Table 2. Physical properties of the different gases used at the HPMX laboratory.
Missing values (—) are either inaccessible or not used. Xenon and nitrogen pressure systems are available but these gases are not yet in demand at the HPMX.
| Gas | He | Ar | Kr | Xe | O2 | CO2 | CH4 | N2 |
|---|---|---|---|---|---|---|---|---|
| Polar property | Nonpolar, inert | Quadrupole moment, reactive | ||||||
| Polarizability (Å3) | 0.2 | 1.6 | 2.5 | 4.0 | 1.6 | 2.5 | 2.4 | 1.7 |
| X-ray beam energy (keV) | — | 6 | 14.3 | 6 | — | — | — | — |
| Anomalous f′′ (e−) | — | 1.5 | 3.8 | 11.6 | — | — | — | — |
| Solubility (mM bar−1) | 0.4 | 1.4 | 2.5 | 4.3 | 1.3 | 35 | 1.4 | 0.6 |
| Kinetic diameter (Å) | 2.6 | 3.4 | 3.6 | 4.0 | 3.5 | 3.3 | 3.8 | 3.6 |
| Icing temperature (K) | 2.2 | 84 | 116 | 161 | 54 | 195 | 91 | 63 |
| Maximum pressure at HPMX (bar) | 2000 | 2000 | 500 | — | 70 | 57 | 50 | — |