Selected Recent Publications:

Atomic Electric Dipole Moment (EDM) & Related Topics

• "New Limit on the Permanent Electric Dipole Moment of ¹⁹⁹Hg",
  M. V. Romalis, W. C. Griffith, J. P. Jacobs, and E. N. Fortson, Phys. Rev. Lett. 86, 2505-2508 (2001).
  (PDF version, 665 kB) _.
• "Measurement of the scalar Stark shift of the 6¹S₀ --> 6³P₁ transition in Hg",
  D. M. Harber and M. V. Romalis, Phys. Rev. A 63, 013402 (2001).
  (PDF version, 86 kB) _.
• "Zeeman frequency shifts in an optical dipole trap used to search for an electric-dipole moment",
  M. V. Romalis and E. N. Fortson, Phys. Rev. A 59, 4547-4558 (1999).
  (PDF version, 246 kB) _.
• "Limit on the electric-dipole moment of ¹⁹⁹Hg using synchronous optical pumping",
  J. P. Jacobs, W. M. Klipstein, S. K. Lamoreaux, B. R. Heckel and E. N. Fortson, Phys. Rev. A 52, 3521-3540 (1995).
  (PDF version, 1914 kB) _.
• "Measurement of a linear Stark interference effect on the rubidium D1 absorption line",
  X. Chen, F. R. Huang-Hellinger, B. R. Heckel, and E. N. Fortson, Phys. Rev. A 50 4729 (1994).
  (PDF version, 335 kB) _.
• "Testing time-reversal symmetry using ¹⁹⁹Hg",
  J. P. Jacobs, W. M. Klipstein, S. K. Lamoreaux, B. R. Heckel and E. N. Fortson, Phys. Rev. Lett. 71 3782-3785 (1993).
  (PDF version, 425 kB) _.
• "Calculation of a linear Stark effect on the 254-nm line of Hg",
  S. K. Lamoreaux and E. N. Fortson Phys. Rev. A 46, 7053-7059 (1992).
  (PDF version, 432 kB) _.
• "New constraints on time-reversal asymmetry from a search for a permanent electric dipole moment of ¹⁹⁹Hg",
  S. K. Lamoreaux, J. P. Jacobs, B. R. Heckel, F. J. Raab, and N. Fortson, Phys. Rev. Lett. 59 2275-2278 (1987).
  (PDF version, 354 kB) _.

Atomic Parity Non-Conservation (PNC)

• "Precision measurement of light shifts in a single trapped Ba⁺ ion",
  J. A. Sherman, T. W. Koerber, A. Markhotok, W. Nagourney, and E. N. Fortson, Phys. Rev. Lett. 94, 243001/1-4 (2005).
  (PDF version, 296 kB) _.
• "Radio frequency spectroscopy with a trapped Ba⁺ ion: recent progress and prospects for measuring parity violation",
  T. W. Koerber, M. H. Schacht, W. Nagourney, and E. N. Fortson, J. Phys. B. 36, 637-648 (2003).
  (PDF version, 172 kB) _.
• "rf Spectroscopy with a Single Ba⁺ Ion",
  T. W. Koerber, M. H. Schacht, K. R. G. Hendrickson, W. Nagourney, and E. N. Fortson, Phys. Rev. Lett.. 88, 143002 (2002).
  (PDF version, 104 kB) _.
• "Studies of electromagnetically induced transparency in thallium vapor and possible utility for measuring atomic parity non-conservation",
  A. D. Cronin, E. N. Fortson, S. K. Lamoreaux and R. B. Warrington, Phys. Rev. Lett. 80, 3719-3722 (1998).
  (PDF version, 133 kB) _.
• "Precise test of electroweak theory from a new measurement of parity nonconservation in atomic thallium",
  P. A. Vetter, D. M. Meekhof, P. K. Majumder, S. K. Lamoreaux and E. N. Fortson, Phys. Rev. Lett. 74, 2658-2661 (1995).
  (PDF version, 146 kB) _.
• "Optical-rotation technique used for a high-precision measurement of parity nonconservation in atomic lead",
  D. M. Meekhof, P. A. Vetter, P. K. Majumder, S. K. Lamoreaux and E. N. Fortson, Phys. Rev. A 52, 1895-1908 (1995).
  (PDF version, 1417 kB) _.
• "High-precision measurement of parity nonconserving optical rotation in atomic lead",
  D. M. Meekhof, P. Vetter, P. K. Majumder, S. K. Lamoreaux and E. N. Fortson, Phys. Rev. Lett. 71, 3442-3445 (1993).
  (PDF version, 424 kB) _.
• "Possibility of measuring parity non-conservation with a single trapped atomic ion",
  N. Fortson, Phys. Rev. Lett. 70, 2383-2386 (1993).
  (PDF version, 368 kB) _.

Ytterbium Trapping

• "Observation of the ¹S₀--³P₀ transition in atomic ytterbium for optical clocks and qubit arrays",
  Tao Hong, Claire Cramer, Eryn Cook, Warren Nagourney, and E. N. Fortson, Optics Letters 30, 2644-2646 (2005).
  (PDF version, 88 kB) _.
• "Optical clocks based on ultranarrow three-photon resonances in alkaline earth aatoms",
  Tao Hong, Claire Cramer, Warren Nagourney, and E. N. Fortson, Phys. Rev. Lett. 94, 050801/1-4 (2005).
  (PDF version, 64 kB) _.
• "Possibility of an optical clock using the 6 ¹S₀-->6  ³P^o₀ transition in ^171,173Yb atoms held in an optical lattice",
  S. G. Porsev, A. Derevianko, and E. N. Fortson, Phys. Rev. A 69, 021403/1-4 (2004).
  (PDF version, 64 kB) _.
• "Investigation of sub-Doppler cooling in an ytterbium magneto-optical trap",
  R. Maruyama, R. H. Wynar, M. V. Romalis, A. Andalkar, M. D. Swallows, C. E. Pearson, and E. N. Fortson, Phys. Rev. A 68, 011403/1-4 (2003).
  (PDF version, 207 kB) _.

