Share This Author
Vibrational spectroscopy in the electron microscope
It is demonstrated that the vibrational signal has both high- and low-spatial-resolution components, that the first component can be used to map vibrational features at nanometre-level resolution, and that the second component can been used for analysis carried out with the beam positioned just outside the sample—that is, for ‘aloof’ spectroscopy that largely avoids radiation damage.
Damage-free vibrational spectroscopy of biological materials in the electron microscope
The potential of aloof spectroscopy is demonstrated, which opens up the possibility of non-damaging compositional analyses of organic functional groups, including non-crystalline biological materials, at a spatial resolution of ∼10 nm, simultaneously combined with imaging in the electron microscope.
Monochromated STEM with a 30 meV-wide, atom-sized electron probe.
Tests of the monochromator indicate that the instrument can perform imaging and EELS with an atom-sized probe <30 meV wide in energy, and that an improvement in energy resolution to 10 meV and beyond should be possible in the future.
Progress in ultrahigh energy resolution EELS.
Hybrid pixel direct detector for electron energy loss spectroscopy.
Advances in Ultra-High Energy Resolution STEM-EELS
- T. Lovejoy, G. Corbin, N. Dellby, M. Hoffman, O. Krivanek
- PhysicsMicroscopy and Microanalysis
- 1 August 2018
The Ultra-High Energy Resolution Monochromated EELS-STEM (U-HERMES ™ ) system developed by Nion combines a dispersing-undispersing ground-potential monochromator , a bright cold-field-emission…
Band bending and surface defects in β-Ga2O3
Surface band bending and surface defects on the UV-transparent conducting oxide β-Ga2O3 (100) are studied with hard x-ray photoemission spectroscopy and scanning tunneling microscopy. Highly doped…
Identification of site-specific isotopic labels by vibrational spectroscopy in the electron microscope
The vibrational spectra of an α amino acid, l-alanine, are recorded with damage-free “aloof” electron energy-loss spectroscopy in a scanning transmission electron microscope to directly resolve carbon-site–specific isotopic labels in real space with nanoscale spatial resolution.
Electron-Beam Mapping of Vibrational Modes with Nanometer Spatial Resolution.
- C. Dwyer, T. Aoki, P. Rez, S. Y. Chang, T. Lovejoy, O. Krivanek
- PhysicsPhysical review letters
- 15 December 2016
It is demonstrated that a focused beam of high-energy electrons can be used to map the vibrational modes of a material with a spatial resolution of the order of one nanometer, which should reconcile current controversy regarding the spatial resolution achievable in vibrational mapping with focused electron beams.
Surface morphology and electronic structure of bulk single crystal β-Ga2O3(100)
Experimental studies of the surface morphology and electronic structure of bulk single crystals of the transparent and wide gap semiconductor gallium oxide (β-Ga2O3) have been conducted using…