共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
We analyze the CP-violating electric dipole form factor of the nucleon in the framework of covariant baryon chiral perturbation theory. We give a new upper bound on the vacuum angle, |θ0|?2.5×10−10. The quark mass dependence of the electric dipole moment is discussed and compared to lattice QCD data. We also perform the matching between its representations in the three- and two-flavor theories. 相似文献
3.
In this Letter, we obtain the quantum holonomies for a neutral particle with a permanent electric dipole moment based on the analogue effects of the He-McKellar-Wilkens effect and the Scalar Aharonov-Bohm effect and show a new proposal for implementing one-qubit quantum gates. 相似文献
4.
Arata Murakami Keizo Fujimaki Shigeki Inoue Nobuhiko Kuze Takeshi Sakaizumi Ponmalai G. Kolandaivel Osamu Ohashi 《Journal of Molecular Spectroscopy》2005,230(2):125-132
The microwave spectra of cyclopentanone oxime (C5H8NOH) and its deuterated species (C5H8NOD) were observed in the frequency region from 9 to 40 GHz. Only a-type R-branch transitions were assigned in the vibrational ground and excited states. The rotational constants of normal species were determined to be A = 5870.80(33), B = 1917.021(8), and C = 1526.784(8) MHz in the vibrational ground state, and A = 5870.16(43), B = 1842.707(9), and C = 1479.401(9) MHz for deuterated species. The dipole moments were determined as μa = 0.80(10), μb = 0.20(10), and μc = 0.40(10) D. The ring-puckering vibrational states were observed up to v = 6. The vibrational mode was nearly harmonic. The fundamental frequency of the ring-puckering mode was found to be 70(20) cm−1. The molecular structure of cyclopentanone oxime was determined to be a twisted configuration by comparing the observed and calculated rotational constants, planar moment of inertia, Pcc, and rs coordinates of the hydroxyl hydrogen atom. On the molecular geometry, the bond angle, C2C1N6 (Fig. 1), is larger than C5C1N6 by ca. 6°, because of the steric repulsion between the methylene group of C2 atom and hydroxyl group. 相似文献
5.
A.D. Alhaidari 《Annals of Physics》2008,323(7):1709-1728
We relax the usual diagonal constraint on the matrix representation of the eigenvalue wave equation by allowing it to be tridiagonal. This results in a larger representation space that incorporates an analytic solution for the non-central electric dipole potential cosθ/r2, which was believed not to belong to the class of exactly solvable potentials. Therefore, we were able to obtain a closed form solution of the three-dimensional time-independent Schrödinger equation for a charged particle in the field of a point electric dipole that could carry a nonzero net charge. This problem models the interaction of an electron with a molecule (neutral or ionized) that has a permanent electric dipole moment. The solution is written as a series in a basis composed of special functions that support a tridiagonal matrix representation for the angular and radial components of the wave operator. Moreover, this solution is for all energies, the discrete (for bound states) as well as the continuous (for scattering states). The expansion coefficients of the radial and angular components of the wavefunction are written in terms of orthogonal polynomials satisfying three-term recursion relations. For the Coulomb-free case, where the molecule is neutral, we calculate critical values for its dipole moment below which no electron capture is allowed. These critical values are obtained not only for the ground state, where it agrees with already known results, but also for excited states as well. 相似文献
6.
G. Ban K. Bodek M. Daum R. Henneck S. Heule M. Kasprzak N. Khomytov K. Kirch A. Knecht S. Kistryn P. Knowles M. Kuzniak T. Lefort O. Naviliat-Cuncic A. Pichlmaier C. Plonka G. Quémener M. Rebetez D. Rebreyend G. Rogel B. M. Sabirov M. Tur A. Weis J. Zejma 《Hyperfine Interactions》2006,172(1-3):41-43
Precision measurements of particle electric dipole moments (EDMs) provide extremely sensitive means to search for non-standard
mechanisms of T (or CP) violation. For the neutron EDM, the upper limit has been reduced by eight orders of magnitude in 50 years
thereby excluding several CP violation scenarios. We report here on a new effort aiming at improving the neutron EDM limit
by two orders of magnitude, down to a level of 3 × 10−28 e·cm. The two central elements of the approach are the use of the higher densities which will be available at the new dedicated
spallation UCN source at the Paul Scherrer Institute, and the optimization of the in-vacuum Ramsey resonance technique, with
storage chambers at room temperature, to reach new limits of sensitivity. 相似文献
7.
