Table 2
Observable transitions of H216O covered by the ATOMIUM program.
| Line number | v(a) (MHz) | Unc.(a) (MHz) | QNvib(b) | QNrot(c) | Sp(d) | Eup(e) (cm−1)(K) | A (×10−6 s−1)(f) | ndet.(g) | Reference(h) |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 222014.12 | 4.53 | (0,3,0)–(0,3,0) | 83,6−74,3 | o | 5790.1 | 15.6 | W2020 | |
| 222017.31 | 1.50 | 8331 | 8 | TW | |||||
| 2 | 227780.09 | 0.29 | (1,0,0)–(0,2,0) | 70,7−83,6 | o | 4232.2 | 0.003 | 0 | JPL |
| 6089 | |||||||||
| 3 | 230191.53 | 0.53 | (0,0,1)–(0,2,0) | 83,5−95,4 | o | 4792.3 | 0.03 | 0 | JPL |
| 6895 | |||||||||
| 4 | 236805.40 | 1.82 | (0,0,1)–(0,0,1) | 143,12−134,9 | p | 6263.9 | 2.11 | JPL | |
| 236797.0(i) | 2.00 | 9012 | 1 (i) | TW | |||||
| 5 | 244330.37 | 3.44 | (1,1,0)–(0,1,1) | 42,2−32,1 | p | 5557.9 | 4.84 | W2020 | |
| abso.(j) | 7997 | 4(j) | TW | ||||||
| 6 | 252172.25 | 0.38 | (1,0,0)–(0,2,0) | 74,3−85,4 | o | 4572.4 | 0.55 | JPL | |
| 252170.56 | 2.00 | 6579 | 8 | TW | |||||
| 7 | 254039.88 | 0.15 | (0,0,1)–(0,0,1) | 31,3−22,0 | o | 3895.6 | 9.55 | JPL, P1995 | |
| 254039.75 | 2.00 | 5605 | 9 | TW | |||||
| 8 | 254052.55 | 3.42 | (0,2,0)–(0,2,0) | 143,12−134,9 | o | 5790.4 | 6.76 | JPL | |
| 254055.18 | 2.00 | 8331 | 6 | TW | |||||
| 9 | 254234.65 | 3.00 | (0,1,1)–(1,1,0) | 73,4−65,1 | p | 6179.8 | 2.06 | W2020 | |
| 8891 | 2?(k) | ||||||||
| 10 | 259952.18 | 0.20 | (0,0,0)–(0,0,0) | 136,8−143,11 | p | 2748.1 | 3.24 | JPL, A1991 | |
| 259951.87 | 2.00 | 3954 | 10 | TW | |||||
| 11 | 262555.55 | 1.42 | (0,2,0)–(1,0,0) | 107,3−114,8 | p | 5473.8 | 0.09 | 0 | JPL |
| 7876 | |||||||||
| 12 | 262897.75 | 0.15 | (0,1,0)–(0,1,0) | 77,1−86,2 | p | 3109.9 | 3.97 | JPL, P1991 | |
| 262897.87 | 1.50 | 4475 | 12 | TW | |||||
| 13 | 266574.10 | 1.85 | (0,0,0)–(0,0,0) | 214,17−207,14 | o | 5748.1 | 4.32 | JPL | |
| 266567.52 | 2.00 | 8270 | 7 | TW | |||||
| 14 | 268149.12 | 0.15 | (0,2,0)–(0,2,0) | 65,2−74,3 | o | 4197.3 | 15.3 | JPL, P1991 | |
| 268148.51 | 1.50 | 6039 | 15 | TW |
Notes. (a)Transition frequency and uncertainty for the given line number: first entry is from the reference given in the last column; second entry is the frequency determination in this work (TW in last column) from observed spectra (see Sect. 3.2). No second entry means no detection. Uncertainty refers to: JPL laboratory measurements or calculations (first entry) and to our own estimates from this work (second entry). (b)Vibrational quantum number: (
,
,
)−(
,
,
). (c)Rotational quantum number: 
−
. (d)Spin modification: ortho or para H2O. (e)Upper state energy in cm−1 and K (italics below cm−1).(f)Spontaneous emission rate from the HITRAN data base (https://lweb.cfa.harvard.edu/HITRAN/) except for line 3 where it is not available; uncertainty is larger for transitions between different vibrational states because of limited wavenumber precision in data base. Spontaneous emission rate in line 3 is taken from https://splatalogue.online/ from which line strengths (Sμ2 in D2) can also be retrieved for most lines listed here. (g)Number of ATOMIUM sources detected in H2O transition. (h)JPL catalog (Pickett et al. 1998), W2020 (Furtenbacher et al. 2020), P1991 (Pearson et al. 1991), P1995 (Pearson 1995), A1991 (Amano & Scappini 1991), TW (this Work). (i)Transition identified in R Hya only (uncertain identification in S Pav) and rest frequency derived from extended array data. See R Hya combined array spectra in Appendix C. (j)244.330 GHz line absorption observed in R Hya, S Pav, R Aql and IRC+10211 (Sect. 4.4.).(k)Uncertain identification of line 9 near strong υ = 0 30SiO line wing in AH Sco and VX Sgr (see spectra and discussion in Appendix C).
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