title: Tunable vacuum ultraviolet laser based spectrometer for angle resolved photoemission spectroscopy.
abstract: We have developed an angle-resolved photoemission spectrometer with tunable vacuum ultraviolet laser as a photon source. The photon source is based on the fourth harmonic generation of a near IR beam from a Ti:sapphire laser pumped by a CW green laser and tunable between 5.3 eV and 7 eV. The most important part of the set-up is a compact, vacuum enclosed fourth harmonic generator based on potassium beryllium fluoroborate crystals, grown hydrothermally in the US. This source can deliver a photon flux of over 10(14) photon/s. We demonstrate that this energy range is sufficient to measure the k(z) dispersion in an iron arsenic high temperature superconductor, which was previously only possible at synchrotron facilities.
authors.affiliation: Division of Materials Science and Engineering, Ames Laboratory, Ames, Iowa 50011, USA.
authors.forename: Rui
authors.initials: R
authors.lastname: Jiang
authors.affiliation: Division of Materials Science and Engineering, Ames Laboratory, Ames, Iowa 50011, USA.
authors.forename: Daixiang
authors.initials: D
authors.lastname: Mou
authors.affiliation: Division of Materials Science and Engineering, Ames Laboratory, Ames, Iowa 50011, USA.
authors.forename: Yun
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Division of Materials Science and Engineering, Ames Laboratory, Ames, Iowa 50011, USA.
authors.forename: Lunan
authors.initials: L
authors.lastname: Huang
authors.affiliation: Department of Chemistry, Clemson University, Clemson, South Carolina 29634, USA.
authors.forename: Colin D
authors.initials: CD
authors.lastname: McMillen
authors.affiliation: Department of Chemistry, Clemson University, Clemson, South Carolina 29634, USA.
authors.forename: Joseph
authors.initials: J
authors.lastname: Kolis
authors.affiliation: Advanced Photonic Crystals LLC, Fort Mill, South Carolina 29708, USA.
authors.forename: Henry G
authors.initials: HG
authors.lastname: Giesber
authors.affiliation: Advanced Photonic Crystals LLC, Fort Mill, South Carolina 29708, USA.
authors.forename: John J
authors.initials: JJ
authors.lastname: Egan
authors.affiliation: Division of Materials Science and Engineering, Ames Laboratory, Ames, Iowa 50011, USA.
authors.forename: Adam
authors.initials: A
authors.lastname: Kaminski