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
N2^+	B^2Σu → X^2Σg	1,1; 0,0	388.4; 391.4
N2	C^3Πu → B3Πg	3,6; 2,5; 1,4	389.5; 394.3; 399.8
C2 Swan	d^3Πg → a^3Πu	4,5; 3,4; 2,3; 1,2; 0,1	547.0; 550.2; 554.1; 558.5; 563.5
CN Violet	B^2Σ → X^2Σ	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