Table 1
Summary of the p–H2CO transitions observed in this study.
| Transition p–H2CO | Frequency (GHz) | Eu (K) | Receiver | HPBW (″) | Detection rate (%) |
|---|---|---|---|---|---|
| 30,3–20,2 | 218.222 | 20.96 | nFLASH230 | 27.63 | 100 (61/61) |
| 32,2–22,1 | 218.476 | 68.09 | nFLASH230 | 27.60 | 85 (51/61) |
| 32,1–22,0 | 218.760 | 68.11 | nFLASH230 | 27.56 | 86 (52/61) |
| 40,4–30,3 | 290.623 | 34.90 | SEPIA345 | 20.75 | 98 (60/61) |
| 42,3–32,2 | 291.237 | 82.07 | SEPIA345 | 20.70 | 83 (51/61) |
| 42,2–32,1 | 291.948 | 82.12 | SEPIA345 | 20.65 | 85 (52/61) |
Notes. The columns are from left to right: The spectral line transitions studied, their rest frequencies, upper level energies, Eu, the receiver used, its Half Power Beam-width (HPBW) and the detection rate (i.e., above 3σ of rms noise of 15–20 mK). The frequencies and spectral line parameters are taken from the Cologne Database for Molecular Spectroscopy (CDMS; Müller et al. 2001, 2005; Endres et al. 2016).
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