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The Time-of-flight and High-Resolution Group

The Time-of-flight and High-Resolution (TOF-HR) group of the ILL operates three distinct kinds of instruments that measure the atomic, molecular and crystal motions of samples in powder, glass or liquid form.

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P. Fouquet

Benzene molecules moving on a graphite surface

Peter Fouquet


Research Interests

- Dynamics and structure of molecules adsorbed on surfaces and in nano-cages.
- Surface diffusion and friction - mainly on carbon systems.
- Development of potential energy landscapes of surface adsorbed molecules using experimental and theoretical methods.
- Understanding of surface effects on the dynamics of confined liquids.
- Development of models for the description of the dynamics close to the glass transition.
- Dynamics of magnetic systems.

Technical Developments

- Development of new instrumentation for neutron scattering (spin-echo  and time-of-flight spectrometers).
- Experimental techniques: Neutron and helium atom scattering, adsorption isotherms, standard surface science techniques.


Computational/theoretical methods

Classical molecular dynamics simulations, density functional theory calculations. Extensive use of analytical and finite element magnetic field calculations as well as of Monte-Carlo ray-tracing simulations.



List of Publications

Papers in Refereed Journals

47    Arndt, O. Stockert, E. Faulhaber, P. Fouquet, H.S. Jeevan, C. Geibel, M. Loewenhaupt and F. Steglich
Characteristics of the magnetic order in CeCu2Si2 revealed by neutron spin-echo measurements
J. Phys.: Conf. Series. 200, 012009 (2010).

46    Lal, P. Fouquet, M. Maccarini and L. Makowski
Neutron Spin-Echo Studies of Hemoglobin and Myoglobin: Multiscale Internal Dynamics
Mol. Biol. 397, 423 (2010).

45    M. Karlsson, P. Fouquet, I. Ahmed and M. Maccarini
Dopant Concentration and Short-Range Structure Dependence of Diffusional Proton Dynamics in Hydrated BaInxZr1-xO3-x/2 (x = 0.10 and 0.50)
J. Phys. Chem. C 114, 3292 (2010).

44    F. Roosen-Runge, M. Hennig, T. Seydel, F. Zhang, M.W.A. Skoda, S. Zorn, R.M.J. Jacobs, M. Maccarini, P. Fouquet, F. Schreiber
Protein diffusion in crowded electrolyte solutions
Biochim. Biophys. Acta 1804, 68 (2010).

43     (Invited Review Article) P. Fouquet, H. Hedgeland and A.P. Jardine
Surface diffusion studies using neutron and helium spin-echo spectroscopy
Z. Phys. Chem. 224, 61 (2010).

42    H. Hedgeland, P. Fouquet, A.P. Jardine, G. Alexandrowicz, W. Allison and J. Ellis
Measurement of single molecule frictional dissipation in a prototypical nanoscale system
Nature Physics 5, 561 (2009).

41    P. Fouquet, B. Farago, K.H. Andersen, P.M. Bentley, G. Pastrello, I. Sutton, E. Thaveron, F. Thomas, E. Moskvin and C. Pappas
Design and Experimental Tests of a Novel Neutron Spin Analyzer for Wide Angle Spin Echo Spectrometers
Rev. Sci. Instrum. 80, 095105 (2009).

40    P. Fouquet, M.R. Johnson, H. Hedgeland, A.P. Jardine, J. Ellis and W. Allison
Molecular dynamics simulations of the diffusion of benzene sub-monolayer films on graphite basal plane surfaces
Carbon 47, 2671 (2009).

39    H. N. Bordallo, L. P. Aldridge, P. Fouquet, L. C. Pardo, T. Unruh, J. Wuttke and F. Yokaichiya
Hindered Water Motions in Hardened Cement Pastes Investigated over Broad Time and Length Scales
ACS Appl. Materials Interfaces 1, 2154 (2009).

38    C. Pappas, E. Lelievre-Berna, P. Falus, P. M. Bentley, E. Moskvin, S. Grigoriev, P. Fouquet and B. Farago
Chiral Paramagnetic Skyrmion-like Phase in MnSi
Phys. Rev. Lett. 102, 197202 (2009).

