Measurements of Rovibrational Temperatures Derived from N2 (1+) and N2 (2+) behind Shock Waves

摘要

To influence of electronic state on rovibrational temperatures spectroscopic measurement is conducted using a free-piston double diaphragm shock tube. Emission spectrum of N2(l+) and N2(2+) system are obtained in this measurement. Rovibtational temperatures are derived from measured spectra and finally spatial distribution of rovibrational temperatures is obtained. The measured rotational temperatures are nonequilibrium with the translational temperature. The rotational temperatures derived from N2(l+) and N2(2+) are almost same. The vibrational temperature derived from N2(2+) is lower than that of N2(l+). From the spatial distribution of vibrational temperature, relaxation of vibrational temperature derived from N2(2+) looks slower.