Measurement of the electric dipole moment of AlCl
Abstract
Measurements of the electric dipole moments of the $X^1\Sigma^+$ and $A^1\Pi$ electronic states of AlCl using cryogenic buffer-gas beam source reveal the necessity of spin-orbit coupling with extended spin states in theoretical calculations, impacting astrophysical models.
We report the measurement of the electric dipole moment of aluminum monochloride (AlCl) using a cryogenic buffer-gas beam source. Our measurements provide values for the dipole moments of the two lowest vibrational states of the X^1Sigma^+ and the A^1Pi electronic states. We also show that spin-orbit coupling with an extended number of spin states is essential in the ab initio calculation to correctly describe both the dipole moment and the Te energy of AlCl. We further lay out the implications of these results for astrophysical models of stellar and planetary evolution that have used a substitute value for the dipole moment of AlCl until now.
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