Microwave and submillimeter spectroscopy and first ISM detection of 18O-methyl formate

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Volume 538 (February 2012)

A&A, 538 (2012) A119

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Table 3

Comparison of results of the fits using the code BELGI for the various isotopologues of methyl formate, using the same RAM method.

Molecules	V₃	F	s^a	ρ^b	θ_RAM^c	⟨ (i,a)^d	J_max			N^e	N_p^f	rms^g	Ref.

HC¹⁸OOCH₃	392	5.5^fixed	32	0.0798	26	55	63	30	0	3258	29	0.82	Present work
HCO¹⁸OCH₃	391	5.5^fixed	32	0.0806	26	54	62	30	0	4430	30	0.60	Present work
HCOO¹³CH₃	407	5.7^fixed	32	0.0845	24	52	63	34	0	936	27	1.08	Carvajal et al. (2009)
DCOOCH₃	389	5.5^fixed	31	0.0813	24	51	64	36	0	1703	24	1.11	Margulès et al. (2010)
H¹²COO¹²CH₃	373	5.5	30	0.0842	25	53	62	26	1	10533	55	0.71	Ilyushin et al. (2009)
H¹³COOCH₃	372	5.5	30	0.0841	25	52	59	27	1	7445	45	0.55	Carvajal et al. (2010)

Notes.

^(a)

Reduced height s = 4V₃ / 9F (unitless).

^(b)

Coupling constant between internal and global rotation (unitless).

^(c)

Angle between the rho-axis system and the principal axis system, for C_s molecules, in degrees.

^(d)

Angle between the methyl top symmetry axis and the a principal axis, in degrees.

^(e)

Number of lines included in the fit.

^(f)

Number of parameters used in the fit.

^(g)

Unitless Root-mean-square deviations, which should be 1.0 if the fit were good to experimental uncertainty.

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