Abstract
The reaction of Mg atoms with N2O has been studied in steady-state conditions, by the laser induced fluorescence technique and the chemiluminescence spectrum analysis. Mg atoms are produced in a Broida-type apparatus. Experimental evidence is presented which shows that both Mg(3s3p3P) and Mg(3s3p1P) excited states reacts with N2O whereas the ground Mg(3s2 1S) state does not. Mg(3s3p3P) atoms produced in the oven are also responsible for the formation at Mg(3s3p1P) in the afterglow, through triplet–triplet annihilation. Chemiluminescence is partly due to the direct reaction of Mg 1P with N2O and partly due to secondary reactions. The kinetic behavior of reactants and products is studied and modeled. Absolute cross sections for quenching of Mg(3s3p3P) and Mg(3s3p1P) by N2O, and for the state-to-state reactions of Mg(3P)+Mg(3P)→Mg(1P)+Mg(1S) and Mg(1P)+N2O→MgO(B 1Σ+)+N2 have been measured. Rotational and vibrational temperatures of the B 1Σ+ state of MgO have been calculated via simulation of the chemiluminescence spectra.
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