OH hyperfine ground state: from precision measurement to molecular qubits
Abstract
We perform precision microwave spectroscopy--aided by Stark deceleration--to reveal the low magnetic field behavior of OH in its 23/2 ro-vibronic ground state, identifying two field-insensitive hyperfine transitions suitable as qubits and determining a differential Lande g-factor of 1.267(5)×10-3 between opposite parity components of the -doublet. The data are successfully modeled with an effective hyperfine Zeeman Hamiltonian, which we use to make a tenfold improvement of the magnetically sensitive, astrophysically important F=1 satellite-line frequencies, yielding 1720529887(10) Hz and 1612230825(15) Hz.
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