Knowledge Bank

The Fourier transform spectra of ammonia, $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}NH3$, have been measured in the 2-3 im region with $0.005cm-1$ resolution. The $\nu 1,\nu 3,2\nu 4,\nu 1+\nu 2+\nu 3$, and $\nu 2+2\nu 4$ bands have been assigned and analyzed. Among them, the $\nu 2+\nu 2$ bands have been assigned for the first time. The band origins for the $\nu 2+2\nu 4$ symmetrical and antisymmetrical parallel bands are $4115.62cm-1$ and $4173.25cm-1$ respectively. These band origins differ from the calculated values (1). The band origins for the symmetrical antisymmetrical perpendicular bands are also found at $4135.94cm-1$ and $4193.14cm-1$ respectively.