Operational

Fall 2002

Source characteristics

5-cm-period elliptical polarization undulator (EPU5)

Energy range

See endstation tables

Monochromator

See endstation tables

Endstations

Wet spectroscopy
Scanning transmission x-ray microscope (STXM)

Endstation

Wet spectroscopy

Energy range

75-2000 eV

Monochromator

Variable-included-angle PGM

Calculated flux (1.9 GeV, 400 mA)

~10¹² photons/s

Resolving power (E/DE)

2500-7500

Spot size at sample (FWHM)

5 x 50 µm

Sample environment

UHV, wet environments

Scientific applications

Wet molecular environmental science

Experimental techniques

XPS, NEXAFS, fluorescence spectroscopy

Local contact/spokesperson

Name: David Shuh
Affiliation: Chemical Sciences Division, Berkeley Lab
Phone: (510) 486-6937
Fax: (510) 486-5596
Email: dkshuh@lbl.gov

Endstation

Scanning transmission x-ray microscope (STXM)

Energy range

180-1000 eV

Monochromator

Variable-included-angle PGM

Calculated flux (1.9 GeV, 400 mA)

~10⁹ photons/s/0.01% BW

Resolving power (E/DE)

3000 (typical), 5000 (optimized)

Characteristics

Used to make x-ray images and NEXAFS spectra of thin samples in transmission

Spatial resolution

Scanning microscope with focusing by means of Fresnel zone plates; resolution determined by spot size, which is 50 nm with current zone plates but will improve with new zone plates

Detectors

Photon-counting detector behind the sample records the intensity of the transmitted radiation, generating an image pixel by pixel during the rastering

Spot size at sample

50 nm with current zone plates

Samples

Format

Thin sections or films (100 nm thick), 3 x 3 mm in area

Preparation

No preparation chamber available

Sample environment

Helium at 1 atm

Special notes

Samples may be wet or dirty; thin films may be deposited on silicon nitride windows; optical alignment is provided by looking at the back side of the sample to locate regions of interest from optical micrographs

Scientific applications

Molecular environmental science STXM

Experimental techniques

Imaging, NEXAFS in small spots

Local contact

Name: Tony Warwick
Phone: (510) 486-5819
Fax: (510) 486-7696
Email: t_warwick@lbl.gov

Spokesperson

Name: David Shuh
Affiliation: Chemical Sciences Division, Berkeley Lab
Phone: (510) 486-6937
Fax: (510) 486-5596
Email: dkshuh@lbl.gov