The 170 and *H quadrupole coupling constants of rovibrational levels of 1701H+, 17@H+, and 16@H+ in their P Zstate have been calculated from molecular wave functions that explicitly describe nuclear motion. The 1 7 0 quadrupole coupling is predicted to be strong and its vibrational dependence differs from that known for other nuclei A in the first-row hydrides AH or AH'. The deuterium coupling in 17@H+ and 1602H+ is found to be weak and its behavior is similar to that of other first-row hydrides. The change with rotational excitation is unimportant. The quadrupole hyperfine patterns of l7@H+ in its ground state are dominated by the strong oxygen coupling. 0 1996 John Wiley & Sons, Inc. and the submillimeter [lo-121 wave regions. The hyperfine structure of the lowest rotational ( N = 1 -0) transition in the X 3 2 -, v = 0 state of OH+ and the N = 2 + 1 transition of OD+ has been partially resolved [ll, 121. Some hyperfine coupling parameters have also been obtained theoretically [13,14]; the quadrupole hyperfine structure of T the subject of both theoretical calculations of electronic structure 11-51 and extensive spectroscopic studies in ultraviolet [61, infrared [7-91,
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