Dr. Stefan Janssen

Head - User Office and Guest House
Stefan
Telefon
+41 56 310 28 75
Paul Scherrer Institute PSI
Forschungsstrasse 111
5232 Villigen PSI
Switzerland
Digitale Visitenkarte
Since 2010Head - PSI Guest House
Since 2004Head - PSI User Office
Since 2004Staff member and group leader PSI Center for Neutron and Muon Research CNM, formerly NUM
1999-2004Scientific staff member Laboratory for Neutron Scattering, PSI & ETHZ, spectroscopy group, responsible scientist for the time-of-flight spectrometer FOCUS at SINQ/PSI
1994-1999Scientific staff member University of Saarbrücken (DE), Physical Chemistry, in charge for building and operating the time-of-flight spectrometer FOCUS at SINQ/PSI
1991-1994Ph.D. thesis, Institut für Festkörperforschung IFF, Forschungszentrum Jülich and RWTH Aachen, DE
1985-1991studies 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
2018-2020Member OECD Global Science Forum Working Group "Optimising the operation and use of national research infrastructures"
2018-2025Member PSI "Personalkommission"
Since 2017Board member and PSI representative "Verein Studentisches Wohnen - Region Brugg/Windisch"
2015-2017Evaluation and review group: proposal selection and time allocation processes at European Southern Observatory ESO
2001-2009Scientific secretary and board member of the Swiss Neutron Scattering Society
Since 2001Scientific secretary of the SINQ Scientific Advisory Committee
Since 2001Swiss Physical Society SPG/SPS, CH
Since 1995Swiss Neutron Scattering Society SGN/SNSS, CH
1991-2010German Physical Society, DPG, DE

Publications since 1996

  • Veith M, Faber S, Hempelmann R, Janssen S, Prewo J, Eckerlebe H
    Synthesis and microstructure of nanostructured Al/Al2O3 (H)-composite
    Journal of Materials Science. 1996; 31(8): 2009-2017. https://doi.org/10.1007/BF00356620
    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
  • Janßen S, Wagner J, Natter H, Prewo J, Rupp R, Löffler J, et al.
    Small angle neutron scattering experiments on nanostructured matter using contrast variation
    Nanostructured Materials. 1997; 9(1-8): 327-330. https://doi.org/10.1016/S0965-9773(97)00075-5
    DORA PSI
  • Janßen S, Natter H, Hempelmann R, Striffler T, Stuhr U, Wipf H, et al.
    Hydrogen diffusion in nanocrystalline PD by means of quasielastic neutron scattering
    Nanostructured Materials. 1997; 9(1-8): 579-582. https://doi.org/10.1016/S0965-9773(97)00129-3
    DORA PSI
  • Wagner J, Janßen S, Hirscher M, Boesecke P, Hempelmann R
    Growth kinetics of nanocrystalline CuTi by means of time-resolved SAXS
    Berichte der Bunsengesellschaft für Physikalische Chemie. 1997; 101(11): 1738-1741. https://doi.org/10.1002/bbpc.19971011139
    DORA PSI
  • Janßen S, Mesot J, Holitzner L, Furrer A, Hampelmann R
    FOCUS: a hybrid TOF-spectrometer at SINQ
    In: Bauer GS, Boni P, Fischer P, eds. Proceedings of the first European conference on neutron scattering. Vol. 234-236. Physica B: condensed matter. sine loco: Elsevier; 1997:1174-1176. https://doi.org/10.1016/S0921-4526(97)00209-3
    DORA PSI
  • Wagner J, Janßen S, Rupp R, May R, Hempelmann R
    Characterization of nanoscale titanium nitride dispersions by small-angle neutron scattering
    Journal of the American Ceramic Society. 1998; 81(12): 3313-3317. https://doi.org/10.1111/j.1151-2916.1998.tb02773.x
    DORA PSI
  • Rubio Temprano D, Mesot J, Janssen S, Furrer A, Conder K, Mutka H, et al.
