Knowledge Bank

A rotational and vibrational analysis has been made of the ND$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ $A~2A1$-$X~2B1$ emission spectrum produced from the ultraviolet laser induced dissociation of both jet cooled and room temperature deuterated ammonia, ND$\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$, and di-deutero ammonia, ND$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$H. The pattern of the strong features in the emission spectra is very different in the fragmentation of ND$\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$ and ND$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$H, with a much wider range of angular momentum states being observed from the photolysis of the predissociative state of the unsymmetrical parent ND$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$H. The analysis is based upon the earlier studies of the electronic spectrum of ND$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$, and model calculation based upon the stretch-bender Renner-Teller Hamiltonian. The spectra consist of two types, transitions from a narrow distribution of high angular momentum states in the photolysis of ND$\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$ and ND$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$H, and in the photolysis of ND$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$H strong emission from threshold states to three high energy regions of the $X~2B1$ state. The threshold states are in the third bending level, v2=3, of the ND$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ $A~2A1$ state, and have no angular momentum about the axis of least moment of inertia, Ka = 0.