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CATEGORIES:Cavendish Astrophysics Seminars
SUMMARY:Gravitation\, Condensation\, Deuteration\, Star Fo
 rmation (or how to piece together the chemical and
  physical influences thereof!) - Helen Fraser (Uni
 versity of Strathclyde)
DTSTART;TZID=Europe/London:20110201T163000
DTEND;TZID=Europe/London:20110201T173000
UID:TALK29611AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/29611
DESCRIPTION:The detailed chemical processes occurring in star-
 forming regions in our own galaxy and extra-galact
 ic sources are key to the generation of molecules 
 in these regions\, which in turn are our windows (
 through observational spectroscopy) on the key fac
 tors influencing star-formation\, such as turbulen
 t mixing\, gravitational collapse\, chemical evolu
 tion and magnetic support\, which all occur over s
 imilar length and time-scales.  Since the largest 
 molecular reservoir in such regions is actually th
 e condensed matter on interstellar dust grains (kn
 own as 'ice')\, my research focuses on the chemica
 l and physical attributes of ices in star forming 
 regions.\n\nIn this talk I'll show a range of rece
 nt results on interstellar ice studies in the labo
 ratory - covering deuteration of H2O in space (via
  surface reactions of D+H2O / D+CH3OH and CD3Od +H
 2O)\, the formation of CO2 'ice' via surface react
 ions with OH radicals\, the 'sticky' properties of
  interstellar ice\, and how this relates to the ea
 rliest stages of planet formation (as tested under
  microgravity conditions)\; theoretical studies of
  ice formation - using molecular dynamics codes to
  study the formation of porous ices and understand
  the hydrogen bonding in such systems\, and recent
  observational data on ice mapping\, showing that 
 the distribution of ices in interstellar space is 
 perhaps more closely related to the phyical motion
  rather than the chemical soup of a particular sta
 r-forming clump.
LOCATION:Martin Ryle Seminar Room\, Kavli Building
CONTACT:David Titterington
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