Monochromated ELS. History, context and opportunities
- Arizona State Univ., Tempe, AZ (United States)
Although field-emitters may be the brightest continuous laboratory source available, coulomb repulsion between electrons at crossovers increases their energy spread [1]. ELS is barely competitive with synchrotrons for inner shell absorption spectroscopy, and not at all competitive with infrared optical spectroscopy (except as regards spatial resolution). Monochromators designed to address this have a long history for both high [2] and low-energy electrons [3]. The recent availability of commercial monchromators for STEM raises questions of their uses in materials science, which we review, together with comments on the relationship of ELS to other techniques. Some highlights of ELS achievements include ELS of vibrational modes in amorphous silicon at 3 meV energy resolution (30kV beam in transmission, 10 micron area) [4], ELS from Oxygen K edge in oxide superconductors at 80meV (1mm area) [5], inner-shell spectra from a single La dopant atom in an oxide at better than 0.2nm spatial resolution in STEM [6], and a double Wein-filter TEM operating at 60kV with energy resolution in the range 12 - 200 meV and corresponding spatial resolution of 110 - 30 nm [7]. Figure 1 shows the diamond exciton resolved with this instrument, and high-resolution ELS from individual carbon nanotubes
- Research Organization:
- Arizona State Univ., Tempe, AZ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- FG03-02ER45996
- OSTI ID:
- 1158813
- Report Number(s):
- DOE-ASU-45996
- Journal Information:
- Microscopy and Microanalysis (Online), Vol. 10, Issue S03; ISSN 1435-8115
- Publisher:
- Microscopy Society of America
- Country of Publication:
- United States
- Language:
- English
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