Eur. Phys. J. B 22, 301-306 (2001)
https://doi.org/10.1007/s100510170107

Quasielastic nuclear forward scattering as a background-free probe of slow glass dynamics in confined geometries

¹ Institut für Experimentalphysik E13, TU München, James-Franck-Str. 1, 85747 Garching, Germany
² European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
³ Hasylab/DESY, Notkestr. 85, 22603 Hamburg, Germany
⁴ Fakultät für Chemie, TU München, 85747 Garching, Germany
⁵ Fakultät für Physik und Geowissenschaften, Linnéstr. 5, 01043 Leipzig, Germany

Corresponding author: ^a t.asthalter@ipc.uni-stuttgart.de

Received: 18 December 2000
Revised: 16 May 2001
Published online: 15 August 2001

Abstract

The microscopic dynamics of dibutylphthalate/ferrocene in nanoporous silica matrices with pore sizes of 25, 50, 75, and 200 Å, respectively, has been investigated in a temperature range between 70 and 200 K by nuclear resonant scattering of synchrotron radiation. The decay of the coherently forward scattered signal is enhanced owing to the diffusive motion of resonant nuclei on the timescale of the nuclear resonance lifetime. This enhancement contains information about the self-correlation function for a fixed wave vector k = 7.3 Å^-1. In the viscous regime and for 25 Å pores the diffusional dynamics is clearly slowed down when compared to the bulk material.