    Pseudogap in the underdoped high-temperature superconductor HoBa2Cu4O8: a neutron crystal-field study of the oxygen isotope effect
    Physica C: Superconductivity and its Applications. 2000; 341-348(2): 905-906. https://doi.org/10.1016/S0921-4534(00)00728-0
    DORA PSI
  • Janssen S, Altorfer F, Holitzner L, Hempelmann R
    Time-of-flight spectrometer FOCUS at SINQ: first results
    Physica B: Condensed Matter. 2000; 276-278: 89-90. https://doi.org/10.1016/S0921-4526(99)01253-3
    DORA PSI
  • Mesot J, Conder K, Janssen S, Mutka H, Furrer A, Rubio D
    Doping and isotope dependence of the pseudogap in high-Tc cuprates observed by neutron crystal-field spectroscopy: a fast local probe
    Journal of Superconductivity. 2000; 13(5): 727-730. https://doi.org/10.1023/A:1007806029650
    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
  • Janssen S, Rubio-Temprano D, Furrer A
    Time versus monochromatic focusing on a cold neutron time-of-flight spectrometer
    Physica B: Condensed Matter. 2000; 283(4): 355-360. https://doi.org/10.1016/S0921-4526(00)00338-0
    DORA PSI
  • Rubio Temprano D, Mesot J, Janssen S, Conder K, Furrer A, Sokolov A, et al.
    Large copper isotope effect on the pseudogap in the high-temperature superconductor HoBa2Cu4O8
    European Physical Journal B: Condensed Matter and Complex Systems. 2001; 19(1): 5-8. https://doi.org/10.1007/s100510170343
    DORA PSI
  • Beck C, Janssen S, Groß B, Hempelmann R
    Neutron time-of-flight spectrometer FOCUS at SINQ: Results from nanocrystalline matter studies
    Scripta Materialia. 2001; 44(8-9): 2309-2313. https://doi.org/10.1016/S1359-6462(01)00894-6
    DORA PSI
  • Temprano DR, Mesot J, Janssen S, Conder K, Furrer A, Sokolov A, et al.
    A neutron crystal-field study of the copper isotope effect on the pseudogap in the high-Tc cuprate HoBa2Cu4O8
    Journal of Alloys and Compounds. 2001; 323-324: 554-557. https://doi.org/10.1016/S0925-8388(01)01142-2
    DORA PSI
  • Andres H, Clemente-Juan JM, Basler R, Aebersold M, Güdel H-U, Borrás-Almenar JJ, et al.
    Magnetic polyoxometalates: anisotropic antiferro- and ferromagnetic exchange interactions in the pentameric cobalt(II) cluster [Co3W(D2O)2(CoW9O34)2]12-. A magnetic and inelastic neutron scattering study
    Inorganic Chemistry. 2001; 40(8): 1943-1950. https://doi.org/10.1021/ic001437a
    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
  • Rubio Temprano D, Mesot J, Janssen S, Conder K, Furrer A, Sokolov A, et al.
    Isotope effects on the pseudogap in high-temperature superconductors
    Applied Physics A: Materials Science and Processing. 2002; 74(Suppl. 1): S1630-S1634. https://doi.org/10.1007/s003390201795
    DORA PSI
  • Klausen SN, Lefmann K, McMorrow DF, Altorfer F, Janssen S, Lüthy M
    Simulations and experiments on RITA-2 at PSI
    Applied Physics A: Materials Science and Processing. 2002; 74(Suppl.): S1508-S1510. https://doi.org/10.1007/s003390201745
    DORA PSI
  • Jurányi F, Suck J-B, Janssen S
    Vibrational and magnetic properties of supersaturated Cu100-xFex
    Applied Physics A: Materials Science and Processing. 2002; 74(Suppl.): S972-S974. https://doi.org/10.1007/s003390101170
    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
  • Gutt C, Baumert J, Press W, Tse JS, Janssen S
    The vibrational properties of xenon hydrate: an inelastic incoherent neutron scattering study
    Journal of Chemical Physics. 2002; 116(9): 3795-3799. https://doi.org/10.1063/1.1446426
    DORA PSI
  • Foucat L, Renou J-P, Tengroth C, Janssen S, Middendorf HD
    Dynamics of proteins at low temperatures: fibrous vs. globular
    Applied Physics A: Materials Science and Processing. 2002; 74(Suppl.): S1290-S1292. https://doi.org/10.1007/s003390201828
    DORA PSI
  • Basler R, Chaboussant G, Sieber A, Andres H, Murrie M, Kögerler P, et al.
