1 / 26

Cosmic Ice Laboratory Marla Moore Reggie Hudson Paul Cooper Zach Pozen

Cosmic Ice Laboratory Marla Moore Reggie Hudson Paul Cooper Zach Pozen. Icy Astrobiological Environments. Solar System Surfaces. Comets. Interstellar. Interstellar Grains as Reaction Sites. Hydrogen Flow UV-Photolysis Lamp Flux 5 x 10 14 photon cm -2 s -1 Average energy 7.4 eV.

fausto
Télécharger la présentation

Cosmic Ice Laboratory Marla Moore Reggie Hudson Paul Cooper Zach Pozen

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cosmic Ice Laboratory Marla Moore Reggie Hudson Paul Cooper Zach Pozen

  2. Icy Astrobiological Environments Solar System Surfaces Comets Interstellar

  3. Interstellar Grains as Reaction Sites

  4. Hydrogen Flow UV-Photolysis Lamp Flux 5 x 1014 photon cm-2 s-1 Average energy 7.4 eV

  5. IR Spectrometer UV p+

  6. Focus of Astrobiology Related Research • Complex organic products from energetically • processed nitriles • Infrared Spectroscopy • Chemical Analysis • Oxygen/Ozone/Hydrogen Peroxide — Paul Cooper • Student projects • CH4 • C2H4O isomers • OCS

  7. 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 ?

  8. Nitriles  Complex Organics Infrared Spectroscopy CH3CN (Hudson & Moore, Icarus, 2004) ketenimine p+ • HNC, CH2=C=NH, HCN (?) • OCN−,CH2=C=NH, HCN (?), CO2 (?) H2O p+

  9. Formation of Ketenimine and HCN A structural isomer: Energetic input gives rapid isomerization or cleavage of C-C bond ?

  10. Formation of OCN- Polyatomic anion: Stabilized by resonance Oxidation product of water and CH3CN Intermediate in oxidation to CO2

  11. Formation of Carbon Dioxide • CO2 is an oxidation product of OCN- ?

  12. MID IR Spectrum Room temperature residues Analysis of residue-- Search for amino acid synthesis

  13. Nitriles Amino Acids Chemical Analysis p+ 

  14. gABA bABA bAlanine Alanine Glycine Aspartic Acid Sample

  15. n-propylamine i- propylamine

  16. Glycine

  17. Work in Progress • Finish analysis of residues, blanks, and analysis of higher temperature experiments. • Publish results • Search for cytosine • and other pyrimidines

  18. Progress Report 2005 Talks and Posters: Invited UMD Notre Dame RPI IAU-Asilomar PacifiChem Publications and Proposals: DPS- poster NAI-Boulder-2 posters AOGS-Singapore-co-organized 2 sesssions-2 talks NASA Laboratory Workshop-2 posters ACS-Atlanta-talk, 2 student posters AbSciCon-talk, poster Hudson and Moore 2 published 2 in press co-authored 1 book chapter co authors on A&A benzene related paper Hudson only, 1 in press 1 book chapter proposed and accepted (with astrobiology component) 1 AGU session proposed and accepted (with astrobiology connection)

  19. Facilities: • New electron gun has arrived • Money for new optical bench has been received

  20. Education outreach: Astrobiology courses taught http://www.eckerd.edu/academics/chemistry/courses/ch210/

  21. Mentored 3 students 2 students from the US Naval Academy Zach Pozen

  22. Web page is up to date www-691.gsfc.nasa.gov/cosmic.ice.lab

  23. Session 18---Tuesday 3:45 Ice Prebiotic Chemistry of Nitriles: Identification of Complex Organic Products Reggie Hudson

  24. Uv and ion bombardment MeV Cosmic Ray Magnetospheric H+ On+, Sn+ Bombardment UV Photons Sputtering Photolysis Radiolysis

More Related