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A monovacancy defect is observed by positron-lifetime and Doppler-broadening experiments in semiinsulating GaAs after photoquenching the ELI defects. The monovacancy exhibits the same thermal and optical recoveries as the metastable state of EL2 and its concentration is proportional to that of the ELI defect. It is concluded that the metastable state of the ELI defect involves the monovacancy. The results indicate that the monovacancy or its immediate surroundings is negatively charged.

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The feasibility and first results of a near sensor digitalization of fluxgate signals (digital fluxgate magnetometer) are presented. Applying the usual magnetometer electronics we have substituted the analogue section by a digital processing unit (ow). The 2f , signal is digitized at its second harmonic and mean values are online phase-sensitively calculated. Based on this development we present a completely redesigned magnetometer experiment for applications on planetary surfaces. Sensor and electronics including serial interface have to be in one housing, its weight is less than 150 g and the number of electrical connections is limited to four (power lines + serial link). Applications for the digital magnetometer on Earth are also discussed.

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