Statistical nuclear spin ratios of deuterated ammonia in the pre-stellar core L1544

Open Access

Table 1

Observed transitions.

Transition		Freq. (MHz)^a	E_u (K)	n_crit (cm⁻³)^b
APEX
oNH₂D	$1_{01}^{a} - 0_{00}^{a}$ $\[1_{01}^{\mathrm{a}}-0_{00}^{\mathrm{a}}\]$	332781.803	16.6	7.1 × 10⁴
pNH₂D	$1_{01}^{s} - 0_{00}^{s}$ $\[1_{01}^\text{s}-0_{00}^\text{s}\]$	332822.521	16.0	6.6 × 10⁴
oNHD₂	$1_{11}^{s} - 0_{00}^{s}$ $\[1_{11}^{\mathrm{s}}-0_{00}^{\mathrm{s}}\]$	335513.715	16.1	7.4 × 10⁴
pNHD₂	$1_{11}^{a} - 0_{00}^{a}$ $\[1_{11}^{\mathrm{a}}-0_{00}^{\mathrm{a}}\]$	335446.240	16.3	8.4 × 10⁴
IRAM 30 m
oNH₂D	$1_{11}^{s} - 1_{01}^{a}$ $\[1_{11}^{\mathrm{s}}-1_{01}^{\mathrm{a}}\]$	85926.258	20.7	6.1 × 10⁴
pNH₂D	$1_{11}^{a} - 1_{01}^{s}$ $\[1_{11}^{\mathrm{a}}-1_{01}^{\mathrm{s}}\]$	110153.550	21.3	1.3 × 10⁵

Notes.^aThe frequencies are adopted from Melosso et al. (2021). ^bComputed at 10 K.

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