Discovery of the acetyl cation, CH3CO+, in space and in the laboratory

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Table 2.

Derived spectroscopic parameters (in MHz) for CH₃CO⁺.

Constant	Space ^(a)	Laboratory ^(b)	Merged ^(c)
B	9134.47424(82)	9134.47083(27)	9134.47211(20)
D_J	4.014(12) 10⁻³	3.99198(25) 10⁻³	3.99307(21) 10⁻³
D_JK	1.8847(53)10⁻¹	1.87616(41) 10⁻¹	1.87736(46) 10⁻¹
H_JK		8.66(33) 10⁻⁷	9.56(37) 10⁻⁷
H_KJ		6.58(59) 10⁻⁶	7.19(74) 10⁻⁶

rms(kHz) ^(d)	6.9	34.3	33.2
J_min/J_max	1/7	10/27	1/27
K_min/K_max	0/1	0/6	0/6
N_lines ^(e)	10	79	89
ν_max(GHz)	127.87	492.95	492.95

Notes.

^(a)

Fit to the lines of CH₃CO⁺ observed in TMC-1. In this fit, the J = 7−6 and K = 0, 1 lines observed in L1527 (with frequencies of 127877.133 ± 0.025 and 127874.494 ± 0.050 MHz, respectively) have been included (see Fig. A.1 and Appendix A).

^(b)

Fit to the lines of CH₃CO⁺ observed in the laboratory.

^(c)

Fit to the lines of CH₃CO⁺ observed in space and in the laboratory.

^(d)

The standard deviation of the fit (in kHz).

^(e)

Number of lines included in the fit.

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