Spectroscopic constants and anharmonic force field of thiirane: a theoretical study

Abstract

The potential interstellar medium molecule, thiirane, has received considerable attention of experimental and theoretical studies in recent years. The anharmonic force field and spectroscopic constants of thiirane are calculated using CCSD(T) and B3LYP methods employing correlation consistent basis sets. Molecular structure, ground state rotational constants, quartic and sextic centrifugal distortion constants, and fundamental frequencies of thiirane are compared with the available experimental data. The B3LYP and CCSD(T) results can reproduce them well. The rotational parameters and vibrational wave numbers of isotopologues for thiirane are also determined using B3LYP method. The new data obtained in this study might be used to assist astronomical search for thiirane.

Graphical Abstract

Keywords:

• Anharmonic force field
• molecular structure
• spectroscopic constants
• thiirane

Disclosure statement

No potential conflict of interest was reported by the author(s)

Additional information

Funding

This work was supported by the Natural Science Foundation of Inner Mongolia Autonomous Region (Grant No. 2020MS01023).