Abstract
We propose a precision measurement of time variations of the proton-electron mass ratio using ultracold molecules in an optical lattice. Vibrational energy intervals are sensitive to changes of the mass ratio. In contrast to measurements that use hyperfine-interval-based atomic clocks, the scheme discussed here is model independent and does not require separation of time variations of different physical constants. The possibility of applying the zero-differential–Stark-shift optical lattice technique is explored to measure vibrational transitions at high accuracy.
- Received 13 August 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.043201
©2008 American Physical Society