Cosmic Ice Laboratory Marla Moore Reggie Hudson Paul Cooper Zach Pozen
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Transcript of Cosmic Ice Laboratory Marla Moore Reggie Hudson Paul Cooper Zach Pozen
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Cosmic Ice Laboratory
Marla Moore
Reggie Hudson
Paul Cooper
Zach Pozen
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Solar System Surfaces
Comets
Interstellar
Icy Astrobiological Environments
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Interstellar Grains as Reaction Sites
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Hydrogen Flow UV-Photolysis LampFlux 5 x 1014 photon cm-2 s-1
Average energy 7.4 eV
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p+
IR Spectrometer
UV
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Focus of Astrobiology Related Research
•Complex organic products from energetically processed nitriles
Infrared SpectroscopyChemical Analysis
•Oxygen/Ozone/Hydrogen Peroxide — Paul Cooper
•Student projectsCH4
C2H4O isomersOCS
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Nitrile-CH3CN
•Acetonitrile has been detected on Titan, in cometary comae and in the ISM.
•If bombarded by radiation---
•More complex molecules?
•Prebiotic molecules result—
e.g.Amino acids ?
C
C
N
H
H
H
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(Hudson & Moore, Icarus, 2004)
HNC, CH2=C=NH, HCN (?)
OCN−, CH2=C=NH, HCN (?), CO2 (?)
CH3CN
p+
H2O p+
Nitriles Complex OrganicsInfrared Spectroscopy
ketenimine
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Formation of Ketenimine and HCN
A structural isomer:
C C N
H
H
H
Energetic input gives rapid isomerization or cleavage of C-C bond?
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Formation of OCN-
Polyatomic anion:-O C N
O C N-
Oxidation product of water and CH3CN
Intermediate in oxidation to CO2
Stabilized by resonance
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Formation of Carbon Dioxide
•CO2 is an oxidation product of OCN-
?
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Room temperature residues
Analysis of residue--Search for amino acid synthesis
.5
.55
.6
.65
.7
3500 3000 2500 2000 1500 1000 500
.5
.55
.6
.65
.7
3500 3000 2500 2000 1500 1000 500
Absorbance / Wavenumber (cm-1) Paged X-Zoom CURSOR
File # 1 : NEWSPCTR11 1/13/2005 1:31 PM Res= 4
288 K Irradiated CH3CN, Next Morning, Under Vacuum
MID IRSpectrum
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Nitriles Amino AcidsChemical Analysis
p+
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Sample
Aspartic Acid
Glycine
AlanineAlanine
ABAABA
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n-propylamine
i- propylamine
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Glycine
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Work in Progress
• Finish analysis of residues, blanks, and analysis of higher temperature experiments.
•Publish results
•Search for cytosine
and other pyrimidinescyanate (OCN
-)
HC C CN
N
N
NH2
O
H
H
H
energy
H2O
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Progress Report 2005
Talks and Posters:InvitedUMDNotre DameRPIIAU-AsilomarPacifiChem
Publications and Proposals:
DPS- posterNAI-Boulder-2 postersAOGS-Singapore-co-organized 2 sesssions-2 talksNASA Laboratory Workshop-2 postersACS-Atlanta-talk, 2 student postersAbSciCon-talk, poster
Hudson and Moore2 published2 in pressco-authored 1 book chapterco authors on A&A benzene related paperHudson only, 1 in press 1 book chapter proposed and accepted (with astrobiology component)1 AGU session proposed and accepted (with astrobiology connection)
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Facilities:
•New electron gun has arrived
•Money for new optical bench has been received
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http://www.eckerd.edu/academics/chemistry/courses/ch210/
Education outreach:
Astrobiology courses taught
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Mentored 3 students
Zach Pozen
2 studentsfrom the US Naval Academy
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www-691.gsfc.nasa.gov/cosmic.ice.lab
Web page is up to date
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Session 18---Tuesday 3:45
Ice Prebiotic Chemistry of Nitriles: Identification ofComplex Organic Products
Reggie Hudson
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Uv and ion bombardmentMeV
Cosmic RayMagnetospheric
H+
On+, Sn+
Bombardment
Photolysis
UV Photons
Sputtering
Radiolysis
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