State-resolved radiative lifetimes of the NH(A [sup 3]Π,v=0) radical and rate constants for the quenching by NH[sub 3]

Hake, A.; Stuhl, F.
August 2002
Journal of Chemical Physics;8/8/2002, Vol. 117 Issue 6, p2513
Academic Journal
A reinvestigation of the radiative lifetimes and the quenching rate constants of single excited rotational states (N, F[sub j],e/f) (j=1-3) of the NH(A ³,Π=0) radical has been performed. The quenching species was the parent molecule NH[sub 3]. The electronically excited NH(A ³Π) radicals are generated by first forming ground state NH(X ³Σ[sup -]) in the ArF laser photolysis of NH[sub 3]; after a delay, NH(X³Σ[sup -]) is pumped by a dye laser to selected fine structure levels of the A ΣΠ 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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