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Table 2

Observed ammonia transitions toward G34.3+0.15 with Herschel-HIFI.

Transition Frequencya E l b E u c A ul d n crit e g l / g u f HPBW g η mb h T C i 1σ/TCj
(JK,ϵ) (GHz) (K) (K) log 10(s-1) (cm-3) () (K) (%)

o-NH3 10 +–00 + 572.498 0 27 2.802 3.4e7 4/12 36 0.62 0.86 3.0
20 +–10 + 1214.853 27 86 1.742 3.1e8 12/20 17 0.61 4.35 2.4
30 +20 + 1763.524 86 170 1.226 1.1e9 20/28 12 0.60 6.60 1.1

p-NH3 21 −–11 − 1168.452 23 79 1.918 3.1e8 6/10 18 0.61 4.50 1.5
21 +–11 + 1215.246 22 80 1.867 3.5e8 6/10 17 0.61 4.37 2.4
31 +–21 + 1763.601 80 165 1.277 1.2e9 10/14 12 0.60 6.60 1.1
32 +–22 + 1763.823 64 149 1.482 9.3e8 10/14 12 0.60 6.60 1.1

Notes. All spectroscopic data are taken from JPL. . .

(a)

The highest error in frequency is 0.1 MHz for the 1764 GHz lines.

(b)

Lower state energies.

(c)

Upper state energies.

(d)

The Einstein coefficient for spontaneous emission Aul.

(e)

Critical density, Aul/Cul, where Cul is the collision coefficient evaluated for 50 K.

(f)

Ratio of lower and upper state degeneracies.

(g)

The Herschel half power beam width at respective frequency (Mueller et al. 2014)

(h)

The main beam efficiency (Mueller et al. 2014).

(i)

The observed SSB continuum intensity not corrected for main beam efficiency.

(j)

The rms noise relative to TC

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