Improved metastable de-excitation spectrometer using laser-cooling techniques

A Pratt, A Roskoss, H Menard, M Jacka

Research output: Contribution to journalArticlepeer-review

Abstract

Details of a new approach for performing metastable de-excitation spectroscopy are given. A beam of metastable (2 S-3) helium atoms, produced in a hollow cathode dc discharge, is collimated and subsequently focused using Doppler cooling of the 2 S-3(1)-2 P-3(2) transition at 1083 nm, forming an intense probe of up to 1x10(12) atoms s(-1) cm(-2). The large distance (2.5 m) between source and sample means that the beam is relatively free of UV photons and 2 S-1 metastable atoms, removing the need for quench lamps and chopper wheels. As well as providing a clean high intensity source, the well defined nature of the beam is a necessary step towards using more sophisticated laser-cooling techniques with the ultimate aim of producing a metastable helium microscope. MDS and UPS spectra from Si(111) are shown. © 2005 American Institute of Physics.

Original languageEnglish
Article number053102
Pages (from-to)-
Number of pages6
JournalReview of Scientific Instruments
Volume76
Issue number5
DOIs
Publication statusPublished - May 2005

Keywords

  • ATOM ELECTRON-SPECTROSCOPY
  • SOLID-SURFACES
  • HELIUM-ATOMS
  • BEAM SOURCE
  • HIGH-FLUX
  • DISCHARGE
  • LIQUID
  • STATES
  • PROBE

Cite this