Table 2.
Logarithm of rate constants in s−1 from the fit of model 1 to the kinetics of intermediates determined by SVD-SM
| pH 8, 5°C | pH 8, 15°C | pH 8 | pH 7 | pH 6 | pH 5 | pH 4 | |
|---|---|---|---|---|---|---|---|
| Kr→Lr | 6.2 | 6.5 | 6.8 | 6.4 | 6.4 | 6.6 | 6.8 |
| Kr←Lr | 6.0 | 6.0 | 5.9 | 6.1 | 6.2 | 6.7 | 6.9 |
| Lr→Mr1 | 4.4 | 4.9 | 5.1 | 4.8 | 4.7 | 5.2 | 6.0 |
| Lr←Mr1 | 4.5 | 5.1 | 5.1 | 4.6 | 4.5 | 4.6 | 6.0 |
| Mr1→Mr2 | 3.9 | 4.4 | 4.4 | 4.3 | 4.2 | 4.6 | 5.2 |
| Mr2→BR | 2.8 | 3.1 | 3.7 | 3.6 | 3.8 | 3.6 | 3.5 |
| Ks→Ls | 5.6 | 5.9 | 6.2 | 6.2 | 6.2 | 6.3 | 6.3 |
| Ks←Ls | 4.2 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 | 4.7 |
| Ls→Ms1 | 2.8 | 3.2 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 |
| Ls←Ms1 | 3.9 | 4.5 | 4.7 | 4.5 | 4.6 | 4.3 | 4.1 |
| Ms1→Ms2 | 5.3 | 5.8 | 6.2 | 6.3 | 6.6 | 6.5 | 6.6 |
| Ms1←Ms2 | 2.0 | 2.3 | 2.5 | 3.0 | 4.4 | 5.0 | 5.5 |
| Ms2→BR | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 | 0.6 | 0.9 |
| r:s | 26:74 | 27:73 | 26:74 | 25:75 | 26:74 | 21:79 | 18:82 |
| χ2(×10−2) | 2.3 | 3.1 | 2.0 | 2.3 | 3.0 | 2.0 | 2.0 |
Output rate constants were obtained by fitting the parallel photocycle scheme, model 1, to the intermediate kinetics derived from the fit of measured difference spectra by the pure intermediate spectra from the SVD-SM analysis. Unless otherwise shown, the temperature was 25°C.