Research Article
Analysis of Carbon Contents and Heavy Metals in Coal Samples Using Calibration-free LIBS Technique
Table 1
Plasma temperature and electron number densities of the coal samples.
| Coal samples | Temperature (K) | Electron number density (cm-3) (×1017) |
| Chinese | 8300 ± 400 | 2.84 ± 0.8 | Lakhra | 8500 ± 600 | 3.01 ± 0.7 | Duki | 8200 ± 500 | 2.33 ± 0.9 | Makerwal | 8800 ± 600 | 2.41 ± 0.7 | Thar | 7900 ± 500 | 2.17 ± 0.6 |
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