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Sekhar, B. N. Raja
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article
Thio residue from thermal processing of cometary ices containing carbon disulfide and ammonia
Abstract
<p>We have carried out experimental investigation on binary ice mixture containing carbon disulfide (CS<sub>2</sub>) and ammonia (NH<sub>3</sub>) ices formed at 10 K. Icy films were formed in various combinations to investigate the reactivity of CS<sub>2</sub>and NH<sub>3</sub>molecules on cometary nucleus. In the case of NH<sub>3</sub>ices, deposition carried out at 10 K was found to contain NH<sub>3</sub>homo-dimers that was found to reorient upon annealing to 40 K. Phase transition was found to take place as the 10 K ice was warmed to higher temperatures and the phase transition temperature was found to be 5 K higher for the mixed ice in comparison to the layered deposits. Thermal processing of the mixed deposition of CS<sub>2</sub>-NH<sub>3</sub>ice was found to leave thio residue, which could be ammonium dithiocarbamate that was even found to be present at 340 K.</p>