Oliver S. Wenger, Sara García-Revilla, Hans U. Güdel, Harry B. Gray and Rafael Valiente
Pressure dependence of Pt(2,2'-bipyridine)Cl₂ luminescence. The red complex converts to a yellow form at 17.5 kbar
Chem. Phys. Lett. 384, 190-192 (2004)      Abstract                 

Christine Reinhard, Karl Krämer, Daniel A. Biner and Hans U. Güdel
Cooperative radiative and nonradiative effects in K₂NaScF₆ codoped with V³⁺ and Er³⁺
J. Chem. Phys. 120, 3374-3380 (2004)      Abstract                 

Christine Reinhard, Pascal Gerner, Fernando Rodríguez, Sara García-Revilla, Rafael Valiente and Hans U. Güdel
Near-infrared to green photon upconversion in Mn²⁺ and Yb³⁺ doped lattices
Chem. Phys. Lett. 386, 132-136 (2004)      Abstract                 

A. Bessière, P. Dorenbos, C. W. E. van Eijk, L. Pidol, K. W. Krämer and Hans U. Güdel
Spectroscopy and anomalous emission of Ce doped elpasolite Cs₂LiYCl₆
J. Phys.: Condens. Matter, 16, 1887-1897 (2004)      Abstract                 

Karl W. Krämer, Daniel Biner, Gabriela Frei, Hans U. Güdel, Markus P. Hehlen and Stefan R. Lüthi
Hexagonal Sodium Yttrium Fluoride Based Green and Blue Emitting Upconversion Phosphors
Chem. Mater. 16, 1244-1251 (2004)      Abstract                 

G. Chaboussant, S. T. Ochsenbein, A. Sieber, H.-U. Güdel, H. Mutka, A. Müller and B. Barbara
Mechanism of ground-state selection in the frustrated molecular spin cluster V₁₅
Europhys. Lett. 66, 423-429 (2004)      Abstract                 

D. Schaniel, T. Woike, C. Boskovic and H.-U. Güdel
Evidence for two light-induced metastable states in Cl₃[Ru(NH₃)₅NO]H₂O
Chem. Phys. Lett. 390, 347-351 (2004)      Abstract                 

G. Chaboussant, S. T. Ochsenbein, A. Sieber, R. Bircher, H.-U. Güdel, B. Barbara, A. Müller and H. Mutka
Magnetic field reveals nature of quantum spin state in the molecular spin cluster V₁₅
ILL Annual Report 2003, 18-19 (2004)      Abstract                 

Curtis P. Berlinguette, Alina Dragulescu-Andrasi, Andreas Sieber, José Ramón Galán-Mascarós, Hans-Ulrich Güdel, Catalina Achim and Kim R. Dunbar
A Charge-Transfer-Induced Spin Transition in the Discrete Cyanide-Bridged Complex {[Co(tmphen)₂]₃[Fe(CN)₆]₂}
J. Am. Chem. Soc. 126, 6222-6223 (2004)      Abstract                             

Annina Aebischer and Hans U. Güdel
Host sensitized near infrared to visible photon upconversion in 1% Re⁴⁺ doped Cs₂NaYbBr₆
J. Alloys Comp. 374, 60-62 (2004)      Abstract                 

Christine Reinhard, Karl Krämer, Daniel A. Biner and Hans-Ulrich Güdel
V³⁺ sensitized upconversion in Cs₂NaScCl₆:Pr³⁺;V³⁺ and K₂NaScF₆:Er³⁺;V³⁺
J. Alloys Comp. 134, 133-136 (2004)      Abstract                 

Rachel Shaw, Ian S. Tidmarsh, Rebecca H. Laye, Barbara Breeze, Madeleine Helliwell, Euan K. Brechin, Sarah L. Heath, Mark Murrie, Stefan Ochsenbein, Hans-Ulrich Güdel and Eric J. L. McInne
Supertetrahedral decametallic Ni(II) clusters directed by m₆-tris-alkoxides
Chem. Commun. 1418-1419 (2004)      Abstract                 

Ch. Rüegg, N. Cavadini, A. Furrer, K. Krämer, H.-U. Güdel, P. Vorderwisch, K. Habicht, H. Mutka and A. Wildes
Spin dynamics in the BEC phase of the S=1/2 quantum spin system TlCuCl₃
J. Magn. Magn. Mater. 272-276, 195-196 (2004)      Abstract                 

Th. Strässle, F. Juranyi, M. Schneider, S. Janssen, A. Furrer, K. W. Krämer and H. U. Güdel
Origin of Higher Order Magnetic Exchange: Evidence for Local Dimer Exchange Striction in CsMn_0.28Mg_0.72Br₃ Probed by Inelastic Neutron Scattering
Phys. Rev. Lett. 92, 257202/1-4 (2004)      Abstract                 

Ch. Rüegg, M. Oettli, J. Schefer, O. Zaharko, A. Furrer, H. Tanaka, K. W. Krämer, H.-U. Güdel, P. Vorderwisch, K. Habicht, T. Polinski and M. Meissner
Neutron Scattering Study of the Field-Dependent Ground State and the Spin Dynamics in Spin-One-Half NH₄CuCl₃
Phys. Rev. Lett. 93, 037207/1-4 (2004)      Abstract                 