37    R. M. Pickup, R. Cywinski, C. Pappas, B. Farago and P. Fouquet
Generalized Spin-Glass Relaxation
Phys. Rev. Lett. 102, 097202 (2009).

36    A. Arbe, A.-C. Genix, J. Colmenero, D. Richter and P. Fouquet
Anomalous relaxation of self-assembled alkyl nanodomains in high-order poly(n-alkyl methacrylates)
Soft Matter 4, 1792 (2008).

35    H. N. Bordallo, L. P. Aldridge, G. J. Churchman, W. P. Gates, M. T. F. Telling, K. Kiefer, P. Fouquet, T. Seydel and S. A. J. Kimber
Quasi-elastic neutron scattering studies on clay interlayer-space highlighting the effect of the cation in confined water dynamics
J. Phys. Chem. C 112, 13982 (2008).

34    K. Yoshida, T. Yamaguchi, S. Kittaka, M.-C. Bellissent-Funel and P. Fouquet
Thermodynamic, structural, and dynamic properties of supercooled water confined in mesoporous MCM-41 studied with calorimetric, neutron diffraction, and neutron spin echo measurements
J. Chem. Phys. 129, 054702 (2008).

33    V. Simonet, R. Ballou, J. Robert, B. Canals, F. Hippert, P. Bordet, P. Lejay, P. Fouquet, J. Ollivier and D. Braithwaite
Hidden magnetic frustration by quantum relaxation in anisotropic Nd langasite
Phys. Rev. Lett. 100, 237204 (2008).

32    F. J. Bermejo, C. Cabrillo, E. Bychkov, P. Fouquet, G. Ehlers, W. Haussler, D. L. Price and M. L. Saboungi
Tracking the effects of rigidity percolation down to the liquid state: Relaxational dynamics of binary chalcogen melts
Phys. Rev. Lett. 100, 245902 (2008).

31    K. Wood, C. Caronna, P. Fouquet, W. Haussler, F. Natali, J. Ollivier, A. Orecchini, M. Plazanet and G. Zaccai
A benchmark for protein dynamics: Ribonuclease A measured by neutron scattering in a large wavevector-energy transfer range
Chem. Phys. 345, 305 (2008).

30    G. Ehlers, J. S. Gardner, Y. Qiu, P. Fouquet, C. R. Wiebe, L. Balicas and H. D. Zhou
Dynamic spin correlations in stuffed spin ice Ho2+xTi2-xO7-δ
Phys. Rev. B 77, 052404 (2008).

29    O. E. Haas, J. M. Simon, S. Kjelstrup, A. L. Ramstad and P. Fouquet
Quasi-elastic neutron scattering investigation of the hydrogen surface self-diffusion on polymer electrolyte membrane fuel cell catalyst support
J. Phys. Chem. C 112, 3121 (2008).

28    J. Gutierrez, J. M. Barandiaran, F. J. Bermejo, C. Mondelli, P. Romano, P. Fouquet and M. Monkenbusch
Evidence for two disparate spin dynamic regimes within Fe-substituted La0.7Pb0.3(Mn1-xFex)O3 (0 <= x <= 0.2) colossal magnetoresistive manganites: Neutron spin-echo measurements
Phys. Rev. B 76, 184401 (2007).

27    Y. Chapuis, A. Yaouanc, P. Dalmas de Reotier, S. Pouget, P. Fouquet, A. Cervellino and A. Forget
Ground state of the geometrically frustrated compound Tb2Sn2O7
J. Phys. Cond. Matter 19, 446206 (2007).

26    H. D. Zhou, C. R. Wiebe, Y. J. Jo, L. Balicas, Y. Qiu, J. R. D. Copley, G. Ehlers, P. Fouquet and J. S. Gardner
The origin of persistent spin dynamics and residual entropy in the stuffed spin ice Ho2.3Ti1.7O7-δ
J. Phys. Cond. Matter 19, 342201 (2007).

