An electron electric dipole moment search in the X-3 Delta(1) ground state of tungsten carbide molecules

作者：Lee J; Meyer E R; Paudel R; Bohn J L; Leanhardt A E^*

来源：Journal of Modern Optics, 2009, 56(18-19): 2005-2012.

DOI：10.1080/09500340903349930

• precision measurement
• tungsten carbide
• electron electric dipole moment
• CP-violation
• supersymmetry

We identify the X-3 Delta(1) electronic ground state of tungsten carbide (WC) as a candidate molecular system in which to search for a permanent electric dipole moment (EDM) of the electron. The valence electrons in tungsten carbide experience an effective electric field of order 54 GV cm(-1) when the molecule is placed in a laboratory electric field of just a few mV cm(-1). Currently, a continuous tungsten carbide molecular beam is under construction. Tungsten atoms are evaporated from a resistively heated tungsten filament and are entrained in a noble gas jet containing a small fraction of methane. Tungsten carbide molecules are formed through the reaction W + CH4 -> WC + 2H(2).

• 出版日期2009