We present the first results of a new search for a permanent electric dipole moment of the 199Hg atom using a UV laser. Our measurements give d(199Hg) = -(1.06+/-0.49+/-0.40)x10(-28)e cm. We interpret the result as an upper limit absolute value [d(199Hg)]<2.1x10(-28)e cm (95% C.L.), which sets new constraints on theta bar;(QCD), chromo-EDMs of the quarks, and CP violation in supersymmetric models. 相似文献
8.
Andrea Callegari Roman Schmied Thomas R. Rizzo 《Journal of Molecular Spectroscopy》2003,221(1):116-120
Pulsed laser excitation and photofragment detection methods are used to observe the 170,17←161,16 pure rotational transition within the vOH=4 vibrational state of HO35Cl. Microwave frequency and Stark effect measurements give ν0=27484.33(10) MHz and μb=1.562(9) D. The dependence of μb, which is approximately parallel to the OH bond, on the level of OH stretch excitation appears linear and is consistent with that of H2O over the same 0-14 000 cm−1 energy range. 相似文献
9.
The effect of a permanent dipole moment on the polar molecule cavity quantum electrodynamics
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A dressed-state perturbation theory beyond the rotating wave approximation(RWA) is presented to investigate the interaction between a two-level electronic transition of polar molecules and a quantized cavity field. Analytical expressions can be explicitly derived for both the ground- and excited-state-energy spectrums and wave functions of the system, where the contribution of permanent dipole moments(PDM) and the counter-rotating wave term(CRT) can be shown separately.The validity of these explicit results is discussed by comparison with the direct numerical simulation. Compared to the CRT coupling, PDM results in the coupling of more dressed states and the energy shift is proportional to the square of the normalized permanent dipole difference, and a greater Bloch–Siegert shift can be produced in the giant dipole molecule cavity QED. In addition, our method can also be extended to the solution of the two-level atom Rabi model Hamiltonian beyond the RWA. 相似文献
10.
By applying non-equilibrium Green's function formalism combined with density functional theory, we have investigated the electronic transport properties of nitrogen doped fullerene absorbed on the self-assembled alkanethiol monolayer. The molecular dipole moment, which in microscopy leads to the molecule-electrode coupling changing asymmetrically is responsible for the observed molecular rectification. 相似文献
11.
W. Bernreuther 《Zeitschrift fur Physik C Particles and Fields》1992,56(Z1):S97-S100
The forthcoming experiment [1] on the anomalous magnetic moment of the muon will be able to search also for an electric dipole
momentd
μ of the muon with increased sensitivity. A brief survey is given on what various models of CP violation predict ford
μ. 相似文献
12.
The Stark effect of CH3F is extensively used as a calibration standard in laser Stark spectroscopy. The accepted value for the dipole moment of the ground vibrational state of CH3F is less accurate than the precision of laser Stark measurements, and questions have also been raised about the literature value. New molecular beam spectroscopy measurements have been made of the ratio of the Stark effect in the J = 1, K = 1 and J = 2, K = 2 CH3F states to that of the 0110 vibrational state of OCS. The results were and . This produces a dipole moment of 1.85840 D with precision relative to OCS of 10 ppm and absolute accuracy of 43 ppm. 相似文献
13.
G. Li I.E. Gordon P.F. Bernath 《Journal of Quantitative Spectroscopy & Radiative Transfer》2011,112(10):1543-1550
A dipole moment function (DMF) for hydrogen chloride (HCl) has been obtained using a direct fit approach that fits the best available and appropriately weighted experimental data for individual ro-vibrational transitions. Combining wavefunctions derived from the Rydberg-Klein-Rees (RKR) numerical method and a semi-empirical DMF, line intensities were calculated numerically for bands with Δv=0, 1, 2, 3, 4, 5, 6, 7 up to v′=7. The results have demonstrated the effectiveness of inclusion of rotational dipole moment matrix elements and appropriate weighting of the experimental data in the DMF fitting. The new method is shown to be superior to the common method of fitting only the rotationless dipole moment elements, while at the same time being simple to implement. 相似文献
14.
