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 1

Root-mean-square (rms) deviations from the global fit^a of transitions involving v_t = 0 torsional energy levels of HCO¹⁸OCH₃ methyl formate.

Number of parameters				30 (+1fixed)
Number of lines				4430
rms of the 4430 MW v_t = 0–0 lines				0.0478 MHz
rms of the 2256 A symmetry lines				0.051 MHz
rms of the 2174 E symmetry lines				0.044 MHz

Source^b	Range^c (GHz)	v_t, J_max, K_max^d	Number of lines^e	Uncertainties^f (MHz)	rms^g (MHz)

FTMW-LILLE	1–20	0, 7, 2	30	0.003	0.0024
SMM-LILLE^h	150–660	0, 62, 30	4148	0.030–0.050	0.0254
SMM-LILLE^h	150–660	0, 25, 6	4	0.100	0.0769
OSLO	7–80	0, 36, 9	248	0.150	0.1729

Notes.

^(a)

Parameter values are given in Table 4. The observed minus calculated residuals are given in the supplementary Table S1.

^(b)

Sources of data: FTMW-LILLE, SMM-LILLE and OSLO data comes from present work, see experimental section.

^(c)

Range containing the measurements in a given row.

^(d)

v_t state and maximum J and K_a for each group of measurements.

^(e)

Number of MW lines in each uncertainty group.

^(f)

One-sigma standard uncertainty in MHz used in the fit.

^(g)

Root-mean-square deviation in MHz for each group.

^(h)

The SMM-LILLE spectrometer spectral ranges for these measurements are: 150–322 GHz, 400–533 GHz and 583–660 GHz.

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