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We investigate the nuclear dynamics near a real-valued conical intersectionthat is perturbed by a complex-valued spin-orbit coupling. For a modelHamiltonian with two outgoing channels, we find that even a small spin-orbitcoupling can dramatically affect the pathway selection on account of Berryforce, leading to extremely large spin selectivity (sometime as large as 100%).Thus, this Letter opens the door for organic chemists to start designingspintronic devices that use nuclear motion and conical intersections (combinedwith standard spin-orbit coupling) in order to achieve spin selection. Viceversa, for physical chemists, this Letter also emphasizes that futuresemiclassical simulations of intersystem crossing (which have heretoforeignored Berry force) should be corrected to account for the spin polarizationthat inevitably arises when dynamics pass near conical intersections.

Near Total Electronic Spin Separation as Caused by Nuclear Dynamics:  Perturbing a Real-Valued Conical Intersection with Complex-Valued Spin-Orbit  Coupling