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SUMMARY:The new RAIRS system at the THz/Far-IR Beamline - Laboratory Astro
 chemistry.
DTSTART;VALUE=DATE-TIME:20161124T033000Z
DTEND;VALUE=DATE-TIME:20161124T034500Z
DTSTAMP;VALUE=DATE-TIME:20260809T074142Z
UID:indico-contribution-893@events01.synchrotron.org.au
DESCRIPTION:Speakers: Courtney Ennis (La Trobe University)\nThe second hal
 f of 2016 has seen the completion of a bespoke experiment installed at the
  THz/Far-IR Beamline. Funded by the ARC through CI Ennis' DECRA project\, 
 the apparatus has been designed for dual-purpose Matrix-Isolation and Refl
 ection-Absorption Infrared Spectroscopy studies. A chamber sitting within 
 the beamline’s Bruker FTIR sample compartment reaches high-vacuum by dif
 ferential pumping. This chamber supports the second-stage of a compressed 
 helium cryocooler where the mounted sample surfaces (either IR transmissio
 n windows or polished metal substrates for reflection studies) can be cool
 ed to 10 K. Low temperature chemical vapour deposition methods are used to
  deposit thin films of molecular ices where their morphologies can be cont
 rolled by annealing the solid. Alternatively\, inert matrices of noble gas
 es containing reactive radicals and intermediates could be produced by ele
 ctric discharge or photolysis of the deposition gas stream. 270 degree rot
 ation of the coldhead allows for sequential ‘sample deposition/spectrum 
 acquisition’ for temporal film growth studies\, as well as allowing for 
 transmission and grazing angle measurements to be performed on the same in
 strument.\n\nInitial experiments will interrogate the physical and optical
  properties of thin nitrile films. Small nitrile molecules\, such as hydro
 gen cyanide\, acetonitrile\, and propionitrile have all been identified in
  their condensed phase within the cold atmosphere of Saturn’s largest mo
 on Titan. The product of ongoing photochemical and fast particle processin
 g of nitrogen and methane in the ionosphere\, nitrile species transport to
  lower altitudes. Here\, they can condense as icy layers on the surfaces o
 f haze particles\, where the layer morphology is specific to the physical 
 conditions present at the atmospheric location. The condensed-phase also a
 ct as sites where higher-order chemistry can unfold more efficiently than 
 the gas – such as complex cyanide chemistry pathways thought to lead to 
 amino-acid synthesis in cold\, extra-terrestrial environments.\n\nThis tal
 k will introduce our first forays into laboratory astrochemistry at the Au
 stralian Synchrotron\; connecting previous aerosol experiments to our curr
 ent thin-film work on nitrile ice morphology. Also highlighted will be new
  DFT methods (using computationally lenient code Crystal14) that have retu
 rned accurate vibrational frequencies\, particularly for intermolecular tr
 anslation and libration modes associated with the far-IR for molecular cry
 stals. Finally\, the capabilities of the new RAIRS system will be detailed
  to promote its use amongst the infrared beamline community as an addition
 al accessory for low temperature analysis of the condensed-phases.\n\nhttp
 s://events01.synchrotron.org.au/event/39/contributions/893/
LOCATION:Conference Rooms
URL:https://events01.synchrotron.org.au/event/39/contributions/893/
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