Appendix
Physical Constants in SI
A.1 Ionization potentials
| Xenon | 12.13 eV |
| Helium | 24.59 eV |
| Argon | 15.76 eV |
| Nitrogen | 14.53 eV |
A.2 Work function
| Material | Work Function (eV) |
| Al | 4.25 |
| C | 4.7 |
| Cu | 4.4 |
| Mo | 4.3 |
| Ni | 4.5 |
| W | 4.54 |
| LaB6 | 2.3–2.4 |
A.3 Ion-induced secondary emission coefficients [1]
A.3.1 Glow discharge
A.3.1.1 Normal cathode fall in various gases
A.3.1.2 A, B coefficients in equation for breakdown voltage
| A | B | |
| Air | 14.6 | 365 |
| Ar | 13.6 | 235 |
| H2 | 5 | 130 |
| H2O | 12.9 | 289 |
| He | 2.8 | 34 |
A.4 Vacuum arcs
Table A.1
Ion velocity, ...
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