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As a follow-up to a recent study in the spin-0 case [J. Bunao and E. A.Galapon, Ann. Phys. 353, 83-106 (2015)], we construct a one-particle Time ofArrival (TOA) operator conjugate to a Hamiltonian describing a freerelativistic spin-1/2 particle in one spatial dimension. Upon transformation ina representation where the Hamiltonian is diagonal, it turns out that theconstructed operator consists of an operator term $\mathcal{\hat{T}}$ whoseaction is the same as in the spin-0 case, and another operator term$\mathcal{\hat{T}}_0$ which commutes with the Hamiltonian but breaks invarianceunder parity inversion. If we must impose this symmetry on our TOA operator,then we can throw away $\mathcal{\hat{T}}_0$ so that the TOA operator is just$\mathcal{\hat{T}}$.

A Relativistic One-Particle Time of Arrival Operator for a Free Spin-1/2 Particle in (1 + 1) Dimensions