Abstract
The ground-state rotational spectrum of 27Al 127I has been investigated by Fourier-transform microwave spectroscopy. AlI was generated by reaction of laser-ablated aluminium vapour with methyl iodide. The rotational constant ( B 0), nuclear quadrupole coupling constants ( χ aa Al , χ aa I ) and the nuclear spin-rotation constant of iodine ( C bb I ) have been re-determined with high precision. The nuclear spin-rotation constant of aluminium ( C bb Al ) , the nuclear spin–spin constants ( D aa Al , I , δ Al , I ) and the dependence of the coupling constant χ aa I on J ( χ J I ) were determined. D aa Al , I and δ Al,I agree with calculated values and χ J I is consistent in sign and magnitude with the known dependence of χ aa I on vibrational state.
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