Table 2.
Time constants and percent amplitudes (in parentheses) from global fits to transient absorption signals (266 nm pump / 250 nm probe) for various DNAs.a, b Amplitudes do not sum to one hundred percent due to a small amount of residual photobleaching.
| System | Solvent | τ1 (ps) | τ2 (ps) |
|---|---|---|---|
| CMP + GMP | H2O | 2.0 ± 0.3 (92) | 31 ± 26 (8) |
| D2O | 2.6 ± 0.4 (91) | 31 ± 26 (9) | |
| d(C4G4)·d(C4G4) | H2O | 3.1 ± 0.7 (61) | 22 ± 5 (32) |
| D2O | 3.1 ± 0.7 (60) | 22 ± 5 (33) | |
| d[(GX)9GC] | H2O | 5.1 ± 1.0 (72) | 25 ± 5 (25) |
| D2O | 6.6 ± 2.0 (55) | 25 ± 5 (43) |
a
Stated uncertainties are twice the standard error.
b
Parameters with identical values and uncertainties were globally linked during fitting.