MEX technical summary

Owned by AS Spectroscopy (Unlicensed)
Last updated: Apr 04, 2024 by AS Spectroscopy Wiki
2 min read

The design capabilities of MEX1 and MEX2 are shown in the table below. Please consult the user wiki page for current and timelin for the rollout of capabilities.

 

MEX-1

MEX-2

Beam energy

Monochromatic, 3.4 – 13.6 keV

 

Monochromatic 2.1 – 3.2 keV

Number of Endstations

2

1

Source

 Bending magnet (BM12-1)

Bending magnet (BM12-1)

Optics

Mirror 1 (M1)

Vertical collimation

  •  Fixed, flat Si substrate

  • Cylindrically bent

  • Bounce up (4.75 mrad)

  • Exchangeable Si, Ni and Rh stripes

Front end mirror (M1)

Vertical collimation

  • Fixed sagittal cylinder

  • Horizontal bounce (15 mrad)

  • Cr stripe

 

Double crystal monochromator

  • Two pairs of Si<111>:

    • Crystal azimuth 0° and 30°

  • dE/E ≈ 1.4 ×10-4

  • Vertical bounce up

Mirror 2 (M2)

Horizontal collimating

  • Fixed cylinder

  • Horizontal bounce (15 mrad)

  • Cr stripe

 

Mirror 2 (M2)

Vertical and horizontal focussing

  • Cylindrical + flat Si substrate

  • Elliptically bent

  • Bounce down (4.75 mrad)

  • Exchangeable B4C and Rh stripes

Double crystal monochromator

  • Si<111>, dE/E ≈ 1.4 ×10-4

  • InSb<111>, dE/E ≈ 3 ×10-4

  • Crystal azimuth 0°

  • Vertical bounce

 Endstations

XAFS Station

  • EXAFS/XANES

  • 3.4 – 13.8 keV

  • Transmission and florescence (4 element Si EDS detector)

  • Sample temperature 10 – 300 K (in He(g))

  • Non-ambient sample environments

  • Beam size

    • 0.15 – 0.5 mm vertical

    • 0.1 – 7 mm horizontal

  • Flux 3 x 1011 ph-1 sec-1

“Low energy station”

  • EXAFS/XANES

  • 2.1 – 3.2 keV

  • Transmission, drain current and fluorescence (4 el. Si SDD)

  • HERFD-XAS: >Dispersive refocusing Rowland geometry

>Single cylindrically bent, Si<111> Johann analyser

  • Beam size 0.1 – 3 x 0.1 – 5 mm2

  • Flux: Si<111> 5 x 1010 ph-1 sec-1

InSb<111> 1 x 1011 ph-1 sec-1

  • Sample in He(g) or vacuum

  • Sample temperature 10 – 500K

 

Microprobe station (coming in 2024)

  • µEXAFS/µXANES

  • 2.1 – 13.6 keV

  • 3 el. Si SDD

  • 2-moment KB mirror system

  • Exchangeable Si and Rh stripes

  • Beam size: 3 – >20 µm

  • Flux 108 ph-1 sec-1 µm2

  • Sample in He(g)

  • Sample temperature 80 – 500K

  • Scan range < 80 × 80 mm

 

 

Crystal spectrometer