Table 1.
Peak energies of the first-order X-ray resonance lines for S species (compilation of literature data)
| S form | Example | Peak energies eV (Reference number) |
|||
|---|---|---|---|---|---|
| (27) | (37) | (38) | |||
| Elemental S | So | 2472.5 | 2472.5 | ||
| Organic polysulfide | R-S-S-S-R′ | 2473 | |||
| Organic disulfide | R-S-S-R′ | Cystine | 2472.8 | 2473 | 2472 |
| Thiols | R-SH | Cysteine | 2473.5 | 2473.5 | |
| Organic monosulfides | R-S-R′ | Methionine | 2473.1 | 2473.5 | 2473.5 |
| Sulfoxide | R-S=O | Methionine sulfoxide | 2476 | 2476 | |
| Ester sulfate | R-O-SO3 | Chondroitin sulfate | 2482.5 | 2483.5 | 2482 |
| Inorganic sulfate | SO42− | Sodium sulfate | 2482.5 | 2483.5 | 2483 |
Peak energies of the first-order x-ray resonance lines for S-containing compounds vary in the range between 2469 and 2483 eV. The absolute peak energy values for distinct sulfur species obtained by other researchers differ slightly from one another.