Library

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
  • 1
    Electronic Resource
    Electronic Resource
    Interlayer transition zones in Mo/Si superlattices (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1216-1220 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation of interlayer transition zones (ITZs) in sputtered Mo/Si multilayer structures was studied by means of cross-section electron microscopy and grazing incidence reflectivity measurements. For the evaluation and calculation of interface effects the multiperiodic design of Mo/Si structure was used. It was found that the thickness asymmetry of ITZs (Mo-on-Si and Si-on-Mo) in Mo/Si multilayer structures depends on the degree of perfection of the crystalline structure of the molybdenum layer. A transition from asymmetrical to symmetrical ITZs with a disordering of the molybdenum crystalline structure was shown. A model for the formation mechanism of asymmetrical ITZs at the different interfaces in Mo/Si multilayer structures is suggested. According to this model, ITZ formation at the Mo-on-Si interface is controlled by the surface diffusion of Si atoms on the growing molybdenum surface. In contrast, ITZ formation at the Si-on-Mo interface is determined by the bulk diffusion of Si atoms in textured molybdenum grains. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1487919
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Single-particle potential in a chiral approach to nuclear matter including short-range NN-terms (2003)
    Springer
    The European physical journal 17 (2003), S. 11-18 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 12.38.Bx Perturbative calculations – 21.65.+f Nuclear matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We extend a recent chiral approach to nuclear matter of Lutz et al.Phys. Lett. B 474, 7 (2000)) by calculating the underlying (complex-valued) single-particle potential U(p, k f) + iW(p, k f). The potential for a nucleon at the bottom of the Fermi sea, U(0, k f0) = - 20.0 MeV, comes out as much too weakly attractive in this approach. Even more seriously, the total single-particle energy does not rise monotonically with the nucleon momentum p, implying a negative effective nucleon mass at the Fermi surface. Also, the imaginary single-particle potential, W(0, k f0) = 51.1 MeV, is too large. More realistic single-particle properties together with a good nuclear-matter equation of state can be obtained if the short-range contributions of non-pionic origin are treated in mean-field approximation (i.e. if they are not further iterated with 1π-exchange). We also consider the equation of state of pure neutron matter ¯En(k n) and the asymmetry energy A(k f) in that approach. The downward bending of these quantities above nuclear-matter saturation density seems to be a generic feature of perturbative chiral pion-nucleon dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2002-10149-x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Manufacturing technologies for miniaturized interference filters (2000)
    Springer
    Microsystem technologies 6 (2000), S. 77-81 
    Details
    ISSN: 1432-1858
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Technology
    Notes: Abstract  Miniaturized interference filters were designed and fabricated using two different manufacturing technologies. Applying micromachined ceramic masks during the coating processes interference filters with 1 mm lateral feature size and an alignment accuracy of 50 μm were arranged in an array consisting of three different filters. The filter edge definition obtained by this method was smaller than 50 μm. By applying ion assisted deposition (IAD), a low-temperature coating process, the spectral sensitivity of receiver cells has been modified by coating the cells directly. A combination of coating processes, microlithographic masking procedures, and dry etching technologies made it possible to arrange three different stripe filters with minimum filter features of about 5 μm side by side. The accuracy during mask alignment and the filter edge definition was also within 1 and 2 μm, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005420050001
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Chiral approach to nuclear matter: Role of explicit short-range NN-terms (2004)
    Springer
    The European physical journal 21 (2004), S. 117-131 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We extend a recent chiral approach to nuclear matter by including the most general (momentum-independent) NN-contact interaction. Iterating this two-parameter contact vertex with itself and with one-pion exchange the emerging energy per particle exhausts all terms possible up to and including fourth order in the small momentum expansion. Two (isospin-dependent) cut-offs $\Lambda_{0,1}$ are introduced to regularize the (linear) divergences of some three-loop in-medium diagrams. The equation of state of pure neutron matter, $\bar E_n(k_n)$ , can be reproduced very well up to quite high neutron densities of $\rho_n = 0.5 \mathrm{fm}^{-3}$ by adjusting the strength of a repulsive nn-contact interaction. Binding and saturation of isospin-symmetric nuclear matter is a generic feature of our perturbative calculation. Fixing the maximum binding energy per particle to $-\bar E(k_{f0}) = 15.3 $ MeV we find that any possible equilibrium density $\rho_0$ lies below $\rho_0^{\rm max} = 0.191 \mathrm{fm}^{-3}$ . The additional constraint from the neutron matter equation of state leads however to a somewhat too low saturation density of $\rho_0 = 0.134 \mathrm{fm}^{-3}$ . We also investigate the effects of the NN-contact interaction on the complex single-particle potential U(p,k f ) + i W(p,k f ). We find that the effective nucleon mass at the Fermi surface is bounded from below by $M^*(k_{f0}) \geq 1.4 M$ . This property keeps the critical temperature of the liquid-gas phase transition at somewhat too high values $T_{\rm c} \geq 21 $ MeV. The downward bending of the asymmetry energy A(k f ) above nuclear-matter saturation density is a generic feature of theapproximation to fourth order. We furthermore investigate the effects of the NN-contact interaction on the $(\mathop{\nabla}\limits^{\to} \rho)^2$ -term in the nuclear energy density functional ${\cal E}[\rho,\tau]$ . Altogether, there is within this complete fourth-order calculation no “magic” set of adjustable short-range parameters with which one could reproduce simultaneously and accurately all semi-empirical properties of nuclear matter. In particular, the conditions for a good neutron matter equation of state and for good single-particle properties are mutually exclusive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2003-10179-x
    Library Location Call Number Volume/Issue/Year 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...