Optical spectroscopy of tungsten carbide for uncertainty analysis in electron electric-dipole-moment search
Optical spectroscopy of tungsten carbide for uncertainty analysis in electron electric-dipole-moment search
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DOI：
10.1103/physreva.87.022516
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发表时间：
2012-12
影响因子：
2.9
通讯作者：
J. Lee;J. Chen;L. Skripnikov;A. Petrov;A. Titov;N. Mosyagin;A. Leanhardt
中科院分区：
文献类型：
--
作者：
J. Lee;J. Chen;L. Skripnikov;A. Petrov;A. Titov;N. Mosyagin;A. Leanhardt
我们对碳化钨（WC）分子的脉冲超声束进行了激光诱导荧光（LIF）光谱，该分子已被提议作为永久电偶极距（EDM）搜索电子的候选分子系统，其振转基态为X3 Delta 1状态。特别地，[20.6]Omega=2，v '= 4 <-X3 Δ 1，v”=0跃迁在485 nm处用于检测。测量了跃迁的超精细结构和欧米加双重态，这对于估计EDM测量的潜在系统不确定度的大小是必不可少的。为了进一步抑制系统的不确定性，一个替代的电子EDM测量方案，利用Ω双重能级的g因子交叉点进行了讨论。另一方面，通量和内部温度的分子束的特点，这设置了限制的统计不确定性的电子EDM实验。最后，对WC分子X3 δ 1态电火花加工实验的前景进行了展望。
We perform laser induced fluorescence(LIF) spectroscopy on a pulsed supersonic beam of tungsten carbide(WC) molecules, which has been proposed as a candidate molecular system for a permanent Electric Dipole Moment(EDM) search of the electron in its rovibrational ground state of the X3Delta1 state. In particular, [20.6]Omega=2, v'=4 <- X3Delta1,v"=0 transition at 485nm was used for the detection. The hyperfine structure and the Omega-doublet of the transition are measured, which are essential for estimating the size of the potential systematic uncertainties for electron EDM measurement. For further suppression of the systematic uncertainty, an alternative electron EDM measurement scheme utilizing the g factor crossing point of the Omega-doublet levels is discussed. On the other hand, flux and internal temperature of the molecular beam are characterized, which sets the limit on the statistical uncertainty of the electron EDM experiment. With the given results, the prospect of electron EDM experiment with the X3Delta1 state of WC molecule is discussed.