O2 ENERGY LEVELS, BAND CONSTANTS, POTENTIALS, FRANCK-CONDON FACTORS AND LINELISTS INVOLVING THE X3Σ−g, a1∆g AND b1Σ+g STATES

Abstract

The isotopically invariant Dunham fit of O$_2$ was updated with newly reported literature transitions to derive (1) the energy levels, band-by-band molecular constants and RKR potentials for the $X^{3}\Sigma^{-}_{g}$, $a^{1}\Delta_{g}$ and $b^{1}\Sigma^{+}_{g}$ states of the six O$_2$ isotopologues, $^{16}$O$^{16}$O, $^{16}$O$^{17}$O, $^{16}$O$^{18}$O, $^{17}$O$^{17}$O, $^{17}$O$^{18}$O and $^{18}$O$^{18}$O; (2) the line positions and Franck-Condon factors for their $a^{1}\Delta_{g}-X^{3}\Sigma^{-}_{g}$, $b^{1}\Sigma^{+}_{g}-X^{3}\Sigma^{-}_{g}$ and $a^{1}\Delta_{g}-b^{1}\Sigma^{+}_{g}$ band systems. The best available experimental and theoretical data were used as input for calculating intensities of lines involving the $X^{3}\Sigma^{-}_{g}$, $a^{1}\Delta_{g}$ and $b^{1}\Sigma^{+}_{g}$ states. The newly calculated positions and intensities are combined to provide HITRAN-format linelists.