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Beamline: I (SUPERLUMI)
Experiment for VUV luminescence and reflection Spectroscopy
Beamline I with SUPERLUMI is a unique setup SR-worldwide which is used by about 15 groups from all over Europe.
The central features of this beamline are its very large horizontal acceptance. The entrance optics consists of two mirrors for separate vertical and horizontal focusing. The first, cylindrical mirror is located at a distance of 4.3 m from the source and accepts 50 mrad of the horizontal divergence. This gives a 10 mm wide image at t he entrance slit of the monochromator. The second, plane elliptic mirror focuses the 2.2 mrad vertical divergence to 0.1 mm at the entrance slit of the monochromator. Both mirrors can be aligned by remote control.
Primary 2 m normal incidence monochromator in 15° Mc Pherson mounting covers the working UV and VUV spectral range from 3.7 eV to 40 eV. The monochromator is equipped with two holographic concave gratings (1200 groves/mm), which can be interchanged in situ. These gratings are optimized for different wavelength ranges by Pt and Al+MgF2 coatings.
The resolution interval range is between 0.02 nm and 0.3 nm. One can choose between three different fixed entrance slits of 0.03, 0.1 and 0.5 mm in width. With appropriate exit slit, this corresponds to a resolution of 0.02 nm, 0.05 nm and 0.32 nm, respectively.
The monochromator has two exit arms which can be used alternately by moving a plane mirror into the light path. With a second exit arm, the monochromator serves not only SUPERLUMI but also the cluster experiment (CLULU).
Applications
- VUV-fluorescence spectroscopy
- Photon-stimulated desorption
- Cluster beam spectroscopy
