Abstract
Spatially resolved temperature measurements within a microdischarge in atmospheric pressure air have been conducted using Rayleigh scattering of a pulsed ultraviolet laser. Rayleigh scatter images were used to generate highly resolved 1D and 2D profiles of translational temperature, with the analysis based on the ideal gas inverse relationship between temperature and gas density. The technique was shown to be practical to an upper gas temperature limit of approximately 2000 K. Rayleigh scattering results were compared to standard optical emission spectral analyses of bands, where the calculated rotational temperatures from emission agreed consistently with the peak translational temperatures within the microdischarge measured by Rayleigh laser scatter analyses. The results provide distinctive support of the assumption commonly applied for discharges that the excited state has an identical rotational energy distribution as the ground state. The microdischarge investigated in this study was found to follow another common assumption for non-thermal discharges; that the translation and rotational temperatures are approximately equal to each other and the vibrational temperature is of a much higher value.
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