Publications 2007 and earlier

2007

• Christoph Kolano, Jan Helbing, Götz Bucher, Wolfram Sander and Peter Hamm. Intramolecular Disulfide Bridges as a Phototrigger To Monitor the Dynamics of Small Cyclic Peptides. J. Phys. Chem. B 111 , 11297-11302 (2007).
  
• Jens Bredenbeck, Jan Helbing, Christoph Kolano and Peter Hamm. Ultrafast 2D-IR Spectroscopy of Transient Species. ChemPhysChem 8, 1747-1756 (2007).
  
• Valentina Cervetto, Rolf Pfister, Christoph Kolano, Harald Bregy, Heinz Heimgartner, and Jan Helbing. Coexistence of Cyclic H-Bonded and Open Tetrapeptide Conformation. Chemistry - A European Journal 13, 9004-9011 (2007).
  
• Janne A. Ihalainen, Jens Bredenbeck, Rolf Pfister, Jan Helbing, Lei Chi y, Ivo H.M. van Stokkum , G. Andrew Woolley, Peter Hamm . Folding and unfolding of a photoswitchable peptide from picoseconds to microseconds - A time-resolved IR study. Proceedings of the National Academy of Science U.S.A. 104, 5383-5388 (2007).
  
• Jens Bredenbeck, Jan Helbing, Karin Nienhaus, G. Ulrich Nienhaus, Peter Hamm. Protein Ligand Migration Mapped by Nonequilibrium 2D-IR Exchange Spectroscopy. Proceedings of the National Academy of Science U.S.A. 104, 14243-14248 (2007).
  

2006

• Christoph Kolano, Jan Helbing, Mariusz Kozinski, Wolfram Sander & Peter Hamm. Watching hydrogen-bond dynamics in a b -turn by Transient 2D-IR Spectroscopy. Nature (London) 444 (7118), 469-472 (2006)
  
• Valentina Cervetto, Harald Bregy, Peter Hamm, Jan Helbing. Time-resolved IR spectroscopy of N-Methylthioacetamide: trans -> cis isomerization upon n- p * and p-p * excitation and cis->trans photoreaction. The Journal of Physical Chemistry A, 110 , 11473-11478 (2006)
  
• Peter Hamm, Jan Helbing, Jens Bredenbeck. Stretched versus compressed exponential kinetics in a -helix folding. Chemical Physics 323, 54-65 (2006).

2005

• Jan Helbing, Karin Nienhaus, G. Ulrich Nienhaus, Peter Hamm. Restricted Rotational Motion of CO in a Protein Internal Cavity: Evidence for Non-Separating Correlation Functions from IR Pump-Probe Spectroscopy. Journal of Chemical Physics. 122, 124505 (2005).
  
• Jens Bredenbeck, Jan Helbing, Peter Hamm. Solvation Dynamics: Beyond the Two-Point Frequency Fluctuation Correlation function. Physical Review Letters 95, 083201 (2005).
  
• Jens Bredenbeck, Jan Helbing, Janet R. Kumita, G. Andrew Wooley, Peter Hamm. a -helix formation in a photoswitchable peptide tracked from picoseconds to microseconds by time resolved IR spectroscopy. Proceedings of the National Academy of Science U.S.A. 102, 2379-2384 (2005).

2004

• Jens Bredenbeck, Jan Helbing, Peter Hamm. Continous scanning from picoseconds to microseconds in time resolved linear and non-linear spectroscopy. Review of Scientific Instruments 75, 4462-4466 (2004).
  
• Jens Bredenbeck, Jan Helbing, Peter Hamm. Transient 2D-IR spectroscopy - exploring thepolarization dependence. Journal of Chemical Physics 121, 5943-5957 (2004).
  
• Valentina Cervetto, Jan Helbing, Jens Bredenbeck, Peter Hamm. Double-resonance versus pulsed Fourier transform 2D-IR spectroscopy: An experimental and theoretical comparison. Journal of Chemical Physics 121, 5935-5942 (2004).
  
