Precision spectroscopy of the hydrogen molecular ion D2+

Expectation values of the Breit operators are calculated for the D-2(+) molecular ion with the vibrational number (nu = 0-4) and angular momentum (L = 0-4). Hyperfine splittings of energy levels of the states (nu = 0-4, L = 3,4) are also determined in the framework of the spin-dependent Breit-Pauli Hamiltonian, which can be considered as an extension of our previous work [ Phys. Rev. A 88, 032519 (2013)]. These theoretical calculations may be used to improve spectroscopic precision of D-2(+) and determine the dissociation or the ionization energy of D-2.