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Title: Performance of a Micro-Spot High-Resolution Photoemission Beamline at PAL

Abstract

We present the commissioning results of a micro-spot high-resolution VUV and soft x-ray photoemission beamline with a spherical grating monochromator at PAL. A negative-order NOGARD-type monochromator shows a good energy resolution enough for high-resolution angle-resolved photoemission spectroscopy, which is demonstrated by experimental photoabsorption spectra of various gases. The beam-spot size at a sample position is estimated to be smaller than 10 x 10 {mu}m2 (FWHM)

Authors:
; ; ;  [1]; ; ; ;  [2]
  1. Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of)
  2. School of Physics and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-742 (Korea, Republic of)
Publication Date:
OSTI Identifier:
21052558
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 879; Journal Issue: 1; Conference: 9. international conference on synchrotron radiation instrumentation, Daegu (Korea, Republic of), 28 May - 2 Jun 2006; Other Information: DOI: 10.1063/1.2436102; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ABSORPTION SPECTRA; BEAM PRODUCTION; COMMISSIONING; EMISSION SPECTROSCOPY; ENERGY RESOLUTION; FAR ULTRAVIOLET RADIATION; MONOCHROMATORS; PERFORMANCE; PHOTOEMISSION; PHOTON BEAMS; POHANG LIGHT SOURCE; SOFT X RADIATION; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Kim, Hyeong-Do, Kim, J.-Y., Kim, Jin Hong, Kang, Tai-Hee, Min, Chul-Hee, Kim, Bum Joon, Cho, Deok-Yong, and Oh, S.-J.. Performance of a Micro-Spot High-Resolution Photoemission Beamline at PAL. United States: N. p., 2007. Web. doi:10.1063/1.2436102.
Kim, Hyeong-Do, Kim, J.-Y., Kim, Jin Hong, Kang, Tai-Hee, Min, Chul-Hee, Kim, Bum Joon, Cho, Deok-Yong, & Oh, S.-J.. Performance of a Micro-Spot High-Resolution Photoemission Beamline at PAL. United States. doi:10.1063/1.2436102.
Kim, Hyeong-Do, Kim, J.-Y., Kim, Jin Hong, Kang, Tai-Hee, Min, Chul-Hee, Kim, Bum Joon, Cho, Deok-Yong, and Oh, S.-J.. Fri . "Performance of a Micro-Spot High-Resolution Photoemission Beamline at PAL". United States. doi:10.1063/1.2436102.
@article{osti_21052558,
title = {Performance of a Micro-Spot High-Resolution Photoemission Beamline at PAL},
author = {Kim, Hyeong-Do and Kim, J.-Y. and Kim, Jin Hong and Kang, Tai-Hee and Min, Chul-Hee and Kim, Bum Joon and Cho, Deok-Yong and Oh, S.-J.},
abstractNote = {We present the commissioning results of a micro-spot high-resolution VUV and soft x-ray photoemission beamline with a spherical grating monochromator at PAL. A negative-order NOGARD-type monochromator shows a good energy resolution enough for high-resolution angle-resolved photoemission spectroscopy, which is demonstrated by experimental photoabsorption spectra of various gases. The beam-spot size at a sample position is estimated to be smaller than 10 x 10 {mu}m2 (FWHM)},
doi = {10.1063/1.2436102},
journal = {AIP Conference Proceedings},
number = 1,
volume = 879,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2007},
month = {Fri Jan 19 00:00:00 EST 2007}
}
  • The performance of ALS beamline 7.0 is described. This is an integrated system for delivering radiation from a 5 cm period undulator to spectroscopy and microscopy experiments across the range of photon energies from 60 to 1200 eV. The beamline is engineered to deliver the highest possible flux, with negligible deformation of the optic surfaces due to heating. Two experiment stations are served with rapid interchangeability. The measured operational parameters, the resolution and flux delivered, and the refocus of the light into a small spot at the experiment are all discussed.
  • At the Advanced Light Source an undulator beamline, with an energy range from 6 to 30 eV, has been constructed for chemical dynamics experiments. The higher harmonics of the undulator are suppressed by a novel, windowless gas filter. In one branchline high-flux, 2{percent} bandwidth radiation is directed toward an end station for photodissociation and crossed molecular-beam experiments. A photon flux of 10{sup 16}photon/s has been measured at this end station. In a second branchline a 6.65 m off-plane Eagle monochromator delivers narrow bandwidth radiation to an end station for photoionoization studies. At this second end station a peak flux ofmore » 3{times}10{sup 11} was observed for 25000 resolving power. This monochromator has achieved a resolving power of 70000 using a 4800 grooves/mm grating, one of the highest resolving powers obtained by a vacuum ultraviolet monochromator. {copyright} {ital 1997 American Institute of Physics.}« less
  • No abstract prepared.
  • Bending magnet beamline 9.3.2 at the Advanced Light Source (ALS) was designed for high resolution spectroscopy with the capability for delivering circularly polarized light in the soft x-ray energy region using three gratings. The monochromator is a fixed included-angle spherical grating monochromator (SGM) and was originally used at SSRL as a prototype for later insertion-device-based monochromators for the ALS. For operation at the ALS, the toroidal pre-mirror used at SSRL was replaced by a horizontally focusing and a vertically focusing mirror in the Kirkpatrick-Baez configuration. Circularly polarized radiation is obtained by inserting a water-cooled movable aperture in front of themore » vertically focusing mirror to allow selecting the beam either above or below the horizontal plane. To maintain a stable beam intensity through the entrance slit, the photocurrent signals from the upper and lower jaws of the entrance slit are utilized to set a feedback loop with the vertically deflecting mirror piezoelectric drive. The beamline end station has a movable platform that accommodates two experimental chambers enabling the synchrotron radiation to be directed to either one of the two experimental chambers without breaking the vacuum. {copyright} {ital 1996 American Institute of Physics.}« less
  • Beamline 9.0.1 at the Advanced Light Source provides an intense photon beam with high spectral resolution and is well suited for a variety of experiments in atomic and molecular physics. The high brightness synchrotron source, 4.5 m long undulator and high quality spherical grating monochromator are all critical to the high performance of the beamline. The accessible photon energy range covers 20 to 300 eV with approximately 10{sup 12} photons per second with a bandwidth of one part in 10,000. The resolution-flux ratio can be varied to meet the demands of the experiment. Very high resolution spectra of the Hemore » double excitation resonances have recently been obtained, for example, using slit widths of < 5 {mu}m. Examples of high resolution photoionization, ion yield and photoelectron spectra measured using beamline 9.0.1 will be presented.« less