We analyse the bound states for a Landau-type system for an atom with no permanent electric dipole moment subject to a Coulomb-type potential. By comparing the energy levels for bound states of the system with the Landau quantization for an atom with no permanent electric dipole moment (Furtado et al., 2006), we show that the energy levels of the Landau-type system are modified, where the degeneracy of the energy levels is broken. Another quantum effect investigated is a dependence of the angular frequency of the system on the quantum numbers associated with the radial modes and the angular momentum. As examples, we obtain the angular frequency and the energy levels associated with the ground state and the first excited state of the system. 相似文献
15.
Stark effect, in combination with spectral hole burning and single-molecule spectroscopy, has been a fruitful technique to study permanent electric dipole moment of molecules in condensed phase. However, because measuring Stark shifts relies on external fields and narrow line- or hole-widths, the applicability of this method at ambient conditions required by most biological systems has remained limited. Here we demonstrate a new all-optical method for measuring the molecular dipole moment difference between ground and excited states using two-photon absorption (2PA) spectroscopy. We show that the value and orientation of the static dipole moment difference can be determined from the corresponding absolute 2PA cross-section. We use this new method to determine for the first time the strength of local electric field Eloc=0.1-1.0×108 V/cm inside beta-barrel of Fruit series of red fluorescent proteins. Because our method does not rely on external field and is applicable in liquid solutions, it is well suited for the study of biological systems. 相似文献
16.
A permanent electric dipole moment (EDM) of a physical system requires time-reversal (T) and parity (P) violation. Experimental programs are currently pushing the limits on EDMs in atoms, nuclei, and the neutron to regimes of fundamental theoretical interest. Here we calculate the magnitude of the P-, T-violating EDM of 3He and the expected sensitivity of such a measurement to the underlying P-, T-violating interactions. Assuming that the coupling constants are of comparable magnitude for π-, ρ-, and ω-exchanges, we find that the pion-exchange contribution dominates. Our results suggest that a measurement of the 3He EDM is complementary to the planned neutron and deuteron experiments, and could provide a powerful constraint for the theoretical models of the pion–nucleon P-, T-violating interaction. 相似文献
17.
With the idea of evaluating the dipole moment of pentafluorobenzene from a lowJ transition, its microwave spectrum was investigated in the frequency region of 8,000 to 12,400 MHz. The spectrum had been
earlier observed by the authors in the 12,400 to 18,000 MHz region which needs reassignment in the light of present investigations.
The rotational constants areA=1480·856±0·003 MHz,B=1030·066±0·003 MHz andC=607·496±0·002 MHz. The dipole moment is 1·44±0·05 D. 相似文献
18.
里德堡原子由于具有体积大、寿命长、易极化及在外电场中能级易于操控等特点, 已经成为了目前物理学领域研究的热点之一. 本文在磁光阱中实验测量了铯原子15P3/2和16P3/2态的Stark光谱,根据光谱给出了15P3/2和16P3/2|m|=1/2 Stark态在0-1400 V/cm场强范围适用的Stark 能量和偶极矩的经验性解析表达式; 用数值方法求解薛定谔方程获得了这些态的Stark能量、偶极矩和电子几率密度分布. 电子几率密度分布定性说明了计算的偶极矩矢量的方向是正确的. 计算的Stark能量、偶极矩与实验结果相一致. 相似文献
19.
20.
We present here new high-resolution experimental data on the linestrengths and pressure-broadened Lorentzian widths for the P2(13) to R2(12) vibration-rotation lines in the first overtone absorption band of hydrogen iodide. By combining the measured linestrengths with our previous results for the fundamental band [J. Mol. Spectrosc. 218 (2003) 75] and with other published data for the higher-overtone bands of this molecule, an improved dipole moment expansion as a function of the dimensionless reduced nuclear displacement x is obtained: μ(x)=0.4471(5)−0.0772(2)x+0.542(3)x2−1.90(2)x3. This experimental dipole moment function is compared with the results of a few recent non-relativistic and relativistic ab initio calculations. The agreement between theoretical and experimental Herman-Wallis coefficients for the first two vibrational bands of HI is found best as ever reported before. 相似文献