    Inelastic neutron scattering on three mixed-valence dodecanuclear polyoxovanadate clusters
    Inorganic Chemistry. 2002; 41(22): 5675-5685. https://doi.org/10.1021/ic0202099
    DORA PSI
  • Dobe C, Andres H-P, Tregenna-Piggott PLW, Mossin S, Weihe H, Janssen S
    Variable temperature inelastic neutron scattering study of chromium(II) Tutton salt: Manifestation of the 5E ⊗ e Jahn-Teller effect
    Chemical Physics Letters. 2002; 362(5-6): 387-396. https://doi.org/10.1016/S0009-2614(02)01131-4
    DORA PSI
  • Basler R, Chaboussant G, Cañada-Vilalta C, Christou G, Mutka H, Janssen S, et al.
    Magnetic and inelastic neutron scattering studies of a frustrated tetranuclear MN3+ butterfly-type cluster
    Polyhedron. 2003; 22(14-17): 2471-2479. https://doi.org/10.1016/S0277-5387(03)00245-6
    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
  • Ochsenbein ST, Chaboussant G, Sieber A, Güdel HU, Janssen S, Furrer A, et al.
    Magnetic cluster excitations in the antiferromagnetic phase of α-MnMoO4
    Physical Review B. 2003; 68(9): 092410 (4 pp.). https://doi.org/10.1103/PhysRevB.68.092410
    DORA PSI
  • Jurányi F, Janssen S, Mesot J, Holitzner L, Kägi C, Tuth R, et al.
    The new mica monochromator for the time-of-flight spectrometer FOCUS at SINQ
    Chemical Physics. 2003; 292(2-3): 495-499. https://doi.org/10.1016/S0301-0104(03)00175-7
    DORA PSI
  • Triolo A, Russina O, Arrighi V, Juranyi F, Janssen S, Gordon CM
    Quasielastic neutron scattering characterization of the relaxation processes in a room temperature ionic liquid
    Journal of Chemical Physics. 2003; 119(16): 8549-8557. https://doi.org/10.1063/1.1613637
    DORA PSI
  • Strässle T, Diviš M, Rusz J, Janssen S, Juranyi F, Sadykov R, et al.
    Crystal-field excitations in PrAl3 and NdAl3 at ambient and elevated pressure
    Journal of Physics: Condensed Matter. 2003; 15(19): 3257-3266. https://doi.org/10.1088/0953-8984/15/19/325
    DORA PSI
  • Baumert J, Gutt C, Shpakov VP, Tse JS, Krisch M, Müller M, et al.
    Lattice dynamics of methane and xenon hydrate: observation of symmetry-avoided crossing by experiment and theory
    Physical Review B. 2003; 68(17): 174301 (7 pp.). https://doi.org/10.1103/PhysRevB.68.174301
    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
  • Dobe C, Noble C, Carver G, Tregenna-Piggott PLW, McIntyre GJ, Barra A-L, et al.
    Electronic and molecular structure of high-spin d4 complexes: experimental and theoretical study of the [Cr(D2O)6]2+ cation in tutton's salts
    Journal of the American Chemical Society. 2004; 126(50): 16639-16652. https://doi.org/10.1021/ja046095c
    DORA PSI
  • Arrese-Igor S, Quintana I, Arbe A, Colmenero J, Alegría A, Frick B, et al.
