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. 2014 Feb 1;14(2):119–131. doi: 10.1089/ast.2013.1093

FIG. 5.

FIG. 5.

GC-MS total-ion chromatograms (TICs) of the three residues produced from the UV/EUV irradiations of H2O:pyrimidine ice mixtures with the 0th order beam light (top trace, irradiation time: 20 h), the He i line (top middle trace, 32 h), and the He ii line (middle trace, 32 h). The bottom middle trace corresponds to the TIC of the same H2O:pyrimidine=10:1 ice mixture deposited on the substrate for 25 h but not photo-irradiated, whose HPLC chromatogram is shown in Fig. 4a. The bottom trace corresponds to the injection of the MTBSTFA agent used to derivatize all residues, control samples, and standards in this study.