Spontaneous Polarization & Related Topics

• "Experimental and Theoretical Study of Spontaneous Spin Polarization and Hysteresis in Cesium Vapor",
  A. Andalkar, R. B. Warrington, M. V. Romalis, S. K. Lamoreaux, B. R. Heckel, and E. N. Fortson, Phys. Rev. A 65, 023407 (2002).
  (PDF version, 431 kB) _.
• "High-Resolution Measurement of the Pressure Broadening and Shift of the Cs D1 and D2 Lines by N₂ and He Buffer Gases",
  A. Andalkar and R. B. Warrington, Phys. Rev. A 65, 032708 (2002).
  (PDF version, 88 kB) _.
• "Improved external cavity design for cesium D1 (894 nm) diode laser",
  A. Andalkar, R. B. Warrington, and S. K. Lamoreaux, Rev. Sci. Instrum 71, 4029-4031 (2000).
  (PDF version, 308 kB) _.
• "Observation of spontaneous spin polarization in an optically pumped cesium vapor",
  W. M. Klipstein, S. K. Lamoreaux and E. N. Fortson, Phys. Rev. Lett. 76, 2266-2269 (1996).
  (PDF version, 129 kB) _.
• "Spontaneous spin polarization and bistability in atomic vapors by optical pumping with unpolarized light",
  E. N. Fortson and B. R. Heckel, Phys. Rev. Lett. 59, 1281-1284 (1987).
  (PDF version, 283 kB) _.

Other Precision Measurements

• "Demonstration of the Casimir force in the 0.6 to 6 µm range",
  S. K. Lamoreaux, Phys. Rev. Lett. 78, 5-8 (1997).
  (PDF version, 143 kB) _.
• "Search for a coupling of the Earth's gravitational field to nuclear spins in atomic mercury",
  B. J. Venema, P. K. Majumder, S. K. Lamoreaux, B. R. Heckel, and E. N. Fortson, Phys. Rev. Lett. 68 135-138 (1992).
  (PDF version, 360 kB) _.
• "Test of the linearity of quantum mechanics in optically pumped ²⁰¹Hg",
  P. K. Majumder, B. J. Venema, S. K. Lamoreaux, B. R. Heckel, and E. N. Fortson, Phys. Rev. Lett. 65 2931-2934 (1990).
  (PDF version, 360 kB) _.

Recent Conference Abstracts:

• Precise measurements of light-shifts in a single trapped ¹³⁸Ba⁺ ion _.
• Radio-frequency spectroscopy with a trapped ¹³⁷Ba⁺ ion _.
• The search for the permanent electric dipole moment of ¹⁹⁹Hg _.
• Prospects for an optical frequency standard in atomic Yb _.
• Progress toward a neutral Yb frequency standard _.

• Sisyphus Cooling in Ytterbium Intercombination MOT _.
• Progress Toward an Improved Limit on the Permanent Electric Dipole Moment of ¹⁹⁹Hg _.
• Noise and Systematics in the ¹⁹⁹Hg Electric Dipole Moment Search _.
• RF spectroscopy with a trapped Ba⁺ ion: recent results _.

• A Four Vapor Cell Search for the Permanent Electric Dipole Moment of ¹⁹⁹Hg _.
• Investigation of an Ytterbium MOT Using an Intercombination Transition _.

• Limiting CP violation through a search for the permanent EDM of ¹⁹⁹Hg _.
• AC-stark shift measurements in a single trapped Ba ion _.
• Precise measurement of the (6s6p²)\:⁴P_1/2 state hyperfine splitting in atomic thallium _.

• Search for a permanent EDM in ¹⁹⁹Hg _.
• Spontaneous Polarization in Cesium Vapor: Theoretical Modelling and Comparison with Experimental Data _.

• Quantitative Analysis of Spontaneous Polarization in Cesium _.
• Trapping of Ytterbium Atoms for an EDM Experiment _.
• Search for a permanent EDM in ¹⁹⁹Hg _.
• Progress towards an Atomic PNC measurement in singly trapped Ba⁺ _.

• Search for a Permanent EDM in Diamagnetic Atoms _.
• Spontaneous Polarization in Cesium Vapor _.

• Progress toward precision measurements using electromagnetically induced transparency in thallium _.
• Measurements with Ba ion PNC (Parity Nonconservation) apparatus _.
• Spontaneous polarization in cesium using linearly polarized light _.
• Improved external cavity diode laser system for cesium D1 (894 nm) _.
• Progress toward the next generation of Hg EDM experiment _.
• Trapping Yb atoms for an EDM experiment _.
• Shifts of the Zeeman transition frequency in a far-off-resonance dipole trap _.

• Progress towards a new measurement technique for parity non-conservation in Tl _.
• Apparatus for measuring PNC on a single trapped Ba ion _.
• First measurements with Ba PNC apparatus _.
• Spontaneous polarization with linearly polarized light: theory _.
• Spontaneous polarization with linearly polarized light: experiment _.