Submillimeter-wave spectrum of H 2Se. Analysis of rotational spectra of all selenium isotopomers in the ground state
Submillimeter rotational spectra of all selenium modifications of H 2Se in the ground vibrational state were investigated. The number of MW data increased three times and the H 274Se rotational spectrum was measured for the first time. The data were analyzed using the modified Watson Hamiltonian, enabling us to reduce the number of parameters and to determine them more accurately compared to a conventional Hamiltonian. A combined analysis of MW frequencies and IR ground state combination differences yields rotational and centrifugal H 2Se constants.