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 2

Root-mean-square (rms) deviations from the global fit^a of transitions involving v_t = 0 torsional energy levels of HC¹⁸OOCH₃ methyl formate.

Number of parameters				29 (+1fixed)
Number of lines				3258
rms of the 3258 MW v_t = 0–0 lines				0.0448 MHz
rms of the 1720 A symmetry lines				0.048 MHz
rms of the 1538 E symmetry lines				0.041 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, 4, 1	11	0.003	0.0040


SMM-LILLE^h	150–660	0, 63, 30	2890	0.030–0.050	0.0277


SMM-LILLE^h	150–660	0, 52, 29	179	0.100	0.0788

OSLO	7–80	0, 33, 8	137	0.150
OSLO	7–80		3	0.200	0.1343
SMM-LILLE^h	150–660	0, 38, 29	38	0.200

Notes.

^(a)

Parameter values are given in Table 5. The observed minus calculated residuals are given in the supplementary Table S2.

^(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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