Hall mobility (μH) of excess electrons was measured in liquid 2,2-dimethylbutane (22DMB), 2,2,4-trimethylpentane (224TMP), and 2,2,4,4-tetramethylpentane (2244TMP) at temperatures from 20 to 160 °C. Drift mobilities μD were also measured over this temperature range. At 20 °C the observed values of μH for 22DMB, 224TMP, and 2244TMP are 12, 22, and 32 cm2/V s, respectively. In all three liquids μH increases with temperature. The comparison of μH and μD indicates that electron traps are absent in 22DMB and 2244TMP. In contrast, in 224TMP μH is about 3.5 times μD at 18 °C. Thus, in this liquid, traps are present and the concentration of traps is about one per thousand solvent molecules. The Hall mobility results are in reasonable accord with the expectations of the deformation potential model and support the concept of scattering of electrons in the conduction band due to density fluctuations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456167
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Trapping characteristics of Te-related centers in GaAs1−xPx (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 5295-5301 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transient capacitance and photocapacitance techniques have been used to study the characteristics of two electron traps related to Te in GaAs1−xPx: Te. Levels En1 and En2 have thermal activation energies of 0.17 and 0.27 eV, respectively, and their thermal electron emission and capture rates deviate markedly from Schockley–Read–Hall theory for near band gap crossover compositions. Such centers are found for 0.3〈x≤1, are linked to the X conduction band minima, and their photoionization thresholds are 0.5 and 1 eV, respectively. Trap concentrations have been studied as a function of Te doping level, Zn diffusion temperature, and N content (x〉0.4) in GaAsP LEDs. It is suggested that both defects belong to the DX type, and they have been described by a large lattice relaxation model. Franck–Condon energies of 0.3 and 0.95 eV have been determined, respectively. The properties of present Te-related defects are quite similar to donor related centers in AlxGa1−xAs, including the nonexponential capacitance transients found in near x∼0.4 compositions. It is important to mention that both centers have very large hole capture coefficients (σp〉10−14 cm2) and behave as efficient recombination centers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335484
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Anisotropy induced by the bowed-substrate sputtering technique in positive/negative magnetostriction FeB/CoSiB bilayers (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4809-4811 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: CoSiB and FeB single layers and CoSiB/FeB bilayers with thicknesses ranging from 250 to 1500 Å were grown on bowed glass substrates using rf sputtering. A magnetoelastic anisotropy was induced in the magnetic layers after removing the films from the sputtering chamber. The positive (FeB) and the negative (CoSiB) magnetostrictive single layers showed an easy magnetization axis transverse and parallel to the compression axis, respectively. The magnetic behavior of the CoSiB/FeB bilayers is shown to be extremely sensitive to the thickness of each layer, to their thickness ratios, and also to the deposition sequence of the layers on the substrate. These results are discussed in terms of the interactions between two magnetic phases with easy magnetization axes transverse to each other. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370489
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    H–T diagrams of Ln1−xCaxMnO3 (x=1/2, 1/3) in pulsed fields up to 50 T (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5570-5572 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Well characterized Ln1−xCaxMnO3 manganites (Ln=La, Pr, Nd, Sm) with x=1/2 and x=1/3 have been investigated by magnetization measurements in pulsed magnetic fields up to 50 T. Using such high fields all the CO phase boundaries were identified in the temperature range 4–300 K. The transition fields at 4.2 K have been determined in a series of polycrystalline samples with x=1/2 and different effective bandwidths. They vary from Hc=8 T for La to (approximate)30 T for Sm. In this article we have focused on selected H–T phase diagrams. In particular, the results on Pr1/2Ca1/2MnO3, with the ideal 1:1 electron/hole ratio, are compared with Pr2/3Ca1/3MnO3 where the carrier concentration has been significantly reduced. The observed anomalies in the Hc(T) curves are discussed in the light on neutron diffraction data. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369897
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Charge localization and magnetic dynamics in ferromagnetic and charge-ordered manganites (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5639-5641 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The local spin dynamics in the paramagnetic phase of ferromagnetic and charge-ordered Mn perovskites has been investigated by muon spin relaxation. Significant differences are observed in the muon relaxation in ferromagnetic (F) and antiferromagnetic (AF) Ln1−xCaxMnO3 samples with x=1/3 and 1/2. A glassy like spin dynamics is found close to TC in the former which is completely suppressed in samples with dominant AF exchange interactions. The observation of a falloff in the muon relaxation rate at TCO in Ln1/2Ca1/2MnO3 is also discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369825
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Trigonal sites of Eu2+ in single crystals of Cs2NaYCl6 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 7189-7192 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron paramagnetic resonance measurements are reported for Eu2+ ions occupying trigonal sites in Cs2NaYCl6 single crystals. Spin–Hamiltonian parameters are reported at room temperature. A tentative model for the location of the impurity in the lattice is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455297
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Parametric decays of a circularly polarized electromagnetic wave in an electron–positron plasma (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 3171-3179 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Parametric decays of a circularly polarized electromagnetic wave in an electron–positron unmagnetized plasma are studied. Like in the case of a plane polarized wave, there are two distinctive situations. One in which vs/c〈c/vp (vs is the electroacoustic speed, c the speed of light, and vp is the phase velocity of the electromagnetic wave), and the other situation when vs/c≥c/vp. In the first case, there is an ordinary decay instability and two modulational instabilities. One of the modulational instabilities is a resonant instability, and the other is a nonresonant, essentially electromagnetic instability in which the pump wave decays into two sideband waves. In the second situation (vs/c≥c/vp), there are two modulational instabilities similar to the previous situation, but as the intensity of the pump wave increases, the resonant modulational instability disappears and only the nonresonant electromagnetic instability remains. The effect of Landau damping on the electroacoustic modes is also studied. This effect is simulated through a collisional term in the fluid equations. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873045
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘Parametric decays of a circularly polarized electromagnetic wave in an electron–positron plasma' " [Phys. Plasmas 6, 633 (1999)] (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 635-635 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this response we shall rebut what we consider to be misleading statements in the comment by Shukla and Stenflo (hereafter referred to as SS). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873219
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...