    Microscopic dynamics in some engineering thermoplastics and a polymer membrane
    Physica B: Condensed Matter. 2004; 350(1-3 SUPPL. 1): e971-e973. https://doi.org/10.1016/j.physb.2004.03.268
    DORA PSI
  • Strunz P, Mortensen K, Janssen S
    SANS-II at SINQ: installation of the former Risø-SANS facility
    Physica B: Condensed Matter. 2004; 350(1-3): e783-e786. https://doi.org/10.1016/j.physb.2004.03.204
    DORA PSI
  • Boskovic C, Sieber A, Chaboussant G, Güdel HU, Ensling J, Wernsdorfer W, et al.
    Synthesis and characterization of a new family of bi-, tri-, tetra-, and pentanuclear ferric complexes
    Inorganic Chemistry. 2004; 43(16): 5053-5068. https://doi.org/10.1021/ic049600f
    DORA PSI
  • Herrmannsdörfer T, Dönni A, Fischer P, Keller L, Janssen S, Furrer A, et al.
    Magnetic neutron scattering from the rare-earth intermetallic compound system R3Pd20Si6 (R = rare earth)
    In: Andersson Y, Mittemeijer EJ, Welzel U, eds. European powder diffraction EPDIC 8. Vol. 443-444. Materials science forum. sine loco: Trans Tech Publications; 2004:233-238. https://doi.org/10.4028/www.scientific.net/MSF.443-444.233
    DORA PSI
  • Sieber A, Boskovic C, Bircher R, Waldmann O, Ochsenbein ST, Chaboussant G, et al.
    Synthesis and spectroscopic characterization of a new family of Ni4 spin clusters
    Inorganic Chemistry. 2005; 44(12): 4315-4325. https://doi.org/10.1021/ic050134j
    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
  • Mulders AM, Staub U, Zaharko O, Janssen S
    Magnetic field-induced orbital order in TbB2C2 observed by inelastic neutron scattering
    Physica B: Condensed Matter. 2005; 359-361: 1231-1233. https://doi.org/10.1016/j.physb.2005.01.367
    DORA PSI
  • Tripadus V, Radulescu A, Pieper J, Buchsteiner A, Podlesnyak A, Janssen S, et al.
    Molecular dynamics in triglycine sulphate by cold neutron spectroscopy
    Chemical Physics. 2006; 322(3): 323-330. https://doi.org/10.1016/j.chemphys.2005.08.042
    DORA PSI
  • Carver G, Dobe C, Jensen TB, Tregenna-Piggott PLW, Janssen S, Bill E, et al.
    Spectroscopic, magnetochemical, and crystallographic study of cesium iron phosphate hexahydrate: characterization of the electronic structure of the iron(II) hexa-aqua cation in a quasicubic environment
    Inorganic Chemistry. 2006; 45(12): 4695-4705. https://doi.org/10.1021/ic0601889
    DORA PSI
  • Jurányi F, Holitzner L, Schlumpf N, Greuter U, Gahl T, Janssen S, et al.
    The 2D small angle detector project at the FOCUS time-of-flight spectrometer at SINQ
    Journal of Neutron Research. 2006; 14(4): 333-338. https://doi.org/10.1080/10238160601048924
    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
  • Blau B, Clausen KN, Gvasaliya S, Janoschek M, Janssen S, Keller L, et al.
    The Swiss Spallation Neutron Source SINQ at Paul Scherrer Institut
    Neutron News. 2009; 20(3): 5-8. https://doi.org/10.1080/10448630903120387
    DORA PSI
  • Lehmann E, Janssen S, Clausen K
    "Imaging" at the 11th PSI Summer School - for the first time
    Neutron News. 2013; 24(1): 9-10. https://doi.org/10.1080/10448632.2013.750201
    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
  • Clausen KN, Janssen S
    The 14th PSI Summer School on Condensed Matter Research
    Neutron News. 2016; 27(1): 12-13. https://doi.org/10.1080/10448632.2016.1125727
    DORA PSI