The temperature dependence of the quenching of Na-D-doublet by N2 and H2O in flames of 1500–2500 K

Abstract

The temperature dependence of the quenching cross section of the Na-D-doublet by N2 and H2O molecules has been measured in flames at temperatures from 1500 to 2500 K. The nitrogen and water cross sections are temperature independent. Their values were found to be σN2 = (22±2) Å2 and σH2O = (2.2±0.3) Å2. Our value of the nitrogen cross section is about half of the value measured at about 400 K in vapour bulbs. A possible explanation for this difference is given.