Photophysics beam line is a medium resolution VUV beam line. This beamline uses a toroidal mirror to focus the SR beam from Indus-1 on to the entrance slit of a one-meter Seya-Namioka monochromator. An ion etched 2400g/mm grating is being used as a dispersing element in the monochromator of the beam line. The monochromatic light coming out of the monochromator is focused by another toroidal mirror (M2) at a distance of ~ one meter. Optical layout and photograph of the beamline are shown in Figure.
Experimental Station
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Optical configuration:
| Acceptance |
41 mrad (H) x 5.6 mrad (V) |
| Mirror 1 |
Toroidal mirror (Au coating) |
| Monochromator |
1m Seya-Namioka type with spherical grating (gold coating) |
| Mirror 2 |
Toroidal mirror (gold coating) |
| Spot size |
1mm (H) and 1 mm (V) (for solid samples) |
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6mm X 8mm (Cell) (for gas phase experiments) |
| Photon flux |
108 Phot/sec |
| Operating range |
1100 - 3500 Ĺ (Gas phase absorption Experiments)
500 - 3500A (Absorption experiments for solids)
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| Detection |
Sodium Salycilate coated window with VUV to visible
sensitive photomultliplier (9425QB, ET)
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