Table 2.
Molecular properties for the species with computed opacities presented in this work for which H2 and He broadening parameters are available in the literature, the majority of which were collated by Barton et al. (2017a).
| Species | γH2 | nH2 | γHe | nHe | DM | MM | AN | Structure | Dipole Ref |
|---|---|---|---|---|---|---|---|---|---|
| (d) | (g mol−1) | ||||||||
| H2 | 0.01 | 0.13 | 0.01 | 0.13 | 0 | 2.0 | 2 | Nonpolar | Johnson-III (2019) |
| CH4 | 0.06 | 0.60 | 0.03 | 0.30 | 0 | 16.0 | 10 | Nonpolar | |
| C2H2 | 0.09 | 0.59 | 0.04 | 0.44 | 0 | 26.0 | 14 | Linear | |
| CO | 0.07 | 0.65 | 0.05 | 0.60 | 0.1 | 28.0 | 14 | Diatomic | Johnson-III (2019) |
| PH3 | 0.10 | 0.75 | 0.05 | 0.30 | 0.6 | 34.0 | 18 | Non-linear | |
| OCS | 0.05 | 0.75 | 0.04 | 0.75 | 0.7 | 60.1 | 30 | Linear | Dijkerman & Ruitenberg (1969) |
| HCl | 0.03 | 0.75 | 0.01 | 0.75 | 1.1 | 36.5 | 18 | Diatomic | Johnson-III (2019) |
| NH3 | 0.08 | 0.50 | 0.03 | 0.50 | 1.5 | 17.0 | 10 | Non-linear | |
| SO2 | 0.14 | 0.75 | 0.07 | 0.64 | 1.6 | 64.1 | 32 | Non-linear | |
| H2O | 0.06 | 0.20 | 0.01 | 0.13 | 1.9 | 18.0 | 10 | Non-linear | |
| HF | 0.04 | 0.75 | 0.01 | 0.50 | 1.9 | 20.0 | 10 | Diatomic | Johnson-III (2019) |
| H2CO | 0.14 | 0.50 | 0.06 | 0.50 | 2.3 | 30.0 | 16 | Non-linear | |
| HCN | 0.12 | 0.50 | 0.05 | 0.50 | 3.0 | 27.0 | 14 | Linear | Tomasevich (1970) |
Notes. γx and nx (where x = H or He) are the broadening parameters for hydrogen and helium (γ0 and nL in Eq. (4)). DM is the dipole moment, MM is the molar mass, and AN is the atomic number. The citations for the H2/He broadening parameters are given below the table for each molecule. An average value for all values of J is taken for each set of broadening parameters. The reference temperature of T0 = 296 K is used in all cases.
References. H2: Wcisło et al. (2016). CH4: Varanasi & Chudamani (1990), Pine (1992), Fox et al. (1998), Varanasi & Tejwani (1972), Varanasi & Chudamani (1989), Grigoriev et al. (2001), Gabard et al. (2004), Manne et al. (2017), Gharib-Nezhad et al. (2019) C2H2, OCS, NH3, SO2, HF: Wilzewski et al. (2016) HCl: Wilzewski et al. (2016), Li et al. (2018) CO: Faure et al. (2013), Li et al. (2015), Mulvihill et al. (2018), Mantz et al. (2005), Predoi-Cross et al. (2016), Sinclair et al. (1998) PH3: Kleiner et al. (2003), Levy et al. (1993), Sergent-Rozey et al. (1988), Salem et al. (2004, 2005) H2O: Voronin et al. (2010, 2012), Barton et al. (2017b), Solodov & Starikov (2008, 2009), Petrova et al. (2013, 2012, 2016), Gamache et al. (2019) H2CO: Nerf (1975) HCN: Mehrotra et al. (1985), Cohen & Wilson (1973), Charron et al. (1980).
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