Colette Boskovic, Andreas Sieber, Grégory Chaboussant, Hans U. Güdel, Jürgen Ensling, Wolfgang Wernsdorfer, Antonia Neels, Gael Labat, Helen Stoeckli-Evans and Stefan Janssen
Synthesis and Characterization of a New Family of Bi-, Tri-, Tetra-, and Pentanuclear Ferric Complexes
Inorg. Chem. 43, 5053-5068 (2004)      Abstract                             

Grégory Chaboussant, Reto Basler, Hans-Ulrich Güdel, Stefan Ochsenbein, Andrew Parkin, Simon Parsons, Gopalan Rajaraman, Andreas Sieber, Andrew A. Smith, Grigore A. Timco and Richard E. P. Winpenny
Nickel pivalate complexes: structural variations and magnetic susceptibility and inelastic neutron scattering studies
Dalton Trans. 2758-2766 (2004)      Abstract                 

G. Chaboussant, R. Basler, A. Sieber, S. T. Ochsenbein and H.-U. Güdel
Neutron scattering studies of magnetic molecular spin clusters
Physica B 350, e51-e54 (2004)      Abstract                 

Pascal Gerner, Christine Reinhard and Hans U. Güdel
Cooperative Near-IR to Visible Photon Upconversion in Yb³⁺-Doped MnCl₂ and MnBr₂: Comparison with a Series of Yb³⁺-Doped Mn²⁺ Halides
Chem. Eur. J. 10, 4735-4741 (2004)      Abstract                 

G. Chaboussant, A. Sieber, S. Ochsenbein, H.-U. Güdel, M. Murrie, A. Honecker, N. Fukushima and B. Normand
Exchange interactions and high-energy spin states in Mn₁₂-acetate
Phys. Rev. B 70, 104422/1-16 (2004)      Abstract                 

Pascal Gerner, Cyril Fuhrer, Christine Reinhard and Hans U. Güdel
Near-infrared to visible photon upconversion in Mn²⁺ and Yb³⁺ containing materials
J. Alloys Comp. 380, 39-44 (2004)      Abstract                 

Oliver S. Wenger and Hans U. Güdel
Influence of Crystal Field Parameters on Near-Infrared to Visible Photon Upconversion in Ti ²⁺ and Ni ²⁺ Doped Halide Lattices
Structure and Bonding 106, 59-70 (2004)      Abstract                 

Hans Ulrich Güdel
Eine neue Familie von Szintillatoren - Präzisere Messung von Gamma- und Röntgenstrahlen
Neue Zürcher Zeitung, 17. November 2004, Forschung·Technik, Seite 61      Abstract                 

A. Bessière, P. Dorenbos, C. W. E. van Eijk, K. Krämer and H. U. Güdel
New thermal neutron scintillators: Cs₂LiYCl₆ : Ce³⁺ and Cs₂LiYBr₆ : Ce³⁺
IEEE Trans. Nucl. Sci. 51, 2970-2972 (2004)      Abstract                 

Andreas Sieber, Grégory Chaboussant, Roland Bircher, Colette Boskovic, Hans U. Güdel, George Christou and Hannu Mutka
Pressure dependence of the magnetic anisotropy in the single-molecule magnet Mn₄O₃Br(OAc)₃(dbm)₃
Phys. Rev. B 70, 172413/1-4 (2004)      Abstract                 

Ch. Rüegg, A. Furrer, D. Sheptyakov, Th. Strässle, K. W. Krämer, H.-U. Güdel and L. Mélési
Pressure-Induced Quantum Phase Transition in the Spin-Liquid TlCuCl₃
Phys. Rev. Lett. 93, 257201/1-4 (2004)      Abstract                 

G. Chaboussant, S. T. Ochsenbein, A. Sieber, H.-U. Güdel, B. Barbara, A. Müller and H. Mutka
Probing mixing of quantum spin states in frustrated molecular magnets with neutron scattering
Phys. Stat. Sol. C 1, 3399-3401 (2004)      Abstract                 

Roland Bircher, Grégory Chaboussant, Andreas Sieber, Hans U. Güdel and Hannu Mutka
Transverse magnetic anisotropy in Mn₁₂ acetate: Direct determination by inelastic neutron scattering
Phys. Rev. B 70, 212413/1-4 (2004)      Abstract                 

Stephan Heer, Karsten Kömpe, Hans-Ulrich Güdel and Markus Haase
Highly Efficient Multicolour Upconversion Emission in Transparent Colloids of Lanthanide-Doped NaYF₄ Nanocrystals
Adv. Mater. 16, 2102-2105 (2004)      Abstract                       

P. Dorenbos, C. W. E. van Eijk, H. U. Güdel, E. V. D. van Loef and K. W. Krämer
Cristaux scintillateurs du type iodure de terre rare
French patent no. FR 2855830-A1, 10.12.2004      Abstract                 

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