XES350

The Scienta XES 350 is a state-of-the-art soft X-ray emission spectrometer. It is a grazing incidence spectrometer covering a wide energy range, 50 -1000 eV, at high resolution and sensitivity [J. Nordgren et al., Rev. Sci. Instr. 60, 1690 (1989)]. The Scienta XES 350 is easily adapted to different excitation sources, since the instrument is flange mounted and has an optical axis that is easily adjusted to the excitation source.

The Scienta XES 350 optical arrangement consists of a variable entrance slit, two moveable shutters for grating selection, three spherical gratings, and a 2-D detector that can be moved in a three-axis coordinate system. The Scienta XES 350 can be described as three spectrometers merged into one by having a common entrance slit and a detector that can be aligned to the focal curve (Rowland circle) of the selected grating. The instrument is equipped with a digital CCD-camera data read-out.

Specifications:

- Variable entrance slit:  0 - 90 micrometer
  (controlled by a 1” linear manual feedthrough)
- Variable grating illumination width: 0 - 4.5 cm
  (controlled by 2 linear 1” manual feedthroughs)
- Adjustable optical axis:  ±2°
- Detector rotation: 15°
- Manual (or motor controlled, optionally) XY-tables (400 and 100 mm) with optical scales for positioning of the detector.

Gratings:

3 Ion-etched, holographically recorded concave spherical diffraction gratings.

Material:
Fused Silica

Dimensions: 
45x35x15 with mounting steps

Figure: 
<Lambda/10

Surface Roughness: 
<10 Å RMS

Grating #1: R=5 m
 Groove Density:  2400 l/mm.

Grating #2: R=5 m
 Groove Density:  1200 l/mm.

Grating #3: R=5 m
 Groove Density:  600 l/mm.

Detector:
2-D MCP detector with digital CCD-camera read-out, efficiency enhanced by CsI coating.