Knowledge Bank

To complete our infrared analyses of $\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}NH3$ between 5 and $8\mu$m, a region dominated by the absorption of the $2\nu 2$ overtone and $\nu 4$ fundamental bands, we have also modeled the $3\nu 2-\nu 2$ and $\nu 2+\nu 4-\nu 2$ hot band line positions and intensities measured at $0.005cm-1$ resolution with the Fourier transform spectrometer located at the Kitt Peak National Observatory. Using the $3\nu 2$ and $\nu 2+\nu 4$ upper states energy obtained $previously,a$ several hundred line positions with J up to 10 have been assigned to $3\nu 2(s)-\nu 2(a),3\nu 2(a)-\nu 2(s),\nu 2+\nu 4(s)-\nu 2(s)$ and $\nu 2+\nu 4(a)-\nu 2(a)$ located at 1416., 1963., 1608. and $1618.cm-1$ respectively. Selected intensity measurements have been modeled as well. Finally, comparisons of measured self-broadened line widths from these hot bands to corresponding values in the overtone and fundamental bands have revealed that the hot band line widths are smaller by factors of 0.8 to 0.4; these differences vary according to the quantum $numbers.b$