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SUMMARY:What are the Clouds of Venus made of? - Paul B. Rimmer (University
  of Cambridge)
DTSTART:20231121T111500Z
DTEND:20231121T120000Z
UID:TALK208369@talks.cam.ac.uk
CONTACT:David Buscher
DESCRIPTION:The clouds of Venus are believed to be composed of sulfuric ac
 id (H2SO4) and minor constituents including iron-bearing compounds\, and t
 heir respective concentrations vary with height in the thick Venusian atmo
 sphere. I will talk about an experimentally investigation into possible ir
 on-bearing mineral phases that are stable under the unique conditions with
 in Venusian clouds. This work was carried out in collaboration with physic
 ists and geochemists. Together\, we found that that ferric iron can react 
 with sulfuric acid to form two mineral phases: rhomboclase and acid ferric
  sulfate. A combination of these two mineral phases and dissolved Fe3+ in 
 varying concentrations of sulfuric acid are shown to be good candidates fo
 r explaining the 200−300nm and 300−500nm features of the reported unkn
 own UV absorber. I will show this comparison\, and conclude by speculating
  about a rich\, largely unexplored heterogeneous chemistry in the cloud dr
 oplets of Venus that has a large affect on the optical properties of the c
 louds and could change the behavior of trace gas species throughout Venus
 ’s atmosphere.
LOCATION:Coffee area\, Battcock Centre
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