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Table 1

Root-mean-square (rms) deviations from the global fita of transitions involving vt = 0 torsional energy levels of deuterated methyl formate (DCOOCH3).

Number of parameters 27
Number of lines 3763
rms of the 3763 vt = 0-0 lines 0.1043 MHz
rms of the 2232 A symmetry lines 0.1072 MHz
rms of the 1531 E symmetry lines 0.0998 MHz
Sourceb Rangec (GHz) Jmax, Kmaxd Number of linese Uncertaintiesf (MHz) rmsg (MHz) σ h
FTMW-Lille 4–18 7,4 18 0.003 0.0029 0.96
21 0.010 0.0181 1.81
BWO-Lille 580–661 64,36 485 0.050 0.0506 1.01
OEST 91–377 30,25 816 0.080 0.0581 0.73
BWO-Lille 580–661 57,29 50 0.100 0.1041 1.04
JPLi 850–1205 69,36 1814 0.100
OSLO 7–80 48,16 260 0.150
16 0.200
BWO-Lille 580–661 57,35 31 0.200 0.1728 0.94
CURL 227–290 5, 1 5 0.200
OEST 91–377 26, 6 10 0.200
JPLi 1205–1466 69,35 237 0.200

Notes.

(a)

Parameter values are given in Table 2. The complete list of observed minus calculated residuals of vt = 0 lines are given in supplementary Table A.1.

(b)

Sources of data: OEST (Oesterling et al. 1995); BWO-Lille, FTMW-Lille and OSLO data come from Margulès et al. (2010) and CURL data come from (Curl 1959). JPL data have been measured in this work.

(c)

Spectral range of the measurements.

(d)

Maximum J and Ka for each group of measurements.

(e)

Number of lines in each uncertainty group.

(f)

Measurement uncertainty in MHz used in the fit.

(g)

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

(h)

Unitless standard deviation of each set of measurements (where the differences between the observed and calculated frequencies in the standard deviation formula are weighted with their experimental uncertainties).

(i)

The spectrometer spectral range for these measurements is 850–1466 GHz. The experimental uncertainty is generally better than 0.100 MHz for isolated lines below 1205 GHz, but some lines are either blended or present a poor signal-to-noise ratio, therefore their measurement accuracy was taken to be 0.200 MHz according to the broadening of the experimental line. Above 1205 GHz, the experimental uncertainty for isolated lines is considered better than 0.200 MHz.

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