Knowledge Bank

Line positions, intensities and line shape parameters are reported for four bands of phosphine between 2150 and 2400 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ in order to improve the spectroscopic database for remote sensing of the giant planets. Knowledge of PH$3$ in this spectral region is important for Cassini/VIMS exploration of dynamics and chemistry on Saturn, as well as for interpreting the near-IR data from Juno and ESA's proposed Jupiter mission. For this study, five high-resolution (0.0023 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$), high signal-to-noise (>2000) spectra of pure PH$3$ were recorded at room temperature (298.2 K) with the Bruker IFS 125HR Fourier transform spectrometer at Pacific Northwest National Laboratory. Individual line parameters were retrieved by multispectrum fitting nderline{\textbf{53}} (1995) 705-721.} of all five spectra simultaneously. Positions and intensities were measured for over 3100 transitions. The rotational quantum numbers of measured lines go as high as $J\prime \prime =16$ and $K\prime \prime =15$ in the $\nu 3$ and $\nu 1$ bands; some lines of the weaker bands $2\nu 4$ and $\nu 2+\nu 4$ are also reported. The measured positions and intensities are compared to new theoretical calculations of the pentad. Lorentz self-broadened width and pressure-induced shift coefficients of many transitions were also obtained, along with speed dependence parameters. Line mixing coefficients were determined for several $A+A-$ pairs of transitions for $K\prime \prime =3,6$, and $9$.