Table 1.
Spectroscopic parameters for HCSCN, HC34SCN, and HCSCCH.
| Constant | TMC-1 (a) | Laboratory (b) | Merged fit (c) | Laboratory 34S (d) | Bogey et al. (1989)(e) | Zaleski et al. (2012)(f) | HCSCCH (g) |
|---|---|---|---|---|---|---|---|
| A (MHz) | 42910.051(11) | 42910.0474(25) | 42910.0478(21) | 42604.3412 (h) | 43314.0052(34) | 42909.9686(83) | 42652.03185(40) |
| B (MHz) | 3195.4016(17) | 3195.40149(55) | 3195.40171(26) | 3116.7454(14) | 3205.67686(24) | 3195.3952(17) | 3109.382386(28) |
| C (MHz) | 2970.1303(17) | 2970.13104(54) | 2970.13067(28) | 2900.6315(14) | 2975.32470(23) | 2970.1273(18) | 2894.265480(28) |
| DJ (kHz) | 1.2767(93) | 1.2812(76) | 1.2792(28) | 1.228(30) | 1.26557(17) | 1.218(11) | 1.1298295(90) |
| DJK (kHz) | −104.31(33) | −104.29(14) | −104.33(12) | −102.09(26) | −102.0177(24) | −105.78(38) | −104.85202(18) |
| d1 (kHz) | −0.2288(64) | −0.2228(96) | −0.2277(25) | −0.247(41) | −0.228786(42) | 0.2173(93) | −0.2110838(23) |
| χaa MHz | −3.46(16) | −3.5118(20) | −3.5117(20) | −3.4952(33) | −3.53(20) | ||
| χbb MHz | 0.83(12) | 0.8384(22) | 0.8385(22) | 0.828(11) | 0.86(30) | ||
| Number of lines | 32 (i) | 53 | 85 | 21 | 152 | 36 | 77 |
| σ(kHz) | 11.8 | 1.3 | 8.9 | 1.2 | 28.8 | 22.1 | 7.5 |
| Jmax, Kamax | 9, 1 | 4,1 | 9,1 | 3,1 | 58,20 | 20,5 | |
| νmax (GHz) | 50.204 | 25.112 | 50.204 | 18.376 | 279.98 | 51.3 | |
Notes. Values between parentheses correspond to the uncertainties of the parameters in units of the last significant digits.
Merged fit using our laboratory measurements and the frequencies measured in TMC-1. This is the recommended set of constants to predict the frequencies of HCSCN.
Rotational constants for HCSCN from Bogey et al. (1989): They probably correspond to a vibrational state of HCSCN but not to the ground state of this species (see Appendix ). Additional distortion constants were obtained by these authors, but they are not relevant for the present work.
Rotational constants for HCSCN from Zaleski et al. (2012). The d1 constant corresponds in this case to −δJ.
Rotational constants for HCSCCH derived from a fit to the data observed for this species by Brown & Godfrey (1982), Cabtree et al. (2016), and Margulès et al. (2020). The full set of distortion constants are provided by Margulès et al. (2020).
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