The Zeeman effect in the [17.6]7.5-X ₁8.5 transition of holmium monoxide

The high resolution molecular beam laser induced fluorescence (LIF) spectrum of the (0, 0) band of the [17.6]7.5-X ₁8.5 system of holmium monoxide, HoO, has been recorded field free and in the presence of a variable magnetic field. The Zeeman shifts and splittings in the LIF spectra of several hyperfine lines of the R(8.5) and P(8.5) transitions were analyzed to produce values for the magnitude of the effective magnetic g-factors, g _eff, of 9.86(2), 10.04(2) and 11.04(2) for [17.6]7.5, v = 0, J = 7.5 and 9.5 and X ₁8.5, v = 0, J = 8.5 respectively. Comparison with calculated values of g _eff indicated that, in a Hund's case (a) description, the transition was primarily ⁶H _7.5- ⁶I _8.5.