Magnetic properties of silicon and germanium monoxide

Molecular beam electric resonance spectroscopy has been used to study silicon and germanium monoxide in the presence of an external magnetic field. For silicon monoxide the first three vibrational states of ²⁸Si¹⁶O were studied giving rotational magnetic moments, |g_J|, of 0.15359(12), 0.15450(11), and 0.15539(12) for v=0, v=1, and v=2, respectively. Similarly, the magnetic susceptibility anisotropies, ${\chi }_{\parallel }{\mathrm{-\; \chi }}_{\perp }$ , measured are −3.53(10), −3.66(8), and −3.80(10) kHz/kG². The molecular quadrupole moment, θ, is calculated to be −1.1(5) esu · cm². The first two vibrational states of germanium monoxide were studied for the ⁷⁰Ge¹⁶O, ⁷²Ge¹⁶O, and ⁷⁴Ge¹⁶O species. |g_J| (70)=0.14179(10), 0.14254(12), |g_J| (72) = −0.14134(11), 0.14208(10), |g_J| (74)= −0.14089(10), 0.14164(12), respectively, for v=0 and v=1. ${\chi }_{\parallel }{\mathrm{-\; \chi }}_{\perp }{\text{(70)=−4.18(10), −4.26(10), χ}}_{\parallel }{\mathrm{-\chi }}_{\perp }{\text{(72)=−4.17(11), −4.25(11), χ}}_{\parallel }{\mathrm{-\chi }}_{\perp }\text{(74)=−4.18(9), −4.26(11)}\mathrm{kHz}/{\mathrm{kG}}^2\text{. θ=−4.4(6)}\mathrm{esu}·{\mathrm{cm}}^2$ . The sign of the dipole moment of GeO is ⁺GeO⁻ assuming g_J <0.