Finding the ultra-narrow ${}^3{P}_2\to {}^3{P}_0$ electric quadrupole transition in Ni${}^{12+}$ ion for an optical clock

Charles Cheung, Sergey G. Porsev, Dmytro Filin +7

The Ni${}^{12+}$ ion features an electronic transition with a natural width of only 8 mHz, allowing for a highly stable optical clock. We predict that the energy of this strongly for…