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Tuesday, 20 October 2009 09:08

 

Photoemission of Highly Correlated Materials; High-Resolution Atomic, Molecular, and Optical Physics

 

Scientific disciplines: AMO, correlated electron systems

 

Endstations:

 

GENERAL BEAMLINE INFORMATION

Operational

Yes

Proposal cycle Proposals for General Sciences Beamlines (6-month cycle)

Source characteristics

10-cm period undulator (U10) (first and third harmonics)

Energy range

17-350 eV

Monochromator

SGM (gratings: 380, 925, 2100 lines/mm)

Calculated and measured flux (1.9 GeV, 400 mA)

Up to 1013 photons/s/0.01% BW at 30 eV

Resolving power (E/ΔE)

>35,000 obtained, slit-width selectable

Scientific disciplines AMO, correlated electron systems

Endstations

High energy resolution spectrometer (HERS)
High-resolution atomic and molecular electron spectrometer (HiRAMES)
HRAMO-Ion-photon beamline (IPB)
Velocity map imaging spectrometer
Electron spin polarization (ESP)

Local Contacts

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Advanced Light Source, Berkeley Lab
Phone: (510) 486-6235
Fax: (510) 486-2067

 

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Advanced Light Source, Berkeley Lab
Phone: (510) 486-4640
Fax: (510) 486-7588

Spokespersons

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University of Nevada, Reno
Phone: (775) 784-6816
Fax: (775) 784-1398

 

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Western Michigan University
Phone: (616) 387-4955
Fax: (616) 387-4939

Beamline phone numbers

(510) 495-2102 (HiRAMES and IPB)
(510) 495-2101 (HERS)

 

ENDSTATION INFORMATION

Endstation name

High energy resolution spectrometer (HERS): Angle resolved photoemission

Characteristics

Designed for very high resolution and angle-resolved photoemission spectroscopy at cryogenic temperatures. The electron energy analyzer rotates 120° about the incoming beam.

Angular resolution

±0.2°

Detectors

Scienta SES R4000 hemispherical electron energy analyzer with angular mode
LEED

Spot size at sample

150 (h) x <100 (v) µm depending on exit slit setting

Samples

Strongly correlated materials

Sample format

Solid state crystals

Sample preparation

Sample manipulator with six degrees of freedom and a temperature range of 18-400 K. Deposition, sputtering, and annealing.

Sample environment UHV <4.0 x 10-11

Scientific applications

Studies of highly correlated electron systems using angle-resolved photoemission of solids

Experimental techniques

Angle-resolved photoemission from solids

Local contact

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Advanced Light Source, Berkeley Lab
Phone: (510) 495-2903
Fax: (510) 495-2067

Spokesperson

Zhi Xun Shen
Stanford University
Phone: (650) 725-8254
Fax: (650) 725-5457

 

ENDSTATION INFORMATION

Endstation name

HRAMO Ion-photon beamline (IPB)

Characteristics

A mass/charge-selected ion beam from a small accelerator is merged with a counter-propagating photon beam over a common path of tens of centimeters. A downstream analyzing magnet and electrostatic deflector disperse the ion beam according to charge/mass ratio.

Detectors

Single channel electron multiplier

Spot size at sample

~ 1500 µm x 1500 µm, < 1 mrad divergence

Samples

Beams of singly and multiply charged positive ions and of negative ions (atomic and molecular) at keV energies produced by an electron cyclotron resonance (ECR) or a sputter ion source

Sample environment

Directed ion-beam target with typical density of 105 cm-3 under ultrahigh vacuum conditions

Scientific applications

Photoionization of atomic and molecular ions: absolute cross-section and photoion-yield spectrum measurements. Photofragmentation of molecular ions.

Spokespersons

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University of Nevada, Reno
Phone: (775) 784-6816
Fax: (775) 784-1398

 

This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Western Michigan University
Phone: (616) 387-4955
Fax: (616) 387-4939

 

ENDSTATION INFORMATION

Endstation name

High-resolution atomic and molecular electron spectrometer (HiRAMES)

Characteristics

The electron spectrometer uses a gas cell on the beam axis to form the interaction region between the sample and the photon beam. The analyzer rotates from 0° to 90° relative to the photon beam, permitting angle-resolved measurements.

Detectors

SCIENTA 4000. Multichannel plate/phosphor CCD combination.

Spot size at sample

< 600 um horizontally focused

Samples

Gas cell, oven, supersonic gas jet. 1-2 m in diameter.

Sample environment

UHV <3.0 x 10-11 Torr

Special notes

Vented gas cabinets are available for hazardous samples

Experimental techniques

High-resolution atomic and molecular photo-electron spectroscopy of gaseous samples

Spokesperson

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Western Michigan University
Phone: (616) 387-4955
Fax: (616) 387-4939

 

ENDSTATION INFORMATION

Endstation name

Velocity Map Imaging Spectrometer (VMI)

Characteristics

Simultaneous detection of correlated ions and electrons. The mu metal shielding permits detection of near zero kinetic energy photoelectrons (<5 meV)

Detectors

A position sensitive detector (Hex-anode) facing a multi-channel plate (MCP)

Spot size at sample

150 (h) x 100 (v) µm depending on exit slit setting

Samples

Cluster source, supersonic gas jet, gas needle.

Sample environment

Differential pumping permits gas pressures of up to 10-5 Torr

Scientific applications

Photoelectron angular distributions with 4pi collection efficiency of near zero kinetic energy photoelectrons.
Photoion fragmentation measurements in correlation to the ejected electrons.

Spokesperson

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Western Michigan University
Phone: (616) 387-4955
Fax: (616) 387-4939

 

ENDSTATION INFORMATION

Endstation name

Electron spin polarization (ESP)

Characteristics

Simultaneous spin analysis of all electron lines in the time-of-flight spectrum with a high signal-to-noise ratio

Detectors

Three time-of-flight spectrometers (TOFs) mounted at different angles in a vacuum chamber, two with retarding-field Mott polarimeters

Spot size at sample

1.5 (h) x1.5 (v) mm

Samples

Gas cell, supersonic gas jet

Sample environment

Differential pumping permits gas pressures of up to 10-5 Torr

Scientific applications

Measurements of electron spin polarization in free atoms, molecules, and clusters

Spokesperson

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Western Michigan University
Phone: (616) 387-4955
Fax: (616) 387-4939