ISEELS - Inner Shell
Electron Energy Loss Spectroscopy - dipole-regime core excitation spectra
of gas phase molecules. Recent themes: models for polymer and biological
systems: amino acids & peptides; sugars & peptidoglycans; carbonyl
compounds, peroxides, bi-ring systems.
Review article: A.P.
Hitchcock, Inner shell Excitation Spectroscopy of Molecules using Inelastic
Electron Scattering, J. Electron Spectroscopy Rel. Phenom. 112 (2000)
McVAHRES - McMaster Variable
Angle High Resolution Electron Spectrometer - non-dipole and spin-forbidden
core excitation transitions in gas molecules. Quantitative generalized
oscillator strengths (GOS). Quasi-elastic scattering - a fascinating
exploration of Rutherford scattering by individual atoms in molecules
that has intriguing details that may give insights into quantum superposition
and decoherence - phenomena at the heart of quantum computing.
Review article: A.P. Hitchcock,
I.G. Eustatiu, J.T. Francis and C.C. Turci, Electron Impact Core excitation
of molecules: Non-dipole spectroscopy and generalised oscillator strengths,
J. Electron Spectrosc. 88-91 (1998) 77-82.
McEELFS: McMaster Electron Energy Loss Fine Structure Spectrometer
- is a UHV surface analysis system designed to explore reflection core
loss spectroscopy of well-defined surfaces and adsorbates. It features
a fixed hemispherical analyser (HSA) with flexible electron optics,
used to analyse inelastic scattering of electrons from surfaces. It
has two electron guns - a fixed field emission gun at 90 deg. from the
analyser, and a moveable oxide cathode electron gun with independent
motion of elecron gun position and sample orientation.
Refelction EELS at McMaster: A.P.
Hitchcock and T. Tyliszczak, Surface studies by core-excitation reflection
electron energy loss spectroscopy, Surface Review and Letters 2 (1995)
Status as of 2021. ISEELS is functional and used intermittently
several months a year. McVAHRES is intact, and was functional whe last
used in ~2010. McEELFS has been partly disassembled and cannibalized.
It would be a major project to resuscitate.