THz spectroscopy and first ISM detection of excited torsional states of 13C-methyl formate

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Volume 568 (August 2014)

A&A, 568 (2014) A58

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Table 1

Root-mean-square (rms) deviations from the global fit^a of transitions involving v_t = 0 and v_t = 1 torsional energy levels of ¹³C₂-methyl formate (HCOO¹³CH₃).

Number of parameters				52
Number of lines				9455
rms of the 6574 MW v_t = 0–0 lines				0.0383 MHz
rms of the 2881 MW v_t = 1–1 lines				0.0419 MHz
rms of the 5184 A symmetry lines				0.0429 MHz
rms of the 4271 E symmetry lines				0.0349 MHz

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

AA09	4–20	0, 7, 3	27	0.005	0.0056

AA09	150–700^j	0, 63, 35	607	0.030	0.0252
NEW	50–940^k	0, 60, 35	4864	0.030
NEW	50–940^k	1, 60, 26	1731	0.030
AA09	150–700^j	0, 52, 27	2	0.050
NEW	50–940^k	0, 52, 35	577	0.050
NEW	50–940^k	1, 58, 26	814	0.050

AA09	8–700^j	0, 58, 29	43	0.100^h	0.0644
NEW	50–940^k	0, 55, 33	170	0.100ⁱ
NEW	50–940^k	1, 57, 26	203	0.100ⁱ

AA09	8–700^j	0, 33, 11	122	0.150^h	0.1345
NEW	50–940^k	0, 54, 33	49	0.150ⁱ
NEW	50–940^k	1, 55, 24	68	0.150ⁱ
AA09	8–700^j	0, 58, 25	45	0.200^h
NEW	50–940^k	0, 55, 31	68	0.200ⁱ
NEW	50–940^k	1, 55, 20	65	0.200ⁱ

Notes.

^(a)

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

^(b)

Sources of data: AA09 stands for Carvajal et al. (2009) and NEW data come from the present work. The spectroscopic instruments are described in Sect. 2.2.

^(c)

Spectral range of the measurements.

^(d)

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

^(e)

Number of MW lines in each uncertainty group.

^(f)

Uncertainty in MHz used in the fit.

^(g)

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

^(h)

The details of the accuracy of spectral measurements are given in Carvajal et al. (2009).

⁽ⁱ⁾

The accuracy of spectral measurements for the Lille spectrometer is about 0.030 MHz for isolated lines but some lines are either blended or present a poor S/N ratio and therefore their measurement accuracy is taken as either 0.100 MHz, 0.150 MHz or 0.200 MHz according to the broadening of the experimental line.

^(j)

The spectrometer spectral ranges for these measurements are 8−80 GHz, 150−245 GHz, 320−350 GHz, 510−525 GHz, and 580−661 GHz (for more details, see Carvajal et al. 2009).

^(k)

The spectrometer spectral ranges for the measurements of present work are: 50−100 GHz and 150−940 GHz, using a multiplication chain of solid state sources, and 100−150 GHz, using a backward wave oscillator.

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