Thermometry in air by optically exciting the I{sub}2 Cordes bands

摘要

An optical method is described to perform instantaneous thermometry along a line in low-density air seeded with I{sub}2. Laser-induced fluorescence is generated by exciting the I{sub}2 Cordes bands (D 1{sup left}((Σ{sub}u){sup}+)←X 1{sup left}((Σ{sub}g){sup}-)) with a tunable ArF excimer laser near 193 nm. Temperatures from 295 to 648 K are measured by fitting the 12 emission spectrum from 188 to 195 nm to a vibrational Boltzmann distribution. Uncertainties for average measurements are typically ±5% (±1σ).