The ID18 beamline is designed and optimized for the excitation of nuclear levels of probe atoms in the sample under investigation. Key parameters are:
- optimized flux at the Mössbauer energies in the range from 6 keV to 30 (60) keV
- high energy resolution down to meV level by 'electronic' monochromators
- ultra-high energy resolution down to neV level by 'nuclear' monochromators
- time resolution down to sub-ns level
- use of the pulsed time structure of the synchrotron source
Nuclear resonance scattering is a technique which is applied to various fields. Especially applications to samples under extreme conditions like high pressure, low/high temperature, high external magnetic field, confined geometries or tiny samples benefit most from the outstanding properties of synchrotron radiation. Besides basic and fundamental research, NRS applications may be roughly divided into hyperfine spectroscopy and (structural) dynamics.
comprises the investigation of static and dynamic magnetic and electric properties such as electron densities, fields and field gradients of magnetic or electric origin.
- In transmission geometry poly- and single crystalline samples and amorphous specimens can be investigated by nuclear forward scattering (NFS, SMS).
- Surfaces, interfaces and multilayers will be investigated using nuclear reflectometry (NR).
- Single crystals allow one to determine in addition the electric and magnetic structure by nuclear Bragg diffraction (NBD).
- Magnetic and electric domains, domains with roughness are accessible by nuclear small angle scattering (NSAS).
Structural dynamics of "resonant" samples
comprises the investigation of element specific
- density of phonon states (DOS) by nuclear inelastic scattering (NIS)
- diffusion by nuclear quasi-elastic scattering (NQES)
- rotational dynamics by synchrotron radiation based perturbed angular correlation spectroscopy (SRPAC)
Structural dynamics of "non-resonant" samples are accessible
- for DOS via inelastic scattering with nuclear resonance energy analysis
- for diffusion etc. via time interferometry.
Basic and fundamental research
as longitudinal coherence, interferometry, nuclear and electronic interference, features of nuclear diffraction.
- nuclear forward scattering (NFS)
- nuclear Bragg diffraction (NBD)
- nuclear small angle scattering (NSAS)
- nuclear reflectometry (NR)
- nuclear quasi-elastic scattering (NQES)
- nuclear inelastic scattering (NIS)
- synchrotron radiation perturbed angular correlation (SRPAC)
- quasi-elastic and inelastic scattering with nuclear resonance energy analysis
- synchrotron Mössbauer source (SMS).
Other beamlines which might serve with complementary techniques on related topics are for studies on magnetism ID08, XMAS and on surfaces ID3, SPLINE. Phonons can be studied at the beamline ID28.