Characterization of the ground X_1 state of ~(204)pb~(19)F, ~(206)pb~(19)F, ~(207)Pb~(19)F, and ~(208)Pb~(19)F

摘要

Pure rotational spectra of the ground electronic-vibrational X_1 state of ~(204)Pb~(19)F, ~(206)Pb~(19)F, ~(207)pb~(19)F. and ~(208)Pb~(19)Fare measured with a resonator pulsed supersonic jet Fourier-transform microwave spectrometer. Also reported is a new measurement of the Stark effect on the optical spectra of A ← X_1 transitions. These spectra are combined with published high-resolution infrared spectra of X_2 ← X_1 transitions in order to create a complete picture of the ground state of lead monofluoride. For the microwave data, molecules are prepared by laser ablation of lead target rods and stabilized in a supersonic jet of neon mixed with sulfur hexafluoride. For the optical Stark spectra, a continuous source of molecules is created in a nozzle heated to 1000℃. The microwave spectra confirm, improve, and extend previously reported constants that describe the rotational, spin-orbit, and hyperfine interactions of the ground electronic state of the PbF molecule. A discrepancy concerning the sign of the hyperfine constant describing the ~(207)Pb nucleus is discussed. Magnetic-field-dependent microwave spectra are used to characterize the Zeeman interaction in terms of two g factors of the body-fixed electronic wave function. The optical Stark spectra are used to characterize the electric dipole moment of the X1 and A states.