Table 2
Recommended charge-changing cross-section polynomial fits for (H+, H0, H−) projectiles colliding with H2O vapor.
| Cross section | Degree | Coefficients | Validity range | Confidence | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| (m2) | n | p0 | p1 | p2 | p3 | p4 | p5 | p6 | vi (km s−1) | Ei (keV u−1) | |
| σ10 | 6 | 33151.6652 | − 34755.9561 | 15090.7461 | − 3475.4246 | 447.74484 | −30.59282 | 0.865965 | 100–20 000 | 0.05–2100 | High |
| σ1−1 | 6 | 23065.9322 | − 25763.6624 | 11868.1014 | − 2890.6324 | 392.69112 | −28.20982 | 0.837012 | 100–7600 | 0.05–300 | Low |
| σ01 | 4 | 332.2201 | − 247.4856 | 62.7381 | − 6.8495 | 0.27305 | – | – | 150–20 000 | 0.10–2100 | Medium |
| σ0−1 | 5 | − 1446.6760 | 1267.4240 | − 450.7229 | 79.8827 | − 7.03258 | 0.24532 | – | 100–4500 | 0.05–105 | Low |
| σ−11 | 4 | − 121.2559 | 79.1328 | − 23.9740 | 3.2444 | − 0.16311 | – | – | 650–7600 | 2.20–300 | Low |
| σ−10 | 5 | 403.3783 | − 383.3741 | 137.3481 | − 24.3561 | 2.14359 | −0.07510 | – | 100–20 000 | 0.05–2100 | Low |
Notes. The polynomial, function of the speed of the impactor, is of the form 
, where n is the degree of the fit, the speed vi is expressed in m s−1 and the cross sections σ in m2. Ranges of validity for impact speeds and energies are given. Confidence levels on the fits are indicated as high (< 25%), medium (25– 75%), and low (>75%; see text).
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