O_2 rotational-resolved spectral modelling and temperature measurements based on C~3Π_g←←X~3∑_g transitions

摘要

A rotational-resolved spectral model has been developed and applied for the temperature measurements based on the O_2 two-photon C~3Π_g(v' = 2)←←X~3∑_g~-(v" = 0) transition. The model offers a wide temperature measurement range (5 K-1300 K) in ambient air. The experimental spectra of O_2 based on 2+1 REMPI process have been applied for the whole spectral fitting and temperature extracting with the application of the O_2 REMPI spectral model providing an overall difference of less than ± 10% compared to the temperature measurements of thermal couple. Compare to previous temperature analysis technique, such model is an improvement with higher accuracy engaging the whole spectral structures of two-photon C~3Π_g(v' = 2)←←X~3∑_g~-(v" = 0) transition and here we present that it is the first time to develop the spectral model and conduct the whole spectral fitting in the O_2 rotational temperature measurement.