Research Article
Plasma Wind Tunnel Investigation of European Ablators in Nitrogen/Methane Using Emission Spectroscopy
Table 6
Electronic and vibrational transitions and corresponding band head wavelengths of the predominant molecular species.
| Species | Electronic transition | Vibrational transition | Wavelength/nm |
| | Σu → Σg | 1,1 0,0 | 388.4 391.4 |
| N2 | Πu → Πg | 3,6 2,5 1,4 | 389.5 394.3 399.8 |
| C2 Swan | Πg → Πu | 4,5 3,4 2,3 1,2 0,1 | 547.0 550.2 554.1 558.5 563.5 |
| CN Violet | Σ → Σ | 0,0 1,1 2,2 3,3 4,4 3,2 2,1 1,0 | 388.3 387.1 386.2 385.5 385.1 358.4 358.6 359.0 |
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