The National Institute of Standards and Technology (NIST) has released a comprehensive database of diatomic molecules with 1Σ electronic ground states. These molecules are commonly studied using microwave techniques. The database provides detailed information on their rotational energy levels, which can be described using quantum numbers J, F, and v. The database also includes selection rules for rotational transitions and energy level expressions derived from the Dunham formulation.
In addition to rotational energy levels, the database includes information on hyperfine structure, which arises from nuclear electric quadrupole interaction and magnetic spin-rotation effects. This hyperfine structure is observable in many diatomic molecules with one nucleus of nuclear spin I ≤ 1. The database provides expressions for vibrational and rotational energy levels, incorporating coefficients derived from the Dunham formulation.
The NIST diatomic spectral database is a valuable resource for researchers studying the properties and behavior of diatomic molecules with 1Σ electronic ground states. It will facilitate more accurate predictions and measurements of their rotational energy levels and hyperfine structure, ultimately advancing our understanding of these molecules and their applications in various fields.
Keywords: Quantum Sensors, Quantum Metrology, Sensing
