Download Advances in optical and electron microscopy by Tom Mulvey, Charles J.R. Sheppard PDF

By Tom Mulvey, Charles J.R. Sheppard

The volumes during this sequence hide the development and innovation in optical and electron microscopy at a basic point. it's geared toward microscopists and researchers not just drawn to microscope instrumentation but additionally in functions starting from organic options to fabrics learn and commercial inspection

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H. LICHTE 26 analysis. However, these "inelastic" electrons are not suitable for imaging the object structure with atomic resolution; this can only be achieved by means of electrons scattered at the atom nuclei without transfer of energy where, in general, the electron wave leaving the object is modulated in both amplitude, a(r), and phase, 0(r), corresponding to the object structure. For the determination of the object structure, the object wave, which can be represented as o(r) = a(r)exp(i(/>(r)), is imaged into an image wave at a high magnification.

135 x 10" 1 5 eV results in a beat of 1 Hz. As the amount of inelastic energy transfer ranges from about zero to several tens of electron volts there is a corresponding variety of beat frequencies averaging the contributions of inelastic electrons in the constant background of the hologram. 5 if both object and reference wave are transmitted through such a foil. Therefore the object should be prepared, if possible, without a supporting foil. In principle, there are fewer problems with objects of high atomic number Z because the ratio between the desirable elastic and the undesirable inelastic cross section is given approximately by Z/20 (Lenz, 1970); in the case of carbon (Z = 6) the inelastic interaction predominates while for uranium (Z = 92) the elastic interaction predominates.

Anisotropie aberrations are not considered in this paper. A simple example may illustrate the way a wave is altered due to the aberrations. Assume a plane wave illuminates a pure weak cosinusoidal phase grating parallel to the optical axis; just below the object the object wave takes the form o(r) = exp(i(/>0 c o s ^ R r ) ) ; φ0 « In = 1 +i 0 cos^Rr).

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