Open Access
Table B.1
Peak position and FWHM of methyl cyanide CH3 symmetric stretching mode (2940.9 cm−1/3.400 µm) in pure and mixed ices at temperatures ranging from 15 - 150 K.
| T | Matrix | 1:5 | 1:10 | 1:20 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Peak | FWHM | Peak | FWHM | Peak | FWHM | Peak | FWHM | Peak | FWHM | Peak | FWHM | ||
| (cm−1) | (cm−1) | (µm) | (µm) | (cm−1) | (cm−1) | (µm) | (µm) | (cm−1) | (cm−1) | (µm) | (µm) | ||
| 15 | Pure ice | 2940.9 | 10.9 | 3.400 | 0.013 | - | - | - | - | - | - | - | - |
| H2O | 2942.8 | 12.5 | 3.398 | 0.014 | 2944.8 | 12.2 | 3.396 | 0.014 | 2944.8 | 11.8 | 3.396 | 0.014 | |
| CO | 2944.3 | 7.4 | 3.396 | 0.009 | 2945.7 | 11.7 | 3.395 | 0.013 | - | - | - | - | |
| CO2 | 2952.0 | 16.6 | 3.388 | 0.019 | 2954.4 | 17.9 | 3.385 | 0.020 | - | - | - | - | |
| CH4 | 2940.4 | 8.7 | 3.401 | 0.010 | 2941.4 | 7.5 | 3.400 | 0.009 | 2941.4 | 8.6 | 3.400 | 0.010 | |
| NH3 | 2934.2 | 18.0 | 3.408 | 0.021 | 2931.8 | 18.0 | 3.411 | 0.021 | 2934.2 | 15.2 | 3.408 | 0.018 | |
| H2O:CO2 | - | - | - | - | 2945.7 | 13.9 | 3.395 | 0.016 | - | - | - | - | |
| 4 comp | - | - | - | - | - | - | - | - | 2941.4 | 14.1 | 3.340 | 0.016 | |
| 30 | Pure ice | 2940.9 | 10.6 | 3.400 | 0.012 | - | - | - | - | - | - | - | |
| H2O | 2942.4 | 12.5 | 3.399 | 0.014 | 2943.8 | 11.8 | 3.397 | 0.014 | 2944.8 | 12.1 | 3.396 | 0.014 | |
| CO | 2943.8 | 7.9 | 3.397 | 0.009 | 2945.3 | 13.3 | 3.395 | 0.015 | - | - | - | - | |
| CO2 | 2951.0 | 13.9 | 3.389 | 0.016 | 2953.4 | 17.3 | 3.386 | 0.020 | - | - | - | - | |
| CH4 | 2940.4 | 8.3 | 3.401 | 0.010 | 2940.9 | 7.8 | 3.400 | 0.009 | 2940.4 | 11.2 | 3.401 | 0.013 | |
| NH3 | 2933.7 | 16.8 | 3.409 | 0.020 | 2932.7 | 17.2 | 3.410 | 0.020 | 2934.6 | 15.3 | 3.408 | 0.018 | |
| H2O:CO2 | - | - | - | - | 2947.2 | 13.9 | 3.393 | 0.016 | - | - | - | - | |
| 4 comp | - | - | - | - | - | - | - | - | 2940.4 | 13.2 | 3.401 | 0.015 | |
| 50 | Pure ice | 2940.7 | 10.0 | 3.401 | 0.012 | - | - | - | - | - | - | - | |
| H2O | 2942.8 | 12.4 | 3.398 | 0.014 | 2945.3 | 11.8 | 3.395 | 0.014 | 2944.3 | 12.6 | 3.396 | 0.015 | |
| CO2 | 2950.6 | 13.9 | 3.389 | 0.016 | 2953.0 | 16.1 | 3.386 | 0.018 | - | - | - | - | |
| CH4 | 2941.4 | 9.5 | 3.400 | 0.011 | 2941.4 | 8.3 | 3.400 | 0.009 | 2939.9 | 11.2 | 3.401 | 0.013 | |
