Laboratory rotational spectroscopy of isotopic acetone, CH313C(O)CH3 and 13CH3C(O)CH3, and astronomical search in Sagittarius B2(N2)

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This article has 2 errata:
[https://doi.org/10.1051/0004-6361/201935428e]
[https://doi.org/10.1051/0004-6361/201935887e]

Table 2.

Relative intensities resulting from internal rotation of both methyl groups in acetone.

Torsional substate		CH₃C(O)CH₃		¹³CH₃C(O)CH₃
		C(O)CH₃
(σ₁, σ₂) ^(a)	(σ₁, σ₂) ^(b)	ee ↔ oo^(c)	eo ↔ oe^(c)
( 0, 0)	( 0, 0)	3	5	2
(±1, 0)	( 1, 0)			2
(0, ±1)	( 0, 1)	8	8	2
(±1, ±1)	( 1, 1)	1	3	1
(±1, ∓1)	( 1, 2)	2	2	1

Notes.

^(a)

Quantum numbers of the internal rotation Hamiltonian of the two methyl groups in the absence of external electromagnetic fields, σ₁ and σ₂, respectively.

^(b)

ERHAM notation.

^(c)

Selection rules for transitions from energy levels with even (e) and odd (o) quantum numbers of K_a and K_c ().

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