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: 25, 50, and 100 micron capillary focusing optics OR 25, 50, and 100 micron pin holes

Flux: < 10^12 photons/sec

Detector: Four 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

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         4.3

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

CONTACT:

Sam Webb

samwebb@sams-xrays.com

 

© 2018 by Sam Webb.

 

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