21-EPN-FT1-003: Spectral signatures of amino acid and polypeptide embedded in water ices – Implications for biosignature identification on icy moons
Visit by Surendra Vikram Singh and Bhalamurugan Sivaraman, Physical Research Laboratory (India), to TA2.8 CSS (Cold Surfaces Spectroscopy) at IPAG (France).
Dates of visit: 23 May – 08 June 2022
Report Summary: The objective of the experiments was to obtain a spectral library of biomolecules such as amino acids in water ice in context of icy bodies of solar system. We performed a series of measurements obtaining reflectance spectra of glycine –water ice mixtures in the VIS-NIR range (0.4-4.2 μm) at the temperature range of 110-250 K and at three different concentrations, using Cold Surface Spectroscopy Facility (CSS) setup at IPAG. Glycine – water ice mixtures were studied in two different mixing modes (inter and intra mixing) to get the spectral variations due to dissolving amino acids into water. Reflectance spectra of pure glycine and pure water ice were also obtained for reference. Reflectance spectra for a shocked glycine sample (obtained from HISTA facility at PRL) was also studied to understand the effect of shock induced chemistry. These measurements will support to find the spectral signature of amino acids on icy bodies of solar system.