TABLE 1.
Values of the biphotonic ionization parameters obtained by least-square fitting of the experimental values for Q+ with Eq. 2a as explained in the text
| Guanines | ϕ1 × 10−3 | *ϕ1σ1 × 10−20 | ϕ2σ2 × 10−17 | Q+max × 10−3 | Es J/cm2 |
|---|---|---|---|---|---|
| I-G2 | 9.7 | 22.3 | 1.4 | 8.2 | 0.100 |
| I-G3 | 3.7 | 8.5 | 12.1 | 3.5 | 0.014 |
| I-G4 | 9.1 | 20.9 | 3.2 | 8.1 | 0.046 |
| I-G5 | 4.7 | 10.8 | 2.1 | 3.7 | 0.073 |
| I-G6 | 4.2 | 9.7 | 12.5 | 4.1 | 0.014 |
| I-G7 | 18.6 | 42.8 | 2.8 | 15.7 | 0.050 |
| I-G8 | 2.3 | 5.3 | 3.8 | 2.2 | 0.045 |
| I-〈G2-7〉 | 6.7 | 15.4 | 3.6 | 6.2 | 0.043 |
| II-G6 | 12.0 | 27.6 | 9.3 | 11.0 | 0.017 |
| II-G7 | 18.9 | 43.5 | 3.0 | 15.6 | 0.045 |
| II-G6 ss | 7.5 | 17.0 | 1.5 | 6.3 | 0.099 |
| II-G7 ss | 8.1 | 18.5 | 1.3 | 6.7 | 0.107 |
| III-G1 | 12.2 | 28.0 | 4.3 | 10.1 | 0.035 |
| III-G2 | 2.8 | 6.4 | 4.4 | 2.2 | 0.038 |
| III-G3 | 5.4 | 12.4 | 7.2 | 5.1 | 0.023 |
| III-G4 | 17.1 | 39.3 | 2.8 | 14.5 | 0.048 |
| III-G5 | 2.2 | 5.0 | 5.5 | 2.3 | 0.031 |
| III-〈G3-5〉 | 8.1 | 18.6 | 3.9 | 7.3 | 0.040 |
| V-G3 | 6.4 | 14.7 | 4.4 | 5.9 | 0.037 |
| V-G4 | 11.4 | 26.2 | 2.6 | 9.9 | 0.057 |
| V-G5 | 3.9 | 9.5 | 3.7 | 3.6 | 0.043 |
| V-〈G3-5〉 | 7.1 | 16.3 | 3.3 | 6.4 | 0.047 |
| IV-G3 | 3.5 | 8.0 | 8.6 | 3.4 | 0.020 |
| IV-G4 | 14.6 | 33.6 | 2.1 | 12.2 | 0.066 |
| IV-G5 | 16.1 | 37.0 | 1.7 | 13.1 | 0.078 |
| IV-G6 | 15.4 | 35.4 | 1.6 | 12.6 | 0.080 |
| IV-G7 | 1.8 | 4.1 | 6.3 | 1.6 | 0.028 |
| IV-〈G3-7〉 | 9.4 | 21.6 | 2.4 | 8.2 | 0.060 |
| VI-G3 | 7.1 | 16.3 | 3.1 | 6.4 | 0.050 |
| VI-G4 | 8.5 | 19.6 | 3.9 | 7.7 | 0.040 |
| VI-G5 | 9.7 | 22.3 | 3.2 | 8.6 | 0.046 |
| VI-G6 | 10.0 | 23.0 | 3.5 | 8.9 | 0.042 |
| VI-G7 | 4.6 | 10.6 | 4.6 | 4.3 | 0.034 |
| VI-〈G3-7〉 | 7.9 | 18.2 | 3.6 | 7.2 | 0.043 |
| †Free Gua | 1.3 | 5.5 | 0.5 | 1.2 | 0.300 |
*
σ1 = 2.3 × 10−17 cm2.
†
Data from Nikogosyan et al. (1982).
〈…〉, average values; ss, single-stranded. The values for G1 and G2 for duplexes-IV to -VI are equals to those for duplex-III. Standard deviations were usually within 5%, but for the weakest guanine cleavage bands they increased to 10–15%.