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Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

Fig. 6.

Fig. 7.

Fig. 8.

Fig. 9.

Fig. 10.

Fig. 11.

Fig. 12.

Fig. 13.

Fig. 14.

Fig. 15.

Results of multiple executions with diffrent neutral gas (Ar) pressures and the resultants frequency shift measured

Pressure injection (Pa)	f (MHz)	Δf (MHz)	ne (×1014 m−3)
8	3563.6	–	–
10	3573.6	10.0	8.8
12	3580.8	17.2	15.2
13	3584.8	21.2	18.7
16	3586.4	22.8	20.2
18	3584.4	20.8	18.3
20	3582.5	18.9	16.7
21	3580.0	16.4	14.4
25	3578.4	14.8	13.1
28	3574.5	10.9	9.6
34	3572.8	9.2	8.1
44	3570.0	6.4	5.7
48	3568.8	5.2	4.6
60	3567.2	3.6	3.2
98	3566.8	3.2	2.8
120	3566.8	3.2	2.8

Results of multiple executions with different neutral gas pressure (Ar) and results for the ion saturation current, and the respective calculation of the speed of sound and the density

Pressure (Pa)	(μgA)isat+$$\mathop {\left( {{\rm{\mu gA}}} \right)}\limits^{i_{{\rm{sat}}}^ + } $$	Te (eV)	Cs (m/s)	n (×1015 m−3)
64	−15.2	4.8	3405	8.9
100	−14.2	6.3	3901	7.2
150	−12.7	5.7	3711	6.8

Parameters obtained after the fitting shown in Fig_ 9, the ion saturation current

Slope	α(1/V)	Vf (V)	isat+(μA)$i_{sat}^ + {\rm{ }}\left( {{\rm{\mu A}}} \right)$
1	0.96	12.38	−17.2
−1	0.49	35.33	−17.6