Knowledge Bank

High-resolution spectra of the $1.6-\mu m$ region of $CH3D$ in ambient atmospheres of $N2$ have been recorded with the Fourier Transform Spectrometer at Kitt Peak National Observatory (KPNO) Nitrogen pressures ranged from 100 to 500 torr. The total $CH3D$ abundance was 0.243 m-amagats a partial pressure of 10 torr. All spectra were recorded at room temperature. Reductions are being carried out using a spectral-fitting routine developed by J. Brault KPNO which fits Voigt profiles to the spectral lines. Up to 66 consecutive absorption lines to be treated in an iterative least-squares algorithm in which each line is characterized by position, its peak absorption coefficient, the halfwidths of the absorption coefficient, and Gaussian and Lorentz components. Preliminary line strengths, Lorentz widths, and pressure shift have been determined for a number of rotational fine-structure lines of the $3\nu 2$ band, and systematic dependences of the pressure width and shifts of both J and K have been found. This research has been supported by NASA Grant NSG-7499.