Abstract
The molecular-beam electric-resonance technique has been used to measure the hyperfine interaction constants of the J=1, v=0 state of 7Li79,81Br in the limit of weak external fields. The results for the bromine and lithium nuclear electric quadrupole interaction constants, eqQBr and eqQLi, the spin-rotation constants, cBr and cLi, the ``tensor'' nuclear spin-spin interaction, c3, and the ``scalar'' nuclear spin-spin interaction are (in kilohertz) Li797BrLi817BreqQBr38368.104(36)32050.860(46)eqQLi211.04(10)211.03(13)cBr7.8816(58)8.4740(74)cLi0.859(15)0.815(19)c31.0710(61)1.1789(78)c40.0604(70)0.0711(89)A theory which permits the calculation of the optimum power required to drive the hyperfine transitions is presented and experimentally verified. A possible pseudoquadrupole effect is discussed, and recent calculations of molecular electric field gradients are used to determine the nuclear quadrupole moments.
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