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The effects of non-adiabatic and Coriolis couplings on the bound states ofthe He(2 ^3S_1)+He(2 ^3P_j) system, where j=0,1,2, are investigated using therecently available ab initio short-range $^{1,3,5}\Sigma^+_{g,u}$ and$^{1,3,5}\Pi_{g,u}$ potentials computed by Deguilhem et al. (J. Phys. B: At.Mol. Opt. Phys. 42 (2009) 015102). Three sets of calculations have beenundertaken: single-channel, multichannel without Coriolis couplings and fullmultichannel with Coriolis couplings. We find that non-adiabatic effects arenegligible for $0^-_u,0^{\pm}_g,1_u,2_g,2_u,3_g$ Hund case (c) sets of levelsin the j=2 asymptote but can be up to 15% for some of the $0^+_u$ and $1_g$sets of levels where near degeneracies are present in the single-channeldiagonalized potentials. Coriolis couplings are most significant for weaklybound levels, ranging from 1-5% for total angular momenta J=1,2 and up to 10%for J=3. Levels near the j=1 and j=0 asymptotes agree closely with previousmultichannel calculations based upon long-range potentials constructed fromretarded resonance dipole and dispersion interactions. Assignment oftheoretical levels to experimental observations using criteria based upon theshort-range character of each level and their coupling to metastable groundstates produces well matched assignments for the majority of observations.After a 1% increase in the slope of the $^5\Sigma^+_{g,u}$ and $^5\Pi_{g,u}$input potentials near the classical turning point is applied, improved matchingof previous assignments is obtained and further assignments can be made,reproducing very closely the number of experimental observations.

Effects of non-adiabatic and Coriolis couplings on the bound states of He(2 ^3S)+He(2 ^3P)