• Jan Helbing, Luigi Bonacina, Ruth Pietri, Jens Bredenbeck, Peter Hamm, Frank van Mourik, Frédéric Chaussard, Alejandro Gonzalez-Gonzalez, Majed Chergui , Cacimar Ramos-Alvarez, Carlos Ruiz, Juan López-Garriga. Time-resolved visible and infrared study of the cyano complexes of Myoglobin and of Hemoglobin I from Lucina pectinata. Biophysical Journal 87, 1881-1891 (2004).
  
• Jan Helbing, Harald Bregy, Jens Bredenbeck, Rolf Pfister, Peter Hamm, Robert Huber, Josef Wachtveitl, Luca De Vico, Massimo Olivucci. A Fast Photoswitch for Minimally Perturbed Peptides: Investigation of the trans -> cis Photoisomerization of N-Methylthioacetamide. Journal of the American Chemical Society 126, 8823-8834 (2004).
  
• Marc Hostettler, Dieter Schwarzenbach, Jan Helbing, Vladimir Dmitriev, Hans-Peter Weber. Structure and SHG of the high pressure phase IV of HgBr₂ . Solid State Communications 129, 359-363 (2004).
  
• Jens Bredenbeck, Jan Helbing, Peter Hamm. Labeling Vibrations by Light: Ultrafast Transient Infrared Spectroscopy Tracks Vibrational Modes During Photoinduced Charge Transfer. Journal of the American Chemical Society 126, 990-991 (2004).

2003

• Jens Bredenbeck, Jan Helbing, Christian Renner, Raymond Behrendt, Luis Moroder, Josef Wachtveitl, Peter Hamm. Transient 2D-IR spectroscopy- Snapshots of the non-equilibrium ensemble during the picosecond conformational transition of a small peptide . Journal of Physical Chemistry B, 107, 8654-8660 (2003).
  
• Jens Bredenbeck, Jan Helbing, Arne Sieg, Tobias Schrader, Wolfgang Zinth, Christian Renner, Raymond Behrendt, Luis Moroder, Josef Wachtveitl, Peter Hamm. Picosecond conformational transition and equilibration of a cyclic peptide. Proceedings of the National Academy of Science U.S.A. 100, 6452 (2003). Corrigendum ibid 100, 10580 (2003).

Earlier work

• C. R. González, S. Fernández-Alberti, J. Echave, J. Helbing, M. Chergui. Simulations of the absorption band of the D-State of Hg₂ in rare gas matrices. Chemical Physics Letters 367, 651-656 (2003).
  
• J. Helbing and M. Chergui. Luminescence of ion-pair and spin-excited states of I₂ in solid xenon. Journal of Luminescence, 94-95, 611 (2001).
  
• J. Helbing and M. Chergui. Solvation of ion-pair states in non-polar media: I₂ in solid Neon, Argon and Krypton. Journal of Chemical Physics, 115, 6158 (2001).
  
• J. Helbing, M. Chergui, S. Fernandez-Alberti, J. Echave, N. Halberstadt and J. A. Beswick. Caging and excited state emission of ICN trapped in cryogenic matrices: experiment and theory . Physical Chemistry Chemical Physics 2, 4131 (2000).
  
• J. Helbing and M. Chergui. Spectroscopy and photo-induced dynamics of ICN and its photo-products in solid argon. Journal of Physical Chemistry 104, 10293 (2000).
  
• J. Helbing, M. Chergui and A. Haydar. Spectroscopy and energy relaxation processes of Hg-doped neon, argon and xenon. Journal of Chemical Physics 113, 3621 (2000).
  
• J. Helbing, A.Haydar and M. Chergui. Spectroscopy and energy relaxation processes of Hg₂ and Hg in solid Ne. Chemical Physics Letters 310, 43051 (1999).
  
• A. Assion, T. Baumert, J. Helbing, V. Seyfried and G. Gerber. Femtosecond time-resolved observation of above-threshold ionization in Na₂. Physical Review A 55, 1899 (1997).
  
• A. Assion, M. Geisler, J. Helbing, V. Seyfried and T. Baumert. Femtosecond pump-probe photoelectron spectroscopy: Mapping of vibrational wave-packet motion. Physical Review A 54, R4605 (1996).
  
• A. Assion, T. Baumert, J. Helbing, V. Seyfried und G. Gerber. Coherent control by a single phase shaped femtosecond laser pulse . Chemical Physics Letters 259, 488 (1996).