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We use accurate ab initio and quantum scattering calculations to explore theprospects for sympathetic cooling of the heavy molecular radicalSrOH($^2\Sigma$) by ultracold Li atoms in a magnetic trap. A two-dimensionalpotential energy surface (PES) for the triplet electronic state of Li-SrOH iscalculated ab initio using the partially spin-restricted coupled cluster methodwith single, double and perturbative triple excitations and a largecorrelation-consistent basis set. The highly anisotropic PES has a deep globalminimum in the skewed Li-HOSr geometry with $D_e=4932$ cm$^{-1}$ and saddlepoints in collinear configurations. Our quantum scattering calculations predictlow spin relaxation rates in fully spin-polarized Li+SrOH collisions with theratios of elastic to inelastic collision rates well in excess of 100 over awide range of magnetic fields (1-1000 G) and collision energies(10$^{-5}-0.1$~K) suggesting favorable prospects for sympathetic cooling ofSrOH molecules with spin-polarized Li atoms in a magnetic trap. We find thatspin relaxation in Li+SrOH collisions occurs via a direct mechanism mediated bythe magnetic dipole-dipole interaction between the electron spins of Li andSrOH, and that the indirect (spin-rotation) mechanism is strongly suppressed.The upper limit to the Li+SrOH reaction rate coefficient calculated for thesinglet PES using adiabatic capture theory is found to decrease from $4\times10^{-10}$~cm$^3$/s to a limiting value of $3.5\times 10^{-10}$ cm$^3$/s withdecreasing temperature from 0.1 K to 1 $\mu$K.

physical review. a/physical review, a

Cold collisions of heavy $^2\Sigma$ molecules with alkali-metal atoms in  a magnetic field: Ab initio analysis and prospects for sympathetic cooling of  SrOH$(^2\Sigma)$ by Li($^2$S)