Improved metastable de-excitation spectrometer using laser-cooling techniques

Andrew Pratt, Alexander Roskoss, Herv́ Ḿnard, Marcus Jacka

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Details of a new approach for performing metastable de-excitation spectroscopy are given. A beam of metastable (2 S3) helium atoms, produced in a hollow cathode dc discharge, is collimated and subsequently focused using Doppler cooling of the 2 S13 -2 P23 transition at 1083 nm, forming an intense probe of up to 1× 1012 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 S1 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.

Original languageEnglish
Article number053102
JournalReview of Scientific Instruments
Volume76
Issue number5
Early online dateApr 2005
DOIs
Publication statusPublished - May 2005

Keywords

  • Atomic and molecular beams
  • Statistical methods
  • Surface states
  • Atomic and molecular beam sources
  • Mirrors

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