Abstract
A reinvestigation of the radiative lifetimes and the quenching rate constants of single excited rotational states (N,Fj,e/f ) (j=1–3) of the NH(A 3Π,v=0) radical has been performed. The quenching species was the parent molecule NH3. The electronically excited NH(A 3Π) radicals are generated by first forming ground state NH(X 3Σ−) in the ArF laser photolysis of NH3; after a delay, NH(X 3Σ−) is pumped by a dye laser to selected fine structure levels of the A 3Π state. Both the radiative lifetimes and quenching rate constants were found to be dependent on the rotational level but not on the spin and Λ-doublet component. The formation of a blast wave was observed under certain conditions leading to time dependent changes of the number density and temperature in the system. In case of a blast wave, kinetic measurements have to be evaluated with great care.
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