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Tuesday, 20 October 2009 08:27

 

Magnetic spectroscopy

 

Scientific disciplines: Magnetism, materials science

 

Endstations:

 

GENERAL BEAMLINE INFORMATION
Operational Yes
Proposal cycle Proposals for General Sciences Beamlines (6-month cycle)

Source characteristics

5.0-cm period elliptical polarization undulator (EPU5)

Energy range

100-2000 eV

Monochromator

Variable-included-angle PGM

Calculated flux (1.9 GeV, 400 mA)

1 x 1013 photons/s/0.1%BW at 800 eV [Value reported is the merit function, flux = total flux x (degree of circular polarization)2.]

Resolving power (E/ΔE)

5,000-10,000 (at source-size limit; energy-dependent)
>25,000 (64 eV, 10-mm entrance/exit slits)

Special notes

Polarization is user selectable; linear polarization continuously variable from horizontal to vertical; left and right elliptical (or circular) polarization.

Local contact

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Advanced Light Source, Berkeley Lab
Phone: (510) 486-4834
Fax: (510) 486-7588

 

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Advanced Light Source, Berkeley Lab

Phone: (510) 486-5926

Beamline phone number

(510) 495-2041

Website

http://ssg.als.lbl.gov/ssgdirectory/arenholz/BL402.html

 

ENDSTATION INFORMATION

Endstation name

Eight-pole electromagnet

Characteristics

Magnetic fields up to 0.9 T can be applied in any direction relative to the incoming x-ray beam

Detectors

Total electron yield, total fluorescence yield, transmission

Spot size at sample

100 micron x 100 micron or larger

Samples

Solid samples

Sample environment

10-6 to 10-9 Torr, 15 to 450 K

Scientific applications

Spectroscopy on ferro- and antiferromagnetic materials

Experimental techniques

XAS, XMCD, XMLD measurements

 

ENDSTATION INFORMATION

Endstation name

XMCD chamber (6T, 2K)

Characteristics

6-Tesla superconducting magnet, 2 K sample temperature

Detectors

30-element germanium fluorescence detector; sample current

Spot size at sample

100 micron x 100 micron or larger

Samples

Solids, powders, dried liquid films up to 5 x 5 mm

Sample environment

UHV

Scientific applications

Spectroscopy on proteins and model compounds, active sites in metalloproteins, enzymatic mechanisms

Experimental techniques

XMCD, L-edge spectroscopy

 

ENDSTATION INFORMATION

Endstation name

L-edge chamber with superconducting spectrometer

Detectors

Array superconducting tunnel junction fluorescence detector; sample current

Spot size at sample

100 micron x 100 micron or larger

Samples

Solids, powders, dried up liquid films up to 5 x 5 mm

Sample preparation

Proteins dried on Al2O3 disks, often in inert atmosphere; model compounds usually as powder on carbon tape

Sample environment

UHV, (10-8 to 10-9 Torr), cooling down to ~15 K possible

Special notes

Also analysis of wet and/or air-sensitive samples

Scientific applications

Active sites in metalloproteins, enzymatic mechanisms

Experimental techniques

Fluorescence-detected absorption spectroscopy