Dr. Stefan Janssen

Stefan

Head - User Office and Guest House

Paul Scherrer Institute
Forschungsstrasse 111
5232 Villigen PSI
Switzerland
Telephone
+41 56 310 28 75
Since 2010 Head - PSI Guest House
Since 2004 Head - PSI User Office
Since 2004 Staff member and group leader NUM division, PSI
1999-2004 Scientific staff member Laboratory for Neutron Scattering, PSI & ETHZ, spectroscopy group, responsible scientist for the time-of-flight spectrometer FOCUS at SINQ/PSI
1994-1999 Scientific staff member University of Saarbrücken (DE), Physical Chemistry, in charge for building and operating the time-of-flight spectrometer FOCUS at SINQ/PSI
1991-1994

Ph.D. thesis, Institut für Festkörperforschung IFF, Forschungszentrum Jülich and RWTH Aachen, DE
1985-1991 studies of physics at RWTH Aachen, DE
since 2016 European User Office Meetings
since 2009 Joint User Meetings at PSI
since 2004 SLS User Meetings
since 2001 SINQ User Meetings
2004-2016 Organizing committee of the PSI summer school on condensed matter research
1999 Young Scientst Panel, Group "Soft Condensed Matter", European Conference on Neutron Scattering, Budapest
2018-2020 Member OECD Global Science Forum Working Group "Optimising the operation and use of national research infrastructures"
Since 2018 Member PSI "Personalkommission"
Since 2017 Board member and PSI representative "Verein Studentisches Wohnen - Region Brugg/Windisch"
2015-2017 Evaluation and review group: proposal selection and time allocation processes at European Southern Observatory ESO
2001-2009 Scientific secretary and board member of the Swiss Neutron Scattering Society
Since 2001 Scientific secretary of the SINQ Scientific Advisory Committee
Since 2001 Swiss Physical Society SPG/SPS, CH
Since 1995 Swiss Neutron Scattering Society SGN/SNSS, CH
1991-2010 German Physical Society, DPG, DE
  • Janssen S, Schwahn D, Springer T
    Mean-field Ising crossover and the critical exponents, and for a polymer blend: D-PB/PS studied by small-angle neutron scattering
    Physical Review Letters. 1992; 68(21): 3180-3183. https://doi.org/10.1103/PhysRevLett.68.3180
    DORA PSI
  • Meier G, Schwahn D, Mortensen K, Janssen S
    On the crossover from ising to mean-field behaviour in compatible binary-polymer blends
    Europhysics Letters. 1993; 22(8): 577-588. https://doi.org/10.1209/0295-5075/22/8/004
    DORA PSI
  • Mortensen K, Schwahn D, Janssen S
    Pressure-induced melting of micellar crystal
    Physical Review Letters. 1993; 71(11): 1728-1731. https://doi.org/10.1103/PhysRevLett.71.1728
    DORA PSI
  • Schwahn D, Mortensen K, Janssen S
    Critical neutron scattering in a polymer blend above and below the critical point of demixing: Critical exponents and amplitude ratios
    Physical Review Letters. 1994; 73(10): 1452-1455. https://doi.org/10.1103/PhysRevLett.73.1452
    DORA PSI
  • Janssen S, Schwahn D, Springer T, Mortensen K
    Coil and Melt Compressibility of Polymer Blends Studied by SANS and pVT Experiments
    Macromolecules. 1995; 28(7): 2555-2560. https://doi.org/10.1021/ma00111a059
    DORA PSI
  • Mesot J, Janssen S, Holitzner L, Hempelmann R
    Focus: project of a space and time focussing time-of-flight spectrometer for cold neutrons at the spallation source SINQ of the Paul Scherrer Institute
    Journal of Neutron Research. 1996; 3(4): 293-310. https://doi.org/10.1080/10238169608200202
