Abstract
The ground-state microwave spectrum of methyl iodide has been measured between 59 and 240 GHz with a molecular beam spectrometer and by use of the Lamb dip method. The following molecular parameters have been accurately determined: B = 7501275.70(2) kHz; D J = 6.3070(2) kHz; D JK = 98.762(3) kHz; H J = −0.0051(6) Hz; H JK = 0.04(2) Hz; H KJ 4.51(3) Hz; eq. Q = −1934.136 (5) MHz; C ⊥= −17.40(6) kHz; C | = −19.4(5) kHz; x J = −1.41(4) kHz; x K = −38(1) kHz and x d = 26.2(6) kHz. The last three constants characterize the interaction of centrifugal distortion with quadrupole coupling. The data are used to determine the elements of the iodine nuclear magnetic shielding tensor. Comparisons of the shielding are made for molecules which contain one iodine atom.
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