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In this work, the temporal decay of electrons produced by an atmosphericpin-to-pin nanosecond discharge operating in the spark regime was measured viaa combination of microwave Rayleigh scattering (MRS) and laser Rayleighscattering (LRS). Due to the initial energy deposition of the nanosecond pulse,a variance in local gas density occurs on the timescale of electron decay.Thus, the assumption of a constant collisional frequency is no longerapplicable when electron number data is extracted from the MRS measurements. Torecalibrate the MRS measurements throughout the electron decay period,temporally-resolved LRS measurements of the local gas density were performedover the event duration. Local gas density was measured to be 30% of theambient level during the later stages of electron decay and recovers at about 1ms after the discharge. A shock front traveling approximately 500 m/s wasadditionally observed. Coupled with plasma volume calibration viatemporally-resolved ICCD imaging, the corrected decay curves of the electronnumber and electron number density are presented with a measured peak electronnumber density of 4.5*10^15 cm^-3 and decay rate of ~ 0.1-0.35*10^7 s^-1. Ahybrid MRS and LRS diagnostic technique can be applied for a broad spectrum ofatmospheric-pressure microplasmas where a variation in number gas density isexpected due to an energy deposition in the discharge.

Combined Microwave and Laser Rayleigh Scattering Diagnostics for Pin-to-Pin Nanosecond Discharges