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Based on the spectroscopic constants derived from highly accurate potentialenergy surfaces, the SeD radical is identified as a spectroscopic probe formeasuring spatial and temporal variation of fundamental physical constants suchas the fine-structure constant (denoted as $\alpha=\frac{e^2}{\hbar c}$) andthe proton-to-electron mass ratio (denoted as $\mu=\frac{m_p}{m_e}$). Theground state of SeD ($X^2\Pi$), due to spin-orbit coupling, splits into twofine structure multiplets $^2\Pi_{\frac{3}{2}}$ and $^2\Pi_{\frac{1}{2}}$. Thepotential energy surfaces of these spin-orbit components are derived from astate of the art electronic structure method, MRCI+Q inclusive of scalarrelativistic effects with the spin-orbit effects accounted through theBreit-Pauli operator. The relevant spectroscopic data are evaluated usingMurrel-Sorbie fit to the potential energy surfaces. The spin-orbitsplitting($\omega_f$) between the two multiplets is similar in magnitude withthe harmonic frequency ($\omega_e$) of the diatomic molecule. The amplificationfactor derived from this theoretical method for this particular molecule can beas large as 350, on the lower side it can be about 34. The significantly largevalues of K indicate that SeD radical can be a plaussible experimentalcandidate for measuring variation in $\alpha$ and $\mu$.

SeD Radical: A probe for measurement of time variation of Fine Structure Constant($\alpha$) and Proton to Electron Mass Ratio($\mu$)