Diode laser measurement of the infrared spectrum of silicon monosulfide

Birk, Helmut; Jones, Harold

doi:10.1016/0009-2614(90)85577-y

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…The potential parameters were obtained by nonlinear least squares fitting to the observed infrared and microwave line positions of the SiS isotopologues up to v=12. The final data set inckuded a total of 2863 lines, 414 rotational transitions (Tieman et al 1972; Sanz et al 2003; Müller et al 2007) and 2449 rovibrational transitions (Birk et al 1972; Frum et al 1990). Mass-independent Dunham coefficients, U ij , have been derived by Müller et al (2007).…”

Section: Resultsmentioning

confidence: 99%

Si-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLeo

Velilla-Prieto

Cernicharo

Quintana-Lacaci

et al. 2015

ApJ

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We report the detection of SiS rotational lines in high-vibrational states as well as SiO and SiC lines in their ground vibrational state toward IRC+10216 during the Atacama Large Millimeter Array Cycle 0. The spatial distribution of these molecules shows compact emission for SiS and a more extended emission for SiO and SiC, and also proves the existence of an increase in the SiC emission at the outer shells of the circumstellar envelope. We analyze the excitation conditions of the vibrationally excited SiS using the population diagram technique, and we use a large velocity gradient model to compare with the observations. We found moderate discrepancies between the observations and the models that could be explained if SiS lines detected are optically thick. Additionally, the line profiles of the detected rotational lines in the high energy vibrational states show a decreasing linewidth with increasing energy levels. This may be evidence that these lines could be excited only in the inner shells, i.e., the densest and hottest, of the circumstellar envelope of IRC+10216.

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Section: Resultsmentioning

confidence: 99%

Si-BEARING MOLECULES TOWARD IRC+10216: ALMA UNVEILS THE MOLECULAR ENVELOPE OF CWLeo

Velilla-Prieto

Cernicharo

Quintana-Lacaci

et al. 2015

ApJ

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“…Coxon & Hajigeorgiou (1992) are able to include this data in the final fit using their model. Coxon & Hajigeorgiou (1992) showed that a small number of fitted parameters were able to represent the entire spectroscopic dataset to within the measurement accuracies of about 0.001 cm −1 for the measurements of Birk & Jones (1990) and 0.0001 cm −1 for measurements of the strongest lines from Frum et al (1990).…”

Section: Potential Energy Curvementioning

confidence: 96%

“…Rotational transitions were observed for the isotope of least abundance 30 Si 36 S isotopologue in the ground vibrational state, as well as rotational transitions in v = 1 for 28 Si 32 S. Frum et al (1990) recorded the rotation-vibration spectrum of SiS at 13 µm (750 cm −1 ) using Fourier transform emission spectroscopy; they recorded seven bands for the parent isotopologue of SiS and three bands for each of the rarer isotopologues. Birk & Jones (1990) also measured the rovibrational spectrum for four isotopologues of SiS ( 28 Si 32 S, 28 Si 34 S, 29 Si 32 S, 30 Si 32 S) in the ground electronic state. Further experimental data for the vibrational energy levels of the ground electronic state of SiS is provided by Nair et al (1965).…”

Section: Previous Laboratory Studiesmentioning

confidence: 99%

“…A very accurate PEC was derived by Coxon & Hajigeorgiou (1992) by fitting to spectroscopic data. The fit employed microwave and infrared data on four isotopologues ( 28 Si 32 S, 28 Si 34 S, 29 Si 32 S, 30 Si 32 S) from Tiemann et al (1972), Birk & Jones (1990) and Frum et al (1990). The resulting PEC is valid for all isotopologues of SiS.…”

Section: Potential Energy Curvementioning

confidence: 99%

“…MSi and MS are the atomic masses of the isotopes of Si and S respectively. Initially Birk & Jones (1990) tried to invert their measured line positions data to a Born-Oppenhiemer potential as a Dunham expansion but were unable to fit high J line positions (J ≥ 100), which had to be excluded from the fit. Coxon & Hajigeorgiou (1992) are able to include this data in the final fit using their model.…”

Section: Potential Energy Curvementioning

confidence: 99%

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