Open Access
Table 2
Infrared band assignments (cm−1) of NH3, HCOOH, andCH3COOH as pure ices and as ice mixtures.
| Mode | NH3 | HCOOH | HCOOH:NH3 | H2O:HCOOH:NH3 | CH3COOH | CH3COOH:NH3 | ||
|---|---|---|---|---|---|---|---|---|
| (i) | (ii) | (iii) | (iv) | (v) | (vi) | (vii) | (viii) | |
| NH3 (ν4, NH bend) | 1641 | − | − | − | − | − | − | − |
| NH3 (ν3, NH bend) | 3375 | − | 3380 | − | − | − | − | − |
| HCOOH (ν, C–O st) | − | 1222 | 1216 | − | − | − | − | − |
| HCOOH (ν, C=O st) | − | 1743 | 1730 | 1710 | 1697 | − | − | − |
| HCOO− (ν4,C–O s-st) | − | − | 1346 | 1353 | 1353 | − | − | − |
| HCOO− (δ, CH st) | − | − | 1382 | − | 1384 | − | − | − |
| NH4+ (ν4, NH bend) | − | − | 1487 | 1475 | 1482 | − | − | 1500 |
| HCOO− (ν2, C–O a-st) | − | − | 1579 | 1621 | 1608 | − | − | − |
| CH3COOH (ν, C=O st) | − | − | − | − | − | 1724 | 1716 | 1700 |
| CH3COOH (ν, C=O a−st) | − | − | − | − | − | 1643 | 1655 | − |
| CH3COOH (δ, CH3 a−st) | − | − | − | − | − | 1413 | 1428 | − |
| CH3COOH (ν, C–O st) | − | − | − | − | − | 1307 | 1290 | 1292 |
| CH3COO− (ν, C=O st) | − | − | − | − | − | − | − | 1575 |
| CH3COO− (ν, C=O a-st) | − | − | − | − | − | − | − | 1428 |
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