25    H. Mutka, C. Payen, D. Bono, G. Ehlers, P. Fouquet, M.R. Johnson, P. Mendels,
J.Y. Mevellec, J.R. Stewart
Phonon-assisted relaxation in a frustrated antiferromagnet
J. Magn. Magn. Materials 310, 1325 (2007).

24    P. Fouquet, G. Ehlers, B. Farago, C. Pappas and F. Mezei
The Wide-Angle Neutron Spin Echo Spectrometer Project WASP
J. Neutron Res. 15, 39 (2007).

23    E. Blackburn, A. Hiess, N. Bernhoeft,1, M. C. Rheinstädter, P. Fouquet and G. H. Lander
Neutron spin-echo on magnetic single crystals in the quantum limit
Physica B 397, 95 (2007).

22    M. Alba, S. Pouget, P. Fouquet, B. Farago and C. Pappas
Dynamical scaling and critical scattering in pure and disordered ferromagnetsprobed by NSE
Physica B 397, 102 (2007).

21    D.J. Riley, A.P. Jardine, S. Dworski, G. Alexandrowicz, P. Fouquet, J. Ellis and W. Allison
A refined He-LiF(001) potential for selective adsorption resonances measured with high-resolution helium spin-echo spectroscopy
J. Chem. Phys. 126, 104702 (2007).

20    P. Fouquet, H. Hedgeland A.P. Jardine, G. Alexandrowicz, W. Allison and J. Ellis
Measurements of molecule diffusion on surfaces using neutron and helium spin echo
Physica B 385-386, 269 (2006).

19    R. Hölzel, P.M. Bentley and P. Fouquet
Instrument Design and Optimisation Using Genetic Algorithms
Rev. Sci. Instrum. 77, 105107 (2006).

18    H. Mutka, G. Ehlers, C. Payen, D. Bono, J. R. Stewart, P. Fouquet, P. Mendels, J. Y. Mevellec, N. Blanchard and G. Collin
Neutron Spin-Echo Neutron spin-echo investigation of slow spin dynamics in kagome-bilayer frustrated magnets as evidence for phonon assisted relaxation in SrCr9xGa12-9xO19
Phys. Rev. Lett. 90, 047203 (2006).

17    F. Demmel, P. Fouquet, W. Häußler and C. Morkel
DeGennes slowing in a liquid metal revisited: A neutron spin echo study
Phys. Rev. E 73, 032202 (2006).

16    H. Jobic, H. Ramanan, S.M. Auerbach, M. Tsapatsis and P. Fouquet
Probing Cooperative Jump-Diffusion in Zeolites: Neutron Spin-Echo Measurements and Molecular Dynamics Simulations of Benzene in NaX
Microporous Mesoporous Mat. 90, 307 (2006).

15    P. Fouquet, A.P. Jardine, S. Dworski, G. Alexandrowicz, W. Allison and J. Ellis
A thermal 3He spin-echo spectrometer for ultra-high resolution surface dynamics measurements
Rev. Sci. Instrum. 76, 053109 (2005).   

14    G. Alexandrowicz, A.P. Jardine, P. Fouquet, S. Dworski, W. Allison and J. Ellis
Observation of microscopic CO dynamics on Cu(001) using 3He spin-echo spectroscopy
Phys. Rev. Lett. 93, 156103 (2004).

13    A.P. Jardine, S. Dworski, P. Fouquet, G. Alexandrowicz, D.J. Riley, G.Y.H. Lee, J. Ellis and W. Allison
Ultrahigh-resolution spin-echo measurement of surface potential energy landscapes 
Science 304, 1790 (2004)

12    S. Dworski, G. Alexandrowicz, P. Fouquet, A.P. Jardine, W. Allison and J. Ellis
Low aberration permanent hexapole magnet for atom and molecular beam research 
Rev. Sci. Instrum. 75, 1963 (2004).

11    P. Fouquet, R.A. Olsen and E.J. Baerends
Diffusion and vibration of CO molecules adsorbed on a Cu(100) surface: A periodic density functional theory study        
J. Chem. Phys. 119, 509 (2003).

