The absorption of sulfur dioxide in the terahertz range at temperatures of 300–1200 K

The rotational spectrum of the absorption of the main isotope of sulfur dioxide ($^{32}$S$^{16}$O$_2$), which corresponds to the terahertz range of electromagnetic waves, namely 1–250 cm$^{-1}$ (0.1–10 THz), is studied. The consideration covers rotational transitions within all vibrational states whose Hamiltonian parameters are known from the literature: (000-000), (010-010), (100-100), (001-001), (020-020), (110-110), (011-011), (030-030), (120-120), (200-200), (002-002), (130-130), (103-103), (301-301), (101-101), (021-021), (210-210), (111-111), (201-201), (003-003), and (131-131). As a result, the absorption coefficient of $^{32}$S$^{16}$O$_2$ is calculated for a broad temperature range (300–1200 K) and the contribution of the rotational band of each vibrational state to the total absorption coefficient is evaluated.