Abstract
The hyperfine structure of thallium iodide has been studied in the J = 3 and J = 4 rotational states in an attempt to observe a nuclear electric hexadecapole effect. This study was carried out on a high-resolution molecular-beam electric resonance spectrometer at very weak electric and magnetic fields. The molecule is well described by the usual five hyperfine interaction constants which are (in kilohertz) Tl127205ITl127203IeqQ− 438 916.3 ± 0.5− 438 917.3 ± 1.0c13.05 ± 0.053.09 ± 0.1c234.65 ± 0.1534.36 ± 0.3c3− 2.48 ± 0.1− 2.59 ± 0.2c4− 6.67 ± 0.05− 6.57 ± 0.1. No evidence for a hexadecapole interaction constant as large as 500 Hz was found; this result is interpreted as setting an upper limit of ∼ 10−47 cm4 for the nuclear electric hexadecapole moment of 127I.
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