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We present a theoretical study of the Zeeman relaxation of the magneticallytrappable lowest field seeking state of MnH(^7 \Sigma) in collisions with 3He.We analyze the collisional Zeeman transition mechanism as a function of thefinal diatomic state and its variation as a function of an applied magneticfield. We show that as a result of this mechanism the levels with \Delta Mj>2give negligible contributions to the Zeemam relaxation cross section. We alsocompare our results to the experimental cross sections obtained from the buffergas cooling and magnetic trapping of this molecule and investigate thedependence of the Zeeman relaxation cross section on the accuracy of the threebody interaction at ultralow energies.

Zeeman relaxation of MnH (X7{\Sigma}+) in collisions with 3He: mechanism and comparison with experiment