^aVibrational Spectroscopy Facility, School of Chemistry, The University of Sydney, Sydney, NSW, 2006, AustraliaAustralian Centre for Astrobiology, Macquarie University Biotechnology Research Institute, Sydney, NSW 2109, Australia

^bAustralian Centre for Astrobiology, Macquarie University Biotechnology Research Institute, Sydney, NSW 2109, Australia

^cDepartment of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA 02139, USA