Laser-induced Formation of Conductive Structures on Diamond-like Carbon Films

Modification of diamond-like carbon (DLC) films by laser radiation with a wavelength of 532 nm and pulse duration of 18 ns was investigated. The treatment of DLC films with laser fluence over 0.4 J/cm2 was accompanied by the formation of conductive structures with a surface resistance from a few to hundreds kΩ/sq. Dependence of films conductivity from the laser fluence was established. Relationship between energy density of laser radiation and the structural changes in the films, its heating and evaporation is discussed

Laser-induced Formation of Conductive Structures on Diamond-like Carbon Films

Modification of diamond-like carbon (DLC) films by laser radiation with a wavelength of 532 nm and pulse duration of 18 ns was investigated. The treatment of DLC films with laser fluence over 0.4 J/cm2 was accompanied by the formation of conductive structures with a surface resistance from a few to hundreds kΩ/sq. Dependence of films conductivity from the laser fluence was established. Relationship between energy density of laser radiation and the structural changes in the films, its heating and evaporation is discussed

Interlaboratory Fission Track Dating Of Volcanic Ash Levels From Eastern Paratethys. A Mediterranean-paratethys Correlation

The age of glass shard levels, interlayered in Sarmatian deposits from the southwestern Russia are measured with the fission track method. The results obtained from different laboratories (Moscow, Pisa, Campinas) using their specific techniques are in good agreement so proving a good interlaboratory agreement. The results suggest a new correlation between Paratethys and the Mediterranean area, in better agreement with the global climatic trend of this period. According to the proposed scheme the Chersonian/Maeotian boundary (9-9.5 Ma) is correlatable with the Vallesian/Turolian boundary (continental Mediterranean stratigraphy) and with the Middle Tortonian (marine Mediterranean stratigraphy); the Bessarabian (time span between 12.5 and 11 Ma) is correlatable with the Lower Vallesian and with the Upper Serravallian; the beginning of the Volhynian, that is the beginning of the Sarmatian (14-13.5 Ma), is correlatable with the Upper Astaracian and with the lower boundary of the Serravallian. Due to the large experimental errors of the ages and possible systematic errors the proposed stratigraphic sequence may be regarded as a working hypothesis to be confirmed by further data. © 1992.953-4287295Alberdi, A review of Old World hipparionine horses (1989) The Evolution of Perissodactyls, pp. 235-261. , D.R. Prothero, R.M. SchochAlberdi, Bonadonna, Climatic changes and presence of Hipparion in the Mediterranean area (1990) Paleobiol. 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