| Vibrational mode | DME(g) [33] [34] | DME(a) on Al2O3 at 150 K [34] | DME(a) on CeO2 at 300 K [28] | CH3O(a) on TiO2 at 300 K [35] | HCOO(a) on TiO2 at 300 K [14] | DME on TiO2 at 300 K [present study] | DME on Rh/TiO2 at 300 K [present study] |
| υa(CH3) | 2996 2925 | 2984 2922 | 2953 | 2965 2930 | 2958 | 2950 2921 | 2952 2906 |
| υs(CH3) | 2817 | 2821 | 2841 | 2830 | 2886 | 2878 | 2879 |
| 2δ(CH3) | 2887 | 2890 | 2884 | 2842 | 2838 | ||
| υa(OCO) | 1552 | ||||||
| υs(OCO) | 1377 | ||||||
| δas(CH3) | 1470 | 1477 | 1436 | 1462 | 1459 | 1458 | |
| δs(CH3) | 1456 | 1459 | 1436 | ||||
| γ(CH3) | 1244 1179 | 1252 1116 | 1229 1159 | 1151 | 1253 1159 | 1253 1153 | |
| υas(CO) | 1102 | 1092 | 1066 | 1125 | 1277 | 1063 | 1052 |