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Beamline 10.0.1

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

Operational	Now
Source characteristics	10-cm-period undulator (U10) (first and third harmonics)
Energy range	17-340 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 (photon energy and resolution dependent)
Resolving power (E/ΔE)	>10,000 obtained, slit-width selectable
Endstations	High energy resolution spectrometer (HERS) High-resolution atomic and molecular electron spectrometer (HiRAMES) Ion-photon beamline (IPB) Electron spin polarization (ESP)
Beamline phone numbers	(510) 495-2100 (HiRAMES) (510) 495-2101 (HERS) (510) 495-2102 (IBP)

Endstation	High energy resolution spectrometer (HERS)
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	±0.25°
Detectors	Scienta 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
Format	UHV-compatible solids
Preparation	Sample manipulator with six degrees of freedom and a temperature range of 18-400 K, standard surface-science preparation and characterization equipment
Scientific applications	Studies of highly correlated electron systems using angle-resolved photoemission of solids
Experimental techniques	Angle-resolved photoemission from solids
Local contact	Name: Wanli Yang Phone: (510) 486-4989 Fax: (510) 486-4299 Email: xjzhou@lbl.gov
Spokesperson	Name: Prof. Zhi Xun Shen Affiliation: Stanford University Phone: (650) 725-8254 Fax: (650) 725-5457

Endstation	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 SES-200 2electron energy analyzer
Spot size at sample	0.4 (h) x 0.1-0.5 (v) mm depending on exit slit setting
Samples	Gas cell, oven, supersonic gas jet
Sample environment	Windowless differential pumping permits gas pressures of up to 10^-5 Torr
Special notes	Vented gas cabinets are available for hazardous samples
Experimental techniques	High-resolution atomic and molecular electron spectroscopy
Local contacts	Name: David Kilcoyne Phone: (510) 486-4640 Fax: (510) 486-7588	Name: Alex Aguilar Phone: (510) 486-6235 Fax: (510) 486-2067
Spokesperson	Name: Nora Berrah Affiliation: Western Michigan University Phone: (616) 387-4955 Fax: (616) 387-4939

Endstation	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	Microchannel-plate product-ion detector. Calibrated silicon photodiode detector for photon beam.
Spot size at sample	1.5 (h) x 1.5 (v) mm over 29.4-cm path where photon and ion beams are merged and their spatial overlap is measured.
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.
Local contacts	Name: David Kilcoyne Phone: (510) 486-4640 Fax: (510) 486-7588	Name: Alex Aguilar Phone: (510) 486-6235 Fax: (510) 486-2067
Spokespersons	Name: Ronald Phaneuf Affiliation: University of Nevada, Reno Phone: (775) 784-6816 Fax: (775) 784-1398	Name: Nora Berrah Affiliation: Western Michigan University Phone: (616) 387-4955 Fax: (616) 387-4939

Endstation	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
Local contacts	Name: David Kilcoyne Phone: (510) 486-4640 Fax: (510) 486-7588	Name: Alex Aguilar Phone: (510) 486-6235 Fax: (510) 486-2067
Spokesperson	Name: Nora Berrah Affiliation: Western Michigan University Phone: (616) 387-4955 Fax: (616) 387-4939

Five datasheets about this beamline are available as PDF files:
High-Resolution Spectroscopy of Correlelated Electron Systems
High Energy Resolution Spectrometer (HERS)
High-Resolution Atomic and Molecular Electron Spectrometer (HiRAMES)
Ion Photon Beamline (IPB)
Electron Spin Polarization (ESP)

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