Table 4
MIR vibration mode peak positions of H2CO3 ice observed in FT-IR transmission spectra of 1 keV electron irradiated CO2:H2O (6:1) ice mixtures annealed to different temperatures.
| Literature | H2CO3 irr, 20 K | H2CO3 irr, 80 K | Vibration | |||
|---|---|---|---|---|---|---|
| β-H2CO3 | γ-H2CO3 | Ann, 220 K | Ann, 225 K | Ann, 200 K | Ann, 225 K | |
| [cm−1](a) | [cm−1](b) | [cm−1] | [cm−1] | [cm−1] | [cm−1] | |
| 2850 | 2853 | 2892 | 2850 | 2855 | 2841 | O−H stretch |
| 2620 | 2610 | 2604 | 2632 | 2631 | 2633 | O−H stretch |
| 1723 | 1766 | 1722 | 1726 | 1714 | 1715 | C =O stretch |
| 1483 | 1505 | 1480 | 1514 | 1508 | 1510 | C−OH a-sym stretch |
| 1292 | 1309 | 1302 | 1314 | 1313 | 1309 | C−OH in-plane bend |
| 1038 | 1030 | 1026 | 1037 | 1040 | 1036 | C−OH sym stretch |
| 908 | 903 | 908 | 900 | 912 | C−OH out-of-plane bend | |
| 812 | 809 | 808 | 801 | 800 | CO3 out-of-plane bend | |
Notes. Data are compared to literature values acquired in reflection mode at 10− 20 K. (a) Zheng & Kaiser (2007) – CO2 :H2O (2.5:1) ice mixture exposed to 5 keV electrons at 10 K for 3 h and then warmed to 210 K; (b) Oba et al. (2010) – Simultaneous deposition of CO and OH species on a 20 K gold surface followed by warm up to 220 K.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.