Showing papers by "Fraunhofer Society published in 1976"
TL;DR: In this paper, it was shown that impurities and defects in semiconductors are associated with energy levels in the forbidden gap, and it is well known that impurity and defect in a semiconductor can be associated with the energy levels of surface states.
Abstract: It is well known that impurities and defects in semiconductors are associated with energy levels in the forbidden gap. Similar states occur at the surface of a semiconductor where the crystal lattice and the symmetry are strongly disturbed. These states are called surface states. Owing to the two-dimensional nature of the surface, their density is measured per unit area, in contrast to bulk states, which are measured per unit volume. A third type of states, similar to surface states, occurs at the interface between two adjacent materials. These states are called interface states. Very often they are also simply called surface states.
164 citations
TL;DR: In this article, a condensation monodisperse aerosol generator has been adapted to the production of radioactively labeled particles by using radioactive condensation nuclei, and the inactive solution used for the nuclei generation has been replaced with a low carrier radioactive solution.
27 citations
12 citations
7 citations
TL;DR: In this article, the authors investigated the causal sequence of stratospheric air injections triggered by solar events and found that the frequency of injections increases significantly after H α -flares near the central meridian of the Sun.
5 citations
TL;DR: In this article, an ammonium paramolybdate (NH4)6 Mo7O24·4H2O→7 MoO3 + 6NH3 + 7H2 O was used for the production of radioactive condensation nuclei.
4 citations