Molecular opacities of the transitions for the lowest four singlet states of BeH+

The rovibrational transition lines are computed for the lowest four singlet states of BeH+, including three 1Σ+ and one 1Π states, and the collisionally-broadened BeH+ opacities relevant to stellar atmospheres are computed using these line lists for the temperatures of 1800 K, 4500 K, 10,000 K, 20,000 K and a pressure of 100 atms. The ab initio multi-reference single- and double-excitation configuration interaction (MRDCI) method is employed to calculate the potentials and dipole transition momentum, based on which the spectroscopic constants are extracted and the corresponding ro-vibrational energies, Einstein coefficients as well as oscillator strengths are computed with high precision. For the convenience of relevant application, the partition functions are calculated from 100 K to 40,000 K, which are important for the modeling of features of interstellar observations as well as the fusion plasma emissions in the edge and divertor region.