Observation of large frequency shifts of the electron paramagnetic resonance of Rb 87 atoms due to collisions with cell walls coated with RbH salt

Emily Ulanski, Zhen Wu

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3 Scopus citations

Abstract

We report an observation of large frequency shifts on the order of several hundred Hz of the electron paramagnetic resonance (EPR) of the gas phase alkali-metal atoms (Rb87) in a millimeter-sized cell coated with RbH salt. We provide convincing evidence that the observed EPR frequency shift is due to collisions with RbH-coated cell walls. The RbH coating is nuclear spin polarized by spin exchange with optically pumped Rb87 vapor, and the observed frequency shift is caused by the Fermi contact interaction between the s electron of the adsorbed Rb87 atom and the polarized nucleus on the salt surface. From the measured EPR frequency shift we calculated the ensemble-averaged phase shift δφs experienced by the spin polarized Rb87 atoms while adsorbed on the surface. Under our experimental conditions, we found the average phase shift δφs∼70mrad.

Original languageEnglish (US)
Article number053431
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume89
Issue number5
DOIs
StatePublished - May 30 2014

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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