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Quadrupole transitions in the bound rotational-vibrational spectrum of the tritium molecular ion

The nonrelativistic energies of the homonuclear ion T$_2^+$ are calculated for the ground state using the Lagrange-mesh method as was done for the isotopomers H$_2^+$ and D$_2^+$ ({\it J. Phys. B: At. Mol. Opt. Phys.} {\bf 45} 065101 and {\it J. Phys. B: At. Mol. Opt. Phys.} {\bf 46} 245101). Energies and eigenfunctions are obtained up to four of the lowest bound vibrational states ($v=0,1,2,3$) which support 62, 61, 60 and 58 bound rotational states, respectively. Some quasibound sates are also presented until $L =$ 68. From the obtained wave functions, electric quadrupole transitions per time unit are calculated between those states over the whole rotational bands. Extensive results are presented with 6 significant digits. The ground state energy of the symmetric systems $^{\infty}$H$_2^+$, $^{\infty}$H$^-$, Ps$^{-}$, H$^-$, D$^-$, T$^-$, $μ^+μ^+e$ and $μ^+e\,e$ is presented with high accuracy as a function of $β=m_3/(2m+m_3)$.