High-resolution terahertz spectroscopy of the 15NH radical (Σ−)

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Table 2

Observed (J′ ← J′′ = 0 ← 1 at the PhLAM laboratory) and calculated (J′ ← J′′ = 2 ← 1 and 1 ← 1) frequencies (in MHz) of the N = 1 ← 0 ground-state rotational transition of ¹⁵NH (), given together with the base-10 logarithm of the Einstein coefficient for spontaneous emission (in s^-1).

J′ ← J′′	F₁′,F′ ← F₁′′,F′′	ν_obs^a	ν_obs − ν_calc	LogA₂₁^e

0 ← 1
	1/2,1 ← 1/2,0	942036.954(100)	0.002	−2.204
	1/2,1 ← 1/2,1	942070.537(100)^b	−0.002	−2.204
	1/2,0 ← 1/2,1	942070.537(100)^b	−0.002	−1.726
	1/2,1 ← 3/2,1	942143.471(100)^c	−0.002	−2.203
	1/2,0 ← 3/2,1	942143.471(100)^c	−0.002	−1.726
	1/2,1 ← 3/2,2	942176.923(100)	0.002	−2.203
2 ← 1
	3/2,2 ← 1/2,1	970147.73(50)^d		−2.387
	5/2,3 ← 3/2,2	970152.62(50)^d		−2.533
	3/2,1 ← 1/2,0	970159.93(50)^d		−2.165
	5/2,2 ← 3/2,1	970164.82(50)^d		−2.387
	3/2,1 ← 1/2,1	970193.48(50)^d		−2.165
	5/2,2 ← 3/2,2	970198.36(50)^d		−2.387
	3/2,2 ← 3/2,2	970254.16(50)^d		−2.387
	3/2,1 ← 3/2,1	970266.36(50)^d		−2.165
1 ← 1
	3/2,1 ← 1/2,0	995534.36(90)^d		−2.132
	1/2,1 ← 1/2,0	995565.57(90)^d		−2.132
	1/2,0 ← 1/2,1	995571.81(90)^d		−1.654
	3/2,2 ← 1/2,1	995595.05(90)^d		−2.353
	1/2,1 ← 1/2,1	995599.11(90)^d		−2.132
	3/2,1 ← 3/2,1	995640.79(90)^d		−2.131
	1/2,0 ← 3/2,1	995644.70(90)^d		−1.654
	3/2,2 ← 3/2,1	995667.94(90)^d		−2.353
	1/2,1 ← 3/2,1	995671.99(90)^d		−2.131
	3/2,1 ← 3/2,2	995674.33(90)^d		−2.131
	3/2,2 ← 3/2,2	995701.48(90)^d		−2.353
	1/2,1 ← 3/2,2	995705.54(90)^d		−2.131

Notes.

^(a)

Values in parentheses are 1σ experimental or calculated error on the last digits.

^{(b, c)}

Unresolved lines.

^(d)

These values are predicted frequencies since the corresponding transitions were outside the range of the millimetre-wave sources.

^(e)

Calculations were done using the dipole moment of ¹⁴NH: μ = 1.389 D found in Reference 1.

References. (1) Scarl & Dalby (1974).

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