Zeeman-tuned rotational level-crossing spectroscopy in a diatomic free radical

S. B. Cahn, J. Ammon, E. Kirilov, Y. V. Gurevich, D. Murphree, R. Paolino, D. A. Rahmlow, M. G. Kozlov, D. Demille

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


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.

Original languageEnglish (US)
Article number163002
JournalPhysical Review Letters
Issue number16
StatePublished - Apr 25 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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