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We developed an optical frequency standard using 40Ca+ with the 4 2S1/2-3 2D5/2 electric quadrupole transition. Its absolute transition frequency is 411 042 129 776 390(7) Hz. The uncertainty is limited by the electric quadrupole shift and ambient magnetic field fluctuation. To determine the absolute transition frequency with a better uncertainty, we have observed two pairs of the symmetrically-splitting...
Fe-N films were deposited on glass substrates by rf sputtering with a mixture of Ar, He and N2 gases. The relationship between the properties of the films and the plasma species was investigated by optical emission spectroscopy analysis. In the Ar+He+N2 plasma, many N2+ molecular ions were generated by He atoms in neutral excited metastable states through the Penning ionization, and contributed to...
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