Diagnosis of iso-octane combustion in a shock tube by emission spectroscopy

► The rotational temperatures are in good agreement with the calculated flame temperatures. ► The emission intensity ratios of OH∗/CH∗ and C2∗/OH∗ are sensitive to the equivalence ratio. ► Ignition delay times provide a database to validate the kinetic mechanism. ► Emission spectrum can be used as a good indicator in combustion systems.