Öffnet in neuem Fenster Opens in a new window Öffnet externe Seite Opens an external site Öffnet externe Seite in neuem Fenster Opens an external site in a new window

Joint Research Group Macromolecular Crystallography

Multi-axis Goniometry

enlarged view

Micro-diffractometer MD2 with mini-kappa installed at BL14.1

enlarged view

Diffraction image of an oriented thaumatin crystal.
The reciprocal lattice vector a* is aligned along the main rotation axis ω whereas c* points along the beam. 

Standard cell alignment           Alignment of reciprocal or direct unit cell vectors along the primary rotation axis or the beam. This scenario is mainly used to check the quality of the instrument calibration and derived orientation matrix.
Smart spot separation        With this option the optimal orientation is calculated for maximum spot separation while minimizing the impact of the blind region at the same time.
Smallest overall osc. range                               Using Smallest overall oscillation, the optimal orientations are calculated for minimizing the total angle of the data collection wedge, being useful for radiation sensitive crystals.
Multi-crystal reference               Within this option, the orientation of a previously mounted crystal is fetched to allow for the alignment of a similar but freshly mounted crystal in the same orientation. This scenario enables the combination of diffraction data from a multitude of isomorphous crystals of the same macromolecule in a very effective way.
Anomalous data collection Within this scenario, a 2-, 4-, or 6-fold axis is aligned along the primary rotation axis to minimize systematic errors in recording the weak anomalous signal.