Table 2.
Values of the parameters, obtained fitting QENS spectra with equation (A 7). Units for DTfast, DTslow, DRfast and DRslow, are expressed in [10−3 mm2 s−1], while τfast and τlow are expressed in [ps] and ΓCH2 in [meV]. The associated errors (in brackets) have been estimated using the Minuit minimization algorithm and the Minuit processor MINOS.
| f | pfast | pslow | pCH2 | DTfast | DRfast | τfast | DTslow | DRslow | τslow | ΓCH2 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RH | 0.040 (0.002) |
0.736 (0.002) |
0.123 (0.002) |
0.100 (0.002) |
2.5 (0.01) |
2.3 (0.2) |
1.8 (0.1) |
0.20 (0.02) |
1.10 (0.05) |
6.7 (0.3) |
0.39 (0.02) |
| bulk watera | 2.5 | 2.3 | 0.9 | ||||||||
| bulk waterb | 2.3 | 1.1 |
aDiffusion coefficient of bulk water determined experimentally from a scan of pure water (Dw) measured at 300 K on IN5 at the same energy resolution.
bDiffusion coefficient of bulk water found in the literature [50] for T = 298 K.