skip to main content

Title: A simple electron time-of-flight spectrometer for ultrafast vacuum ultraviolet photoelectron spectroscopy of liquid solutions

We present a simple electron time of flight spectrometer for time resolved photoelectron spectroscopy of liquid samples using a vacuum ultraviolet (VUV) source produced by high-harmonic generation. The field free spectrometer coupled with the time-preserving monochromator for the VUV at the Artemis facility of the Rutherford Appleton Laboratory achieves an energy resolution of 0.65 eV at 40 eV with a sub 100 fs temporal resolution. A key feature of the design is a differentially pumped drift tube allowing a microliquid jet to be aligned and started at ambient atmosphere while preserving a pressure of 10⁻¹ mbar at the micro channel plate detector. The pumping requirements for photoelectron (PE) spectroscopy in vacuum are presented, while the instrument performance is demonstrated with PE spectra of salt solutions in water. The capability of the instrument for time resolved measurements is demonstrated by observing the ultrafast (50 fs) vibrational excitation of water leading to temporary proton transfer.
Authors:
; ; ;  [1] ; ; ;  [2] ; ; ; ; ; ; ;  [3] ; ; ; ; ;  [4]
  1. Laboratory of Ultrafast Spectroscopy, ISIC, Station 6, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne (Switzerland)
  2. Physics Department, ETH Zurich, 8093 Zurich (Switzerland)
  3. Department of Physics, The Blackett Laboratory, Imperial College, London SW7 2AZ (United Kingdom)
  4. Central Laser Facility, STFC Rutherford Appleton Laboratory, Oxon OX11 0QX (United Kingdom)
Publication Date:
OSTI Identifier:
22305880
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; AQUEOUS SOLUTIONS; DRIFT TUBES; ELECTRONS; ENERGY RESOLUTION; EXCITATION; FAR ULTRAVIOLET RADIATION; HARMONIC GENERATION; MICROCHANNEL ELECTRON MULTIPLIERS; PERFORMANCE; PHOTOELECTRON SPECTROSCOPY; PROTONS; TIME RESOLUTION; TIME-OF-FLIGHT SPECTROMETERS