Knowledge Bank

The $\upsilon 2$ band of $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}NH3$ in the $927-1087cm-1$ region has been studied by using a tunable diode laser. Spectra were recorded using a two-channel system in which one part of the diode laser radiation passed through the gaseous sample while another part was simultaneously mixed with radiation from a $CO2$ laser. Using this technique, lines within $\pm 8GHz$ of a $CO2$ laser line have been measured to an accuracy of 13 MHz. Lines in both the antisymmetric-to-symmetric and symmetric-to-antisymmetric portions of the $\upsilon 2$ band have been measured and assigned. Other lines, probably associated with the $2\upsilon 2-\upsilon 2$ band of $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}NH3$, have been measured.