In situ measurements of the radiation stability of amino acids at 15-140K

Academic Article


  • We present new kinetics data on the radiolytic destruction of amino acids measured in situ with infrared spectroscopy. Samples were irradiated at 15, 100, and 140K with 0.8-MeV protons, and amino-acid decay was followed at each temperature with and without H 2O present. Observed radiation products included CO 2 and amines, consistent with amino-acid decarboxylation. The half-lives of glycine, alanine, and phenylalanine were estimated for various extraterrestrial environments. Infrared spectral changes demonstrated the conversion from the non-zwitterion structure NH 2CH 2(R)COOH at 15K to the zwitterion structure +NH 3CH 2(R)COO - at 140K for each amino acid studied. © 2012.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Gerakines PA; Hudson RL; Moore MH; Bell JL
  • Start Page

  • 647
  • End Page

  • 659
  • Volume

  • 220
  • Issue

  • 2