Radar REMPI measurements of N2 rotational temperature Conference Paper uri icon

abstract

  • We report radar REMPI measurements of temperature using molecular nitrogen under atmospheric conditions. A 2+2 REMPI scheme was used to probe rotational transitions in the (v',v") = (1,0) vibrational band group X1Σg+→a1φgof the electronic manifold. A low power radar system was used to remotely detect the ionization produced. Under atmospheric conditions, the presence of a large interfering structure was observed when using linearly polarized light. The strength of this interfering structure was found to be both pressure and temperature dependent. At lower gas pressures, the strength of the interfering feature is reduced relative to the expected REMPI features. This structure could be eliminated by using circularly polarized light. Rotational spectra taken using circularly polarized light were obtained for three different gas temperatures. An analysis of the spectra yielded rotational temperatures in good agreement with thermocouple measurements.

author list (cited authors)

  • McGuire, S., & Miles, R. B.

publication date

  • January 2014