LINE PARAMETERS OF THE PH$_3$ PENTAD IN THE $4-5 \mu$m REGION
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Date
2012
Journal Title
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Publisher
Ohio State University
Abstract
Line positions, intensities and line shape parameters are reported for four bands of phosphine between 2150 and 2400 cm$^{-1}$ 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$^{-1}$), 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 $9$.
Description
Author Institution: The College of William and Mary, Williamsburg, VA 23187; Laboratoire Interuniversitaire des Systemes Atmospheriques (LISA), UMR 7583 CNRS/IPSL-Universites; Paris-ESt and Diderot, 94010 Creteil Cedex, France; Pacific Northwest National Laboratory, Richland, WA 99352; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109; Department of Physics, University of Oxford, Clarendon Laboratory, Oxford, OX1 3PU, UK