S1 SUPPORTING INFORMATION for paper Carbamate Formation in the System (2-Methylpiperidine + Carbon Dioxide) by Raman Spectroscopy and X-Ray Diffraction by O. Fandiño, S. Sasidharanpillai, D.V.Soldatov and P. R. Tremaine* LIST OF TABLES Table S1. Isotropic Raman activity (IRA) and frequencies for the four possible spatial configurations of the 2-methylpiperidine molecule according to Gaussian calculations (eq, equatorial; ax, axial; Me, methyl group; H, hydrogen). Table S2. Isotropic Raman activity (IRA) and frequencies for the four possible spatial configurations of the 2-methylpiperidinium ion according to Gaussian calculations (eq, equatorial, ax, axial, Me, methyl group). Table S3. Experimental Raman frequencies (ṽ max ), widths (FWHM) and relative areas (A i /A 790 ) for the solids of 2-methylpiperidinium 2-methylpiperidine-N-carboxylate at the bottom of the NMR tube from unpolarised Raman spectra. Table S4. Experimental Raman frequencies (ṽ max ), widths (FWHM) and relative areas (A i /A 782 ) for the crystals of the 2-methylpiperidinium chloride salt from unpolarised Raman spectra.