Vibrational spectroscopy of H2He+ and D2He+

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Detection of Interstellar Ortho-D2H+ with SOFIA

We report on the detection of the ground-state rotational line of ortho-D2H+ at 1.477 THz (203 mu m) using the German REceiver for Astronomy at Terahertz frequencies (GREAT) on. board the Stratospheric Observatory For Infrared Astronomy (SOFIA). The line is seen in absorption against. far-infrared continuum from the protostellar binary IRAS 16293-2422 in Ophiuchus. The para-D2H+ line at 691.7 GHz was not detected with the APEX telescope toward this position. These D2H+ observations complement our previous detections of para-H2D+ and ortho-H2D+ using SOFIA and APEX. By modeling chemistry and radiative transfer in the dense core surrounding the protostars, we find that the ortho-D2H+ and para-H2D+ absorption features mainly originate in the cool (T <18 K) outer envelope of the core. In contrast, the ortho-H2D+ emission from the core is significantly absorbed by the ambient molecular cloud. Analyses of the combined D2H+ and H2D+ data result in an age estimate of similar to 5. x. 10(5) yr for the core, with an uncertainty of similar to 2. x. 10(5) yr. The core material has probably been pre-processed for another 5. x. 10(5) years in conditions corresponding to those in the ambient molecular cloud. The inferred timescale is more than 10 times the age of the embedded protobinary. The D2H+ and H2D+ ions have large and nearly equal total (ortho+ para) fractional abundances of similar to 10(-9) in the outer envelope. This confirms the central role of H-3 + in the deuterium chemistry in cool, dense gas, and adds support to the prediction of chemistry models that also D-3(+) should be abundant in these conditions.Peer reviewe

War, Revolution and Design: exploring pedagogy, practice based research and costume for performance through the Russian avant-garde theatre

This article recounts an edited conversation that took place at the V & A symposium ‘Russian Avant-garde Theatre: War Revolution and Design’ held on the 24 January 2014, which accompanied the exhibition of the same name. Fashion historian Amber Jane Butchart (V&A and London College of Fashion, University of the Arts London) led Melissa Trimingham (University of Kent) and Donatella Barbieri (London College of Fashion, University of the Arts London) in a conversation discussing the relationship of Russian costume design with the avant-garde in early Modernism across Europe

Bauhaus Stairway

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Man Edited By Heimo Kuchling

159 hlm.; ill.; 25 c

Die Rechenfertigkeit

von Oskar Schlemme