10    R. Brühl, P. Fouquet, R.E. Grisenti, J.P. Toennies, G.C. Hegerfeldt, T. Köhler, M. Stoll and C. Walter
The van der Waals potential between metastable atoms and solid surfaces: Novel diffraction experiments vs. theory
Europhysics Lett. 59, 357 (2002).

9    A.P. Jardine, P. Fouquet, J. Ellis, and W. Allison
Hexapole magnet system for thermal energy 3He atom manipulation        
Rev. Sci. Instrum. 72, 3834 (2001).

8    P. Fouquet and G. Witte
Metallization and demetallization of clean and oxygen-covered ultrathin alkali metal films on GaAs(100)        App. Surf. Sci. 180, 286 (2001).

7    S. Bartholmei, P. Fouquet and G. Witte
Growth and dynamics of ultrathin barium films on Cu(100)        
Surf. Sci. 473, 227 (2001).

6    S. Vollmer, P. Fouquet, G. Witte, Ch. Boas, M. Kunat, U. Burghaus, Ch. Wöll
Low-energy vibrational dynamics of ultrathin organic adlayers: alkanethiols adsorbed on copper        
Surf. Sci. 462, 135 (2000).

5    P. Fouquet, A.P. Graham and G. Witte  
A He atom scattering study of the adsorption of NO on Pt(111)
J. Chem. Phys. 112, 7600 (2000).

4    P. Fouquet and G. Witte
Monitoring of electronic poisoning of ultrathin alkali metal films by oxygen and carbon monoxide adsorption       
Surf. Sci. 454-456, 256 (2000).

3    P. Fouquet and G. Witte
Observation of metallization transition of 2D alkali metal films        
Phys. Rev. Lett. 83, 360 (1999).

2    P. Fouquet and G. Witte
Metastable (23S) helium atom scattering from molecular adsorbates on Pd and Cu surfaces       
Surf. Rev. Lett. 6, 103 (1999).

1    P. Fouquet, P.K. Day and G. Witte
Metastable (23S) helium atom scattering from NiO(100) and Cu(100) surfaces
Surf. Sci. 400, 140 (1998).

Annual Reports etc.

9    A. Arbe, J. Colmenero, A. C. Genix, D. Richter and P. Fouquet
Nano-confinement through self-assembly: emergence of anomalous relaxation
ILL Annual Report 2008, Scientific Highlight

8    V. Simonet, R. Ballou, J. Robert, B. Canals, P. Bordet, P. Lejay, F. Hippert, P. Fouquet and J. Ollivier
Hidden magnetic frustration by quantum relaxation in anisotropic Nd-langasite
ILL Annual Report 2008, Scientific Highlight

7    P. Fouquet, A.P. Jardine, H. Hedgeland, G. Alexandrowicz, W. Allison and J. Ellis
The interaction potential between benzene and graphite surfaces resolved using spin-echo spectroscopies and MD calculations
ILL Annual Report 2006, Scientific Highlight

6    P. Bentley, P. Fouquet, R. Hölzel, M. Crawford
Self Evolving Instruments: Genetic Algorithms Produce an Optimum Design for the Wide Angle Spin-Echo Spectrometer WASP
ILL Annual Report 2006, Technical Section

5    E. Blackburn, A. Hiess, N. Bernhoeft, M. C. Rheinstädter, W. Häußler, P. Fouquet, G. H. Lander
Probing magnetisation dynamics in quantum systems: how to improve energy resolution using neutron spin-echo spectroscopy
ILL Annual Report 2006, Scientific Highlight

4    C. Payen, P. Mendels, D. Bono, G. Ehlers, H, Mutka, P. Fouquet, J. R. Stewart
Lattice vibrations drive relaxation in a highly frustrated magnet
ILL Annual Report 2006, Scientific Highlight

3    P. Fouquet
The Workshop NSE 2005
ILL Bulletin 2005

2    P. Fouquet
The Workshop NSE 2005
ILL News for Users, December 2005

1    P. Fouquet, B. Farago, M. Rheinstaedter
The Workshop NSE 2005
ILL Annual Report 2005