Table 2. Zn shell by shell EXAFS fit data for UK feathers obtained from DLS I18.
| sample | path | CN | R(Å) | σ2 | ΔE0 (eV) | S02 |  |
R |
|---|---|---|---|---|---|---|---|---|
| Harris hawk eumelanised* | Zn-O | 4.1 | 2.01 (6) | 0.009 (1) | 4.142 ± 0.25 | 0.82 (2) | 24.85 | 0.012 |
| Zn-C | 0.9 | 2.71 (5) | 0.017 (14) | |||||
| Zn-Ca | 0.9 | 3.42 (3) | 0.011 (5) | |||||
| Zn-O | 2.1 | 3.84 (25) | 0.009 (1) | |||||
| Eurasian kestrel pheomelanised* | Zn-O | 3.0 | 2.02 (3) | 0.012 (1) | 0.283 ± 0.15 | 0.99 (2) | 87 | 0.007 |
| Zn-S | 0.8 | 2.29 (4) | 0.008 (4) | |||||
| Zn-C | 2.0 | 2.78 (13) | 0.019 (7) | |||||
| Zn-Zn | 1.2 | 3.34 (9) | 0.021 (10) | |||||
| Zn-O | 2.8 | 3.75 (11) | 0.017 (5) | |||||
| barn owl pheomelanised** | Zn-O | 3.3 | 2.01 (2) | 0.017 (2) | 4.59 ± 1.248 | 1.07 (17) | 5.37 | 0.008 |
| Zn-S | 1.0 | 2.30 (1) | 0.009 (4) | |||||
| Zn-Ca | 1.0 | 3.48 (2) | 0.008 (3) | |||||
| Harris hawk unmelanised** | Zn-O | 3.1 | 1.96 (2) | 0.012 (2) | −0.392 ± 1.621 | 0.98 | 16.58 | 0.013 |
| Zn-S | 1.5 | 2.26 (2) | 0.009 (3) | |||||
| Zn-Ca | 1.2 | 3.35 (4) | 0.011 (5) | |||||
| Zn eumelanin standard | Zn-O | 3.9 | 1.98 (3) | 0.012 (4) | −0.142 ± 2.066 | 1.02 (27) | 47.340 | 0.022 |
| Zn-C | 1.7 | 2.72 (5) | 0.016 (10) | |||||
| Zn-Zn | 1.5 | 3.26 (6) | 0.014 (6) |
Highlighted in underline bold is the distinct presence of sulfur within pheomelanised feathers. CN denotes coordination number; R(Å) denotes atomic distance; σ2 denotes Debye-Waller factor; ΔE0 denotes the shift in energy from the calculated Fermi level. S02 denotes the amplitude reduction factor; Xv2 denotes the reduced chi square value; R denotes the “good-ness of fit” factor. Numbers in parentheses are the 1σ error on the last decimal places. Errors on CN = 25%.
*Data obtained to k = 14.
**Low concentrations of zinc resulted in low signal to noise ratio.