M. Vermeulen

Origin of current instabilities in GaAs/AlxGa1−xAs heterostructures: Avalanche ionization in the AlxGa1−xAs layer

E. A. E. Zwaal, P. Hendriks, M. Vermeulen, P. T. J. van Helmond et autres

Pulsed current-voltage measurements on modulation-doped GaAs/AlxGa1−xAs heterostructures are presented at electric fields up to 2 kV/cm. At fields between 0.5 and 2.0 kV/cm we observe up to three well-defined avalanche type current jumps as a function of time. These current jumps show …

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Observation of current filaments in GaAs/AlxGa1−xAs heterostructures using a time-resolved imaging technique

E. A. E. Zwaal, M. Vermeulen, P. Hendriks, J. E. M. Haverkort et autres

We developed a time-resolved optical beam induced current (TROBIC) technique, and performed time-resolved current imaging experiments on GaAs/AlxGa1−xAs heterostructures under high electric field conditions. These experiments are the first time-resolved imaging experiments of current patterns in a two-dimensional semiconductor structure. We attribute …

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Evaluation of electrical conductivity-temperature curves using a mathematical model: temperature-dependent changes during thawing of frozen aqueous pharmaceuticals

J A VAN GORP, P. J. M. Salemink, M. Vermeulen, P Banken

The information contained in the electrical conductivity curves of pharmaceuticals measured as a function of temperature can be represented by a small set of parameters. This is achieved by approximating the electrical conductivity curve as a number of consecutive steps, using a …

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Abstracts of papers

D.M. Barends, H. Lingeman, W. van der Doelen, W. M. J. Beek et autres

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Spectroscopic Properties of β‐Phenethyl‐Tin Compounds

Marcel Gielen, M. Vermeulen

Abstract The 60 MHz NMR and 70 eV mass spectra of thirteen β‐phenethyltin compounds are described and discussed.

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Rotational vs vibrational relaxation in the ν(CO) bands of metal carbonyls

M. Vermeulen, G. Michel, J. Nasielski

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Analyse des profils infrarouges et Raman des vibrations nu(CO) de complexes carbonyles de métaux de transition

M. Vermeulen, Richard Martin

Doctorat en Sciences

The origin of some irreproducibilities in the kinetic study of the reaction W(CO)5 (aniline) + P(C6H5)3

J. Nasielski, M. Vermeulen, P. Leempoel

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