Laser-Induced Optical Breakdown in Methane: Diagnostic Using H-Gamma Line Broadening

Table 4

Deduced 𝑁_𝑒 for pressure of 2.7×10⁵ Pa.

𝑡delay [𝜇s]	𝐻𝛼	𝐻𝛽	𝐻𝛾
	𝑁𝑒 [10^17 cm^-3]	𝑁𝑒 [10^17 cm^-3]	𝑁𝑒 [10^17 cm^-3]
0.4	5.0 ± 0.4	2.9 ± 0.8	2.6 ± 0.7
0.5	3.8 ± 0.4	2.5 ± 0.7	2.5 ± 0.7
0.6	3.0 ± 0.4	2.2 ± 0.6	1.9 ± 0.5
0.7	2.5 ± 0.4	1.9 ± 0.5	1.7 ± 0.5
0.8	2.1 ± 0.3	1.6 ± 0.4	1.5 ± 0.5
0.9	1.9 ± 0.3	1.4 ± 0.4	1.3 ± 0.4
1.0	1.6 ± 0.3	1.3 ± 0.4	1.2 ± 0.4
1.1	1.4 ± 0.2	1.2 ± 0.3	1.1 ± 0.25
1.2	1.3 ± 0.2	1.1 ± 0.3	1.05 ± 0.25
1.3	1.15 ± 0.2	1.0 ± 0.3	1.0 ± 0.28
1.4	1.0 ± 0.2	0.87 ± 0.3	0.95 ± 0.28
1.5	1.0 ± 0.2	0.79 ± 0.3	0.92 ± 0.28
1.6	0.90 ± 0.2	0.76 ± 0.2	0.90 ± 0.28
1.7	0.84 ± 0.1	0.75 ± 0.2	0.90 ± 0.29
1.8	0.72 ± 0.1	0.68 ± 0.2	0.90 ± 0.29
1.9	0.69 ± 0.1	0.60 ± 0.2	0.90 ± 0.29
2.0	0.63 ± 0.1	0.55 ± 0.2	0.80 ± 0.30
2.1	0.58 ± 0.1	0.50 ± 0.2	0.77 ± 0.29