Investigation of a Molecular Plasma From Its Acoustic Response

In developing a pulsed microwave lamp of 1 kW, fitted with static electrodeless spherical bulb glass, we discovered phenomenon in which the plasma forms ball at bulb's center, despite effect gravity. The light is produced by sulfur, so hot that it might melt if remained contact although fused quartz. preceding publication, reported on photometric measurements showing response to modulation microwaves. We have shown formation results from an acoustic resonance mode. From measurement frequency, assessed average value pressure inside bulb. has been reproduced another team researchers similar setup but spinning order stabilize ball. oscillations diameter, they amplitude can reach 180 dB (re20 μPa). our setup, not measured this feature. However, improving model modulation, also able assess amplitude, and found agreement, as article. addition, analysis suggests stimulated emission involved observed fast time scale emission.