BL 7-2
Beam line 7-2 is dedicated to micro-focus hard x-ray imaging and micro x-ray absorption spectroscopy
Ideal for obtaining elemental maps of large samples (~1 cm - 1 m) as well as performing spectroscopy on selected points in the sample
Beam line specifications
Upstream
Source: 20 pole, 2-Tesla Wiggler, 0.5 mrad acceptance
Monochromator: Water cooled, double crystal Si(111)
Energy range: 4.9 - 16.5 keV focussed
Resolution: < 3x10^4 DeltaE/E
Experimental hutch
Beam size: 35 and 65 micron capillary focusing optics OR 25, 50, and 100 micron pin holes
Flux: < 10^12 photons/sec
Detector: Seven element Hitachi Vortex
Detection system: Quantum Detectors Xspress3
Max count rate: 3 million counts per second
Practical element detection: SiK - SrK, many L-edges (concentration dependent)
Samples
Environment: Ambient temperature and pressure; air-free environment possible
Sample mounting:
Standard sample mounts can accommodate ~40 thin sections. Specialized sample mounts are available for thick samples, including fossils
Calibration Foils:
Purpose: These foils are available as concentration standards so you can obtain quantitive elemental distributions (see SMAK tutorial on quantification)
Standards & Concentrations: if you measured foils at the beamline, here is the key:
Row 1
Standard Concentration (ug/cm2)
Pb 46.1
Au 47.6
SrF 246.3
AgHg 42.5
WO 354
GdF 353.7
MoO 351.7
Row 2
Standard Concentration (ug/cm2)
CuSx 51.2 *(Individual concentrations given for Cu: 39.4 ug/cm2 and S: 11.8 ug/cm2)
Se 46.4
CaF2 56.8
ZnTe 45.8
Ni 55.4
Co 45
Mn 47.1
Fe 56
Row 3
Standard Concentration (ug/cm2)
GaAs 47.3
Cr 48.3
V 55.6
Ti 50.4
YP 348.2
SiO 48.8
CsBr 50.5
Row 4
Standard Concentration (ug/cm2)
LaF 347.6
TiCl 39.7
ZrF 434.49
GaP 47
KCl 49.1