Vacuum UV - Monochromator Spherical
Mirror - Plane Grating (SM-PGM) Beamline
This new kind of monochromator
allows to cover a wide spectral range with several plane
gratings and spherical mirrors with very high spectral resolution.
The energy scanning is realized by a simple grating rotation
allowing simple scanning mechanics and so high reproducibility.
The different mirrors permits to work with different incidence
angle and so to maintain high grating efficiency. The spherical
mirrors aberration is corrected with the non uniform groove
density (VLS grating), so the entrance and exit slit are
fixed.
The main characteristics of this kind of monochromator are:
-
High resolution and wide spectral range.
-
Fixed slits position.
-
Simple scanning mechanics (only one rotation).
SU8 beamline (SACO - LURE - Orsay -France)
SU8 Beamline Optical Layout
SU8 Beamline Side View
Main Characteristics
| Groove density (g/mm) |
Spectral range (nm) |
Spectral range (eV) |
1600 |
1.3-2.5 |
950-500 |
900 |
2-4.5 |
600-275 |
1300 |
4.1-8.9 |
300-140 |
600 |
8-20 |
155-62 |
1400 |
15.1-37.6 |
82-33 |
601 |
35.4-88.6 |
35-14 |
- 6 VLS gratings @ 3 different deviation angles
- Exit arm : 2400 mm
- Deviation angle : 174° - 170,2° - 160°
SU8 Beamline Characterization
1. Nitrogen absorption spectrum.
2. Neon absorption spectrum.
