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Table A.3.

Rotational and centrifugal distortion constants of SiC2.

Molecular parameters Units MHz × Laboratorya Laboratorya + IRAMb Laba + IRAMb + HIFIc Laba + IRAMb + HIFId
A 52474.1898(774) 52474.03145(857) 52474.02946(763) 52474.02349(801)
B 13158.71481(190) 13158.710065(922) 13158.710948(769) 13158.711999(863)
C 10441.57948(267) 10441.58338(116) 10441.580439(714) 10441.580011(746)
ΔJ 10−02 1.321879(473) 1.318969(485) 1.317942(334) 1.318246(410)
ΔJK 1.538141(100) 1.5383075(501) 1.5383510(443) 1.5383769(454)
ΔK −1.2219(182) −1.268137(509) −1.267987(478) −1.268456(491)
δJ 10−03 2.42102(441) 2.40681(177) 2.413326(754) 2.413465(987)
δK 10−01 8.70720(391) 8.69554(129) 8.697376(898) 8.69981(113)
HJ 10−07 .... −1.0877(937) −1.4728(794) −1.390(103)
HJK 10−05 −5.932(374) −4.6759(741) −4.8821(309) −4.7495(359)
HKJ 10−04 4.222(124) 3.7967(238) 3.8901(129) 3.8476(147)
hJK 10−05 −2.908(140) −3.7687(489) −3.5660(168) −3.5116(375)
hK 10−03 0.8667(717) 1.1055(141) 1.07106(575) 1.09098(701)
LJ 10−11 .... .... 4.706(558) 3.795(713)
LJJK 10−09 −4.68(101) −4.648(734) −1.211(172) −2.555(149)
LJK 10−07 −1.0414(903) −1.2421(215) −1.3680(208) −1.3992(212)
LKKJ 10−07 1.477(250) 2.2275(504) 2.051(106) 2.302(111)
lJK 10−09 .... .... .... −1.010(184)
PJ 10−15 .... .... −9.52(119) −7.61(139)
PJK 10−11 .... .... .... −3.614(115)
PKJ 10−10 .... .... 1.3096(919) 2.777(130)
PKKJ 10−10 .... .... −2.777(462) −5.147(518)
pKKJ 10−10 .... .... 5.894(167) ....
Ne .... 30 125 579 579
Jmax .... 17 24 53 53
Kmax .... 10 12 16 16
νmax 364948.2 364948.2 1112643.6 1112643.6
σ 0.030 0.136 2.105 2.211
σw .... 1.128 0.965 0.944 0.968

Notes. Numbers in parentheses represent the derived uncertainty (1σ) of the parameter in units of the last digit.

(a)

Fit to the rotational lines reported by Gottlieb et al. (1989) and Suenram et al. (1989). Uncertainties for these lines are from Müller et al. (2012).

(b)

New lines between 70 and 355 GHz have been added to the data set reported by Müller et al. (2012). The increase in sensitivity and spectral resolution in the IRAM data since 2012 have permitted to obtain more precise frequencies in that frequency range. Frequencies for all lines used by Müller et al. (2012) have been determined using the new IRAM 30 m data.

(c)

The selected HIFI data are from Cernicharo et al. (2010) and Müller et al. (2012). Frequencies for HIFI lines have been measured again taken into account possible blends with other features. Some of the lines reported by Müller et al. (2012) have been rejected due to its poor signal to noise ratio (see text). This column corresponds to Fit A and is the recommended one.

(d)

Fit B uses the same set of data as 3 but adding to the fitted centrifugal distortion constants lJK and PJK, and removing pKKJ (see text).

(e)

Number of fitted lines (each doublet counts as one single line).

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