Table 2.
The fraction of water hydrogens associated with either lipid phosphate or carbonyl groups, ⟨n⟩, along with the number of water hydrogens per lipid associated with each lipid component. The vibrational lifetimes for both water- and lipid-associated molecules, as discussed in relation to Fig. 5, are given in units of picoseconds. The peak maxima ωpeak and full widths at half-max (FWHM) for both the theoretical and experimental linear absorption spectra, shown in Fig. 7, are presented in units of cm−1.
| X | 2 | 4 | 6 | 8 | 16 | Bulk |
|---|---|---|---|---|---|---|
| ⟨n⟩ | 0.72 | 0.54 | 0.43 | 0.36 | 0.20 | ... |
| #∕phosphate | 1.9 | 2.6 | 3.1 | 3.5 | 3.8 | ... |
| #∕carbonyl | 0.95 | 1.6 | 1.9 | 2.2 | 2.5 | ... |
| Twater | 6.7 | 3.3 | 2.8 | 2.7 | 2.4 | 1.8 |
| Tlipid | 3.1 | 1.7 | 1.5 | 1.5 | 1.5 | ... |
| ωpeak, theory | 2474 | 2474 | 2480 | 2485 | 2498 | 2515 |
| ωpeak, expt. | 2489 | 2497 | 2501 | 2505 | 2508 | 2514 |
| FWHM, theory | 203 | 219 | 214 | 215 | 211 | 178 |
| FWHM, expt. | 160 | 173 | 177 | 177 | 177 | 167 |