|
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
|
This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Advanced Light Source, Berkeley Lab
Phone: (510) 486-6235
Fax: (510) 486-2067
This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Advanced Light Source, Berkeley Lab
Phone: (510) 486-4640
Fax: (510) 486-7588
|
Spokespersons
|
This e-mail address is being protected from spambots. You need JavaScript enabled to view it
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
|
|
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
|
This e-mail address is being protected from spambots. You need JavaScript enabled to view it
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
|
This e-mail address is being protected from spambots. You need JavaScript enabled to view it
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
|
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
|
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
|
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
|
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
|
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
|
|
