ExoMol line lists XXIV: A new hot line list for silicon monohydride, SiH

Sergei N. Yurchenko, Frances Sinden, Lorenzo Lodi, Christian Hill, Maire Gorman, Jonathan Tennyson

Research output: Contribution to journalArticlepeer-review

38 Citations (SciVal)
132 Downloads (Pure)

Abstract

SiH has long been observed in the spectrum of our Sun and other cool stars. Computed line lists for the main isotopologues of silicon monohydride, 28SiH, 29SiH, 30SiH and 28SiD are presented. These line lists consider rotation-vibration transitions within the ground X 2Π electronic state as well as transitions to the low-lying A 2Δ and a 4Σ− states. Ab initio potential energy (PECs) and dipole moment curves (DMCs) along with spin-orbit and electronic-angular-momentum couplings between them are calculated using the MRCI level of theory with the MOLPRO package. The PEC for the ground X 2Π state is refined to available experimental data with a typical accuracy of around 0.01 cm−1 or better. The 28SiH line list includes 11,785 rovibronic states and 1,724,841 transitions with associated Einstein-A coefficients for angular momentum J up to 82.5 and covering wavenumbers up to 31340 cm−1 (λ < 0.319 μm). Spectra are simulated using the new line list and comparisons made with various experimental spectra. These line lists are applicable up to temperatures of 5000 K, making them relevant to astrophysical objects such as exoplanetary atmospheres and cool stars and opening up the possibility of detection in the interstellar medium. These line lists are available at the ExoMol (www.exomol.com) and CDS database websites
Original languageEnglish
Article numberstx2738
JournalMonthly Notices of the Royal Astronomical Society Letters
Volume473
Issue number4
DOIs
Publication statusPublished - 01 Feb 2018

Keywords

  • molecular data
  • opacity
  • astronomical data bases
  • miscellaneous
  • planets and setellites
  • atmospheres
  • stars
  • low-mass

Fingerprint

Dive into the research topics of 'ExoMol line lists XXIV: A new hot line list for silicon monohydride, SiH'. Together they form a unique fingerprint.

Cite this