    DORA PSI
  • Mesot J, Janssen S, Holitzner L, Hempelmann R
    FOCUS: Time-of-Flight spectrometer for cold neutrons at SINQ
    Journal of Neutron Research. 1996; 3.
    DORA PSI
  • Stuhr U, Striffler T, Wipf H, Natter H, Wettmann B, Janssen S, et al.
    An investigation of hydrogen diffusion in nanocrystalline Pd by neutron spectroscopy
    Journal of Alloys and Compounds. 1997; 253-254: 393-396. https://doi.org/10.1016/S0925-8388(96)03062-9
    DORA PSI
  • Ceretti M, Janssen S, McMorrow D, Radaelli P, Steigenberger U
    ECNS '99 - Young Scientists Forum
    Physica B: Condensed Matter. 2000; 276-278: 45-51. https://doi.org/10.1016/S0921-4526(99)01528-8
    DORA PSI
  • Rubio Temprano D, Mesot J, Janssen S, Conder K, Furrer A, Mutka H, et al.
    Large isotope effect on the pseudogap in the high-temperature superconductor HoBa2Cu4O8
    Physical Review Letters. 2000; 84(9): 1990-1993. https://doi.org/10.1103/PhysRevLett.84.1990
    DORA PSI
  • Basler R, Tregenna-Piggott PLW, Andres H, Dobe C, Güdel H-U, Janssen S, et al.
    Magnetic excitations of CsMn(SO4)2·12D2O, measured by inelastic neutron scattering
    Journal of the American Chemical Society. 2001; 123(14): 3377-3378. https://doi.org/10.1021/ja003801a
    DORA PSI
  • Magazù S, Villari V, Faraone A, Maisano G, Janssen S
    Effect of the monomer structure on the dynamics of semidilute polyalkylmethacrylate solutions: a quasielastic light and neutron scattering investigation
    Journal of Chemical Physics. 2002; 116(1): 427-435. https://doi.org/10.1063/1.1421355
    DORA PSI
  • Strässle T, Janssen S, Juranyi F, Furrer A, Moze O, Pecharsky AO, et al.
    Inelastic neutron scattering study of the intra-lanthanide alloys ErxPr1-x (x=0.6,0.8)
    Physical Review B. 2003; 68(13): 134411 (6 pp.). https://doi.org/10.1103/PhysRevB.68.134411
    DORA PSI
  • Strässle T, Juranyi F, Schneider M, Janssen S, Furrer A, Krämer KW, et al.
    Origin of higher order magnetic exchange: evidence for local dimer exchange striction in CsMn0.28Mg0.72Br3 probed by inelastic neutron scattering
    Physical Review Letters. 2004; 92(25): 257202 (4 pp.). https://doi.org/10.1103/PhysRevLett.92.257202
    DORA PSI
  • Staub U, Mulders AM, Zaharko O, Janssen S, Nakamura T, Lovesey SW
    Orbital dynamics of the 4f shell in DyB2C2
    Physical Review Letters. 2005; 94(3): 036408 (4 pp.). https://doi.org/10.1103/PhysRevLett.94.036408
    DORA PSI
  • Dahlborg U, Besser M, Calvo-Dahlborg M, Janssen S, Juranyi F, Kramer MJ, et al.
    Diffusion of Cu in AlCu alloys of different composition by quasielastic neutron scattering
    Journal of Non-Crystalline Solids. 2007; 353(32-40): 3295-3299. https://doi.org/10.1016/j.jnoncrysol.2007.05.074
    DORA PSI
  • Gutberlet T, Janssen S
    Where the users are and what the users do: a survey on NMI3 users
    Neutron News. 2014; 25(1): 43-46. https://doi.org/10.1080/10448632.2014.870805
    DORA PSI

Contact

Head of Division NUM
Dr. Alex Amato a.i.
Phone: +41-56-310-3232

Assistant
Renate Bercher
Phone: +41-56-310-3402
Fax: +41-56-310-3191

Postal address
Paul Scherrer Institut
Division NUM
WHGA/345
CH-5232 Villigen-PSI
Switzerland

PSI Accelerator Status

Protons Live Status

Open Positions

Job Opportunities at Research Division NUM.

Research Divisions and Labs

Overview of the scientific divisions of PSI.