Research Activities of the MoNOS Group

The two main research directions of the group, EPR (electron paramagnetic
resonance) and optical spectroscopy both stem from earlier studies of the
photogenerated paramagnetic triplet state, either by regular EPR or by
optically detected magnetic resonance (ODMR). These two domains are now largely
independent within the group, although collaborations are frequent.


Single-Molecule Optics

The single-molecule group (M. Orrit, E.J.J. Groenen) uses spectroscopy and
microscopy to select and investigate individual molecules, either at cryogenic
temperatures with high-resolution lasers, or at room temperature with confocal
microscopes. A single molecule gives direct access to atomic and molecular
scales. The main advantage of the method is the perfect elimination of all
ensemble- or time-averages. The method has many potential applications in basic
physical chemistry, material science, molecular biochemistry and biophysics.


Electronic Structure and Function by EPR

The EPR Group (P. Gast, E.J.J. Groenen, M. Huber) investigates the electronic
structure and dynamics of (bio)molecules and paramagnetic centers in solids.
The development of EPR instrumentation and methodology and the study of
particular systems are entangled activities. Instrumental limitations that show
up during the study of a specific centre initiate the development of new
hardware. New hardware enables the study of systems not amenable by EPR before.


High-Resolution and Hole-Burning Spectroscopy

The hole-burning group (S. Völker) uses high-resolution spectroscopy to explore the structure and dynamics of complex systems. High-purity laser sources,
combined with low temperatures select a sub-population of centres in the broad
band of a large population. The recent activity of the group is centered on
auto-fluorescent proteins, studied by conventional optical spectroscopy,
spectral hole-burning and single molecule spectroscopy.