ID18 - Nuclear Resonance Beamline

Contact Tel: +33(0)47688 +ext Rudolf Rüffer, Scientist in charge 2100 Aleksandr I. Chumakov, Scientist 2352 ID18 Control Cabin 1 2780 ID18 Control Cabin 2 2781 ID18 Control Cabin 3 2782 Email: nrgcontact@esrf.fr

Synopsis

The ID18 beamline is designed and optimized for the excitation of nuclear levels of probe atoms in the sample under investigation. (The nuclear resonance facilities at ID22N were closed 1 March 2011.) 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

Scientific Applications

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.

Hyperfine spectroscopy

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).
• 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.

Techniques available

• 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.

Complementary Information

Other beamlines which might serve with complementary techniques on related topics are for studies on magnetism ID08, ID20, XMAS and on surfaces ID3, ID32. Phonons can be studied at the beamlines ID16 and ID28.