| NH3 | 2933.2 | 17.3 | 3.409 | 0.020 | 2931.8 | 18.5 | 3.411 | 0.022 | 2936.1 | 15.2 | 3.406 | 0.018 | |
| H2O:CO2 | - | - | - | - | 2947.7 | 13.9 | 3.392 | 0.016 | - | - | - | - | |
| 4 comp | - | - | - | - | - | - | - | - | 2942.4 | 12.6 | 3.399 | 0.014 | |
| 80 | Pure ice | 2940.9 | 9.6 | 3.400 | 0.011 - | - | - | - | - | - | - | - | |
| H2O | 2942.8 | 12.0 | 3.398 | 0.014 | 2945.7 | 11.2 | 3.395 | 0.013 | 2945.3 | 10.9 | 3.395 | 0.013 | |
| CO2 | 2950.1 | 15.2 | 3.390 | 0.017 | 2942.4 | 11.1 | 3.399 | 0.013 | - | - | - | - | |
| NH3 | 2934.6 | 16.9 | 3.408 | 0.020 | 2933.7 | 20.1 | 3.409 | 0.023 | 2936.6 | 14.2 | 3.405 | 0.016 | |
| H2O:CO2 | - | - | - | - | 2945.7 | 13.3 | 3.395 | 0.015 | - | - | - | - | |
| 4 comp | - | - | - | - | - | - | - | - | 2945.3 | 11.3 | 3.395 | 0.013 | |
| 100 | Pure ice | 2940.2 | 4.0 | 3.401 | 0.005 | - | - | - | - | - | - | - | - |
| H2O | 2942.8 | 11.8 | 3.398 | 0.014 | 2945.7 | 11.2 | 3.395 | 0.013 | 2945.3 | 10.4 | 3.395 | 0.012 | |
| CO2 | 2940.9 | 9.6 | 3.400 | 0.011 | - | - | - | - | - | - | - | - | |
| NH3 | 2939.9 | 9.4 | 3.401 | 0.011 | 2939.9 | 8.8 | 3.401 | 0.010 | 2938.0 | 11.9 | 3.404 | 0.014 | |
| H2O:CO2 | - | - | - | - | 2947.7 | 12.8 | 3.392 | 0.015 | - | - | - | - | |
| 4 comp | - | - | - | - | - | - | - | - | 2944.3 | 10.6 | 3.396 | 0.012 | |
| 120 | Pure ice | 2940.2 | 2.8 | 3.401 | 0.003 | - | - | - | - | - | - | - | - |
| H2O | 2941.9 | 11.1 | 3.399 | 0.013 | 2945.7 | 11.2 | 3.395 | 0.013 | 2945.3 | 9.4 | 3.395 | 0.011 | |
| NH3 | 2940.4 | 3.4 | 3.401 | 0.004 | 2940.4 | 3.3 | 3.401 | 0.004 | 2938.0 | 11.9 | 3.404 | 0.014 | |
| H2O:CO2 | - | - | - | - | 2945.7 | 14.0 | 3.395 | 0.016 | - | - | - | - | |
| 4 comp | - | - | - | - | - | - | - | - | 2945.7 | 11.0 | 3.395 | 0.013 | |
| 140 | Pure ice | 2940.4 | 3.0 | 3.401 | 0.003 | - | - | - | - | - | - | - | - |
| H2O | 2940.9 | 4.6 | 3.400 | 0.005 | 2940.9 | 4.4 | 3.400 | 0.005 | 2940.9 | 4.9 | 3.400 | 0.006 | |
| NH3 | - | - | - | - | - | - | - | - | - | - | - | - | |
| H2O:CO2 | - | - | - | - | 2940.9 | 3.9 | 3.400 | 0.005 | - | - | - | - | |
| 4 comp | - | - | - | - | - | - | - | - | - | - | - | - | |
| 150 | Pure ice | 2940.7 | 3.1 | 3.401 | 0.004 | - | - | - | - | - | - | - | - |
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