Creating Cold Molecules to Constrain the Evolution of the Fine Structure Constant

Details Creating Cold Molecules to Constrain the Evolution of the Fine Structure Constant Creating Cold Molecules to Constrain the Evolution of the Fine Structure Constant

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aps..dmp.h6106l&link_type=abstract

American Physical Society, 36th Meeting of the Division of Atomic, Molecular and Optical Physics, May 17-21, 2005, abstract #H6.

Physics

Scientific paper

Theories that try to unify gravity with the other fundamental forces predict variations in the fundamental constants over time, including the fine structure constant. Comparing measurements of OH transition frequencies at cosmological distances with laboratory based measurements can give a limit of the time variation of the fine structure constant. We create cold OH molecules by using the phenomenon of supersonic expansion to cool the molecules and the Stark effect to slow the resulting molecules for precision spectroscopic measurements. We have made the most precise measurements of microwave transitions in the ground state of OH to complement the astronomical observations.

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