René Vogel

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Scanning tunneling microscopy (STM) and high-resolution transmission electron microscopy (TEM) have been used to determine the dimensions of a series of palladium clusters stabilized by tetraalkylammonium salts. Electrochemically prepared colloids were used in which the average diameter of the inner metal core was varied between 2 and 4 nanometers, and the(More)
Organic peroxides such as the cumene hydroperoxide I (M(r) = 152 u), the di-tert-butyl peroxide II (M(r) = 146 u) and the tert-butyl peroxybenzoate III (M(r) = 194 u) were analyzed by atmospheric pressure chemical ionization mass spectrometry using a water-methanol mixture as solvent with a low flow-rate of mobile phase and unusual conditions of the source(More)
Most existing electron sources extract electrons from conductors. Since the actual temperature inside the conductor is much less than the Fermi temperature of the conduction electrons, the electron degeneracy &#948;<inf>f</inf>is close to 1, the maximum allowed by the Pauli exclusion principle. However, during extraction several factors conspire together to(More)
A simple method has been proposed to measure the resistive parameters of MESFET's. An equivalent circuit of the forward biased FET valid in a low frequency limit which allows to determine the gate, source and drain parasitic resistances from the measured parameters was developed. The ideality factor of the gate diode and the channel resistance can also be(More)
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