[en] A time-of-flight coincidence detector is demonstrated. This detector is optimized for use in a pseudocontinuous resonance enhanced multiphoton ionization scheme that requires photoelectrons and photoions to be detected in coincidence. The detector utilizes two simultaneously operating charged particle detectors, one for the detection of electrons and the other for the detection of ions. In order to allow for field reversal, the detectors are physically identical, differing only by the value of applied voltages. Particular attention is given to the implementation of a charge-to-voltage transducer that allows for subnanosecond detection of both electrons and ions.

[en] Resonance enhanced multiphoton ionization of the X₁²Π₁ at _∼sol∼ at ₂ state of lead monofluoride (²⁰⁸Pb¹⁹F) via the B ²Σ₁ at _∼sol∼ at ₂ state is demonstrated. The ionization potential is observed to be 7.54(1) eV. Limits on the lifetime of the B state are found to be consistent with that reported by Chen et al. The transition dipole moment for the X₁→B transition is found to be 0.005(1) a.u. Limits on the ionization cross section of the B state are found

[en] Pure rotational spectra of the ground electronic-vibrational X₁ state of ²⁰⁴Pb¹⁹F, ²⁰⁶Pb¹⁹F, ²⁰⁷Pb¹⁹F, and ²⁰⁸Pb¹⁹F are 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(leftarrow)X₁ transitions. These spectra are combined with published high-resolution infrared spectra of X₂↔X₁ 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 deg. C. 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 ²⁰⁷Pb 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.

[en] Here we report precision microwave spectroscopy of pure rotational transitions of the ²⁰⁷Pb¹⁹F isotopologue. We use these data to make predictions of the sensitivity of the molecule to P-odd, T-even and P-odd, T-odd effects.