The operation of improved thermally stimulated current (TSC) spectroscopy is described and analysed. This method is suited for studying defects in semi-insulating (SI) GaAs at liquid-helium temperatures. This paper, the first in a series, presents an analysis of the first half process of TSC, that is, initialization, which consists of three stages: carrier generation, transport, and trapping. The initialization is analysed in terms of such parameters as electrode spacing, biasing voltage and polarity, excitation light energy and dose, and temperature. The analysis leads to new methods of determining the cross section of a deep level trap. From the photocurrent transient, the cross section was estimated for the dominant trap(s) as 5×10-15 cm2. Another method offers an estimation for nondominant trap levels.
A 60-year-old housewife was affected with adult T-cell leukemia (ATL) 10 years after her husband died of T-cell lymphoma, which was retrospectively diagnosed as ATL. She had never had a blood transfusion nor any indication of infection by human T-cell lymphotropic virus type I (HTLV-I) from her parents. The report suggested the wife to have developed ATL by horizontal transmission of HTLV-I from her husband 31 years after their marriage.
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