Table 1.
Spectral parameters of the νOD of liquid solvent, solutions of gases, NaCl solution, clathrates, and ice
| Sample | T | p | νOD | ΔνOD | Hw |
| Pure solvent* | 293 | 1 | 2,502 (±1) | 0 | 164 (±2) |
| Pure solvent* | 293 | 56 | 2,502 (±1) | 0 (±2) | 160 (±2) |
| Pure solvent* | 285 | 1 | 2,498 (±1) | 4 (±2) | 158 (±2) |
| Pure solvent* | 285 | 56 | 2,498 (±1) | 4 (±2) | 158 (±2) |
| CH4 solution† | 285 | 56 | 2,445 (±5) | 57 (±8) | 92 (±8) |
| C2H5 solution† | 291 | 14 | 2,430 (±5) | 78 (±8) | 86 (±8) |
| Xe solution† | 299 | 16 | 2,442 (±5) | 60 (±8) | 96 (±8) |
| Kr solution† | 289 | 50 | 2,445 (±5) | 57 (±8) | 87 (±8) |
| NaCl solution‡ | 285 | 53 | 2,536 (±5) | −34 (±8) | 166 (±8) |
| CH4 clathrate§ | 275 | 40 | 2,446 (±1) | 56 (±2) | 60 (±2) |
| C2H5 clathrate§ | 276 | 7 | 2,442 (±1)¶ | 60 (±2) | 80 (±2) |
| Xe clathrate§ | 292 | 18 | 2,442 (±1) | 60 (±2) | 79 (±2) |
| Kr clathrate§ | 274 | 56 | 2,446 (±1) | 56 (±2) | 55 (±2) |
| Ice Ih | 271 | 1 | 2,445 (±1) | 57 (±2) | 37 (±2) |
Temperature T (Kelvin), pressure p (bar), frequency at maximum intensity νOD (centimeters−1), frequency redshift ΔνOD (centimeters−1), and half-width Hw (centimeters−1) are shown. Hw is defined as the width of a peak at one-half height. Errors in measuring T and p are estimated at 0.5 K and 0.5 bars, respectively. All samples contain a solvent mixture of 2.8% HDO in H2O.
Solvent mixture (2.8% HDO in H2O) under four different conditions.
Spectral parameters of the water molecules perturbed by solutes (Fig. 1B).
Solution of 0.03 M NaCl used for verification of the subtraction procedure (SI Appendix, Figs. S4 and S6). Note that the Hw of its νOD is equal to that of liquid solvent.
Solid state (SI Appendix, Fig. S3).
Shoulder at 2,472 (±1) cm−1.