title: Zeeman-tuned rotational level-crossing spectroscopy in a diatomic free radical.
abstract: Rotational levels of molecular free radicals can be tuned to degeneracy by using laboratory-scale magnetic fields. Because of their intrinsically narrow width, these level crossings of opposite-parity states have been proposed for use in the study of parity-violating interactions and other applications. We experimentally study a typical manifestation of this system using BaF138. Using a Stark-mixing method for detection, we demonstrate level-crossing signals with spectral width as small as 6 kHz. We use our data to verify the predicted line shapes, transition dipole moments, and Stark shifts and to precisely determine molecular magnetic g factors. Our results constitute an initial proof of concept for use of this system to study nuclear spin-dependent parity-violating effects.
authors.affiliation: Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520, USA.
authors.forename: S B
authors.initials: SB
authors.lastname: Cahn
authors.affiliation: Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520, USA.
authors.forename: J
authors.initials: J
authors.lastname: Ammon
authors.affiliation: Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520, USA.
authors.forename: E
authors.initials: E
authors.lastname: Kirilov
authors.affiliation: Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520, USA.
authors.forename: Y V
authors.initials: YV
authors.lastname: Gurevich
authors.affiliation: Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520, USA.
authors.forename: D
authors.initials: D
authors.lastname: Murphree
authors.affiliation: Department of Science, U.S. Coast Guard Academy, 31 Mohegan Avenue, New London, Connecticut 06320, USA.
authors.forename: R
authors.initials: R
authors.lastname: Paolino
authors.affiliation: Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Rahmlow
authors.affiliation: Petersburg Nuclear Physics Institute, Gatchina 188300, Russia.
authors.forename: M G
authors.initials: MG
authors.lastname: Kozlov
authors.affiliation: Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520, USA.
authors.forename: D
authors.initials: D
authors.lastname: DeMille