1. Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095, USA
2. CNSI, University of California Los Angeles, Los Angeles, California 90095, USA
3. Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA
4. Department of Physics and Astronomy, University of Waterloo, Waterloo N2L 3G1, Canada
5. UCLA Molecular Instrumentation Center, University of California Los Angeles, Los Angeles, California 90095, USA