Conventional transmission electron

Transmission Electron Microscopy Transmission Electron Microscope Conventional Transmission Electron Microscopy Scannir Transmission Electron Microscopy High Resolution Transmission Electron Microscopy Selected Area Diffraction Analytical Elearon Microscopy Convergent Beam Elearon DifFraaion Lorentz Transmission Electron Microscopy... [Pg.769]

Analysis of individual catalyst particles less than IMm in size requires an analytical tool that focuses electrons to a small probe on the specimen. Analytical electron microscopy is usually performed with either a dedicated scanning transmission electron microscope (STEM) or a conventional transmission electron microscope (TEM) with a STEM attachment. These instruments produce 1 to 50nm diameter electron probes that can be scanned across a thin specimen to form an image or stopped on an image feature to perform an analysis. In most cases, an electron beam current of about 1 nanoampere is required to produce an analytical signal in a reasonable time. [Pg.362]

But darkfield conventional transmission electron microscopy can now reveal monatomic steps directly, as the micrograph in Fig. 12 shows (71). Using this kind of approach it should be possible to ascertain quantitatively the extent of the interaction between a catalyst and its underlying support. [Pg.450]

The transmission electron microscope is now well established as a useful tool for the characterization of supported heterogeneous catalysts(l). Axial bright-field imaging in the conventional transmission electron microscope (CTEM) is routinely used to provide the catalyst chemist with details concerning particle size distributions, 3), particle disposition over the support material(2-6) as well as particle morphology(7). Internal crystal structure(8-10), and elemental compositions(ll) may be inferred by direct structure imaging. [Pg.360]

A spectrometer for the measurement of characteristic secondary X-rays was perhaps the first peripheral analytical device to be attached to a conventional Transmission Electron Microscope (TEM)... [Pg.37]

Selective chemical staining of the rubber phase of the samples using chlorosulphonic acid and osmium tetroxide, preparation of ultrathin sections (about 0.1 xm thick) in a cryoultramicro-tome, and investigation of the sections by conventional transmission electron microscopy (TEM). [Pg.262]

There are currently two variants of STEM, depending on whether it is specifically designed for scanning microscopy operation or adopted from conventional transmission electron microscopy work. Figure 3.1 shows a... [Pg.39]

Wash-coat separated from the cordierite monolith by scraping was examined directly by two electron microscopy techniques CTEM (Conventional Transmission Electron Microscopy) and STEM (Scanning Transmission Electron Microscopy). [Pg.815]

A conventional transmission electron microscope is required as well as an electron energy analyser to measure the electron energy loss spectra. It is often preferable to keep the energy of the detected electrons constant and to sweep the energy of incident electrons instead to improve signal to noise and energy resolution. [Pg.530]