Measurement of N2+ Mobility in He VIA Fourier Transform Emission Spectroscopy.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Recently, Hong and Miller used Fourier Transform Emission FTE spectroscopy to determine the N2 mobility in helium by relating the observed Doppler shift of the N2 B-X transition to the measured electric field in the discharge as determined by probes. In order to establish the technique in-house, this effort duplicated that experiment and investigated the sensitivity and utility of the method. Doppler shift measurements in this experiment disagreed significantly with those reported by Hong and Miller. Attempts to reduce the data and thus determine the mobility using a model developed by Hong and Miller were unsuccessful. The model did not qualitatively or quantitatively describe the Doppler shifts observed in this work. At this time, an explanation of the differences between the two experiments is not known. Possibilities include effects of striations on the Doppler shift measurements, competition between one- and two-step excitation of the N2 B-X state, and failure to interpret the Hong and Miller model correctly. Subsequent attempts to model Hong and Millers own data taken from their figures yielded mobility parameters which disagreed with their published results.
- Physical Chemistry
- Atomic and Molecular Physics and Spectroscopy