Observation of Magnetic Octupole and Scalar Spin-Spin Interactions inI2Using Laser Spectroscopy

Abstract

Magnetic octupole and scalar spin-spin interactions have been observed in ${}_{}{}^{127}{}_{}{}^{}\mathrm{I}_2^{}{}_{}{}^{}$ by precisely measuring (line centers located to 1 part in ${10}^{11}$) the hyperfine spectrum on the $P\left(13\right)\mathrm{}$, 43-0 line using laser-molecular-beam techniques. The values of the coupling strengths obtained from fitting the spectrum are, for the electric quadrupole, $\mathrm{eQ}{q}^{\prime }=-554\mathrm{}094\pm 13$ kHz and $\mathrm{eQ}{q}^{\prime \prime }=-2\mathrm{}448025\pm 10$ kHz; for the spin-rotation, $C^{\prime }-C^{\prime \prime }=186.71\mathrm{}\pm 0.10$ kHz; for the tensor spin-spin, ${D_t}^{\prime }-{D_t}^{\prime \prime }=-100.5\mathrm{}\pm 1.0$ kHz; for the scalar spin-spin, ${D_s}^{\prime }-{D_s}^{\prime \prime }=-2.72\mathrm{}\pm 1.0$ kHz; and for the magnetic octupole, $\Omega m^{\prime }-\Omega m^{\prime \prime }=-2.17\mathrm{}\pm 0.70$ kHz.