Table 1
Spectroscopic parameters corresponding to the observed lines.
| H2 line | λul (µm) | Aul (s−1) | 𝑔up | Eup (K) |
|---|---|---|---|---|
| S(0) [LH] | 28.219 | 2.9493 × 10−11 | 5 | 509.85 |
| S(1) [SH] | 17.035 | 4.7716 × 10−10 | 21 | 1015.2 |
| S(2) [SH, SL] | 12.278 | 2.7607 × 10−9 | 9 | 1681.7 |
| S(3) [SL] | 9.6645 | 9.8574 × 10−9 | 33 | 2503.9 |
| S(4) [SL] | 8.0255 | 2.6489 × 10−8 | 13 | 3474.4 |
| S(5) [SL] | 6.9089 | 5.8923 × 10−8 | 45 | 4586.4 |
| S(6) [SL] | 6.1086 | 1.1444 × 10−7 | 17 | 5829.8 |
| S(7) [SL] | 5.5112 | 2.0058 × 10−7 | 57 | 7197.0 |
Notes. The Spitzer/IRS modules used for the observations of each line are indicated within brackets. The terms λul and Aul are respectively the wavelength and the Einstein coefficient of the pure rotational transition (υ = 0, where υ is the vibrational quantum number). Eup and 𝑔up are respectively the energy and degeneracy corresponding to the upper level. The values given are taken from the Cologne Database for Molecular Spectroscopy (Müller et al. 2001, 2005; Endres et al. 2016) and the Jet Propulsion Laboratory database (Pickett et al. 1998) and are the numeric values used in this work.
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