The method and status of a study to provide numerical, high-precision values of the self-energy level shift in hydrogen and hydrogen-like ions is described. Graphs of the self energy in hydrogen-like ions with nuclear charge number between 20 and 110 are given for a large number of states. The self-energy is the largest contribution of Quantum Electrodynamics (QED) to the energy levels of these atomic systems. These results greatly expand the number of levels for which the self energy is known with a controlled and high precision. Applications include the adjustment of the Rydberg constant and atomic calculations that take into account QED effects.
Extraction of the electron mass from $g$ factor measurements on light hydrogenlike ions
从潘宁陷阱测量与$^{12}$ C $^{5+}$离子和从理论结果的束缚电子$g$因素的电子质量的测定进行了详细描述。一些最近计算的贡献稍微移动提取的质量值。从实验和理论两方面讨论了进一步提高电子质量的前景。用$^4$ He $^+$离子进行的测量将使电子质量值的一致性检查成为可能，并且在将来改进$^4$ He核质量和确定精细结构常数。
We present new sum rules for $3jm$ coefficients, which involve, in addition to the usual weighting factor $(2j + 1)$ where $j$ is an angular momentum, the quantity $[j(j + 1)]^k$ with $k \ge 1$. The sum rules appear for instance in the statistical modeling of rotational spectra within the theory of moments, and enable one to deduce the expectation values of $r^k$ (used in the theory of Stark effect for hydrogenic ions) in parabolic coordinates from the expectation values of $r^k$ in spherical coordinates.
Three-dimensional (3D) excitonic complexes influence the optoelectronic properties of bulk semiconductors. More generally, correlated few-particle molecules and ions, held together by pairwise Coulomb potentials, play a fundamental role in a variety of fields in physics and chemistry. Based on statistically exact diffusion quantum Monte Carlo calculations, we have studied excitonic three- and four-body complexes (trions and biexcitons) in bulk 3D semiconductors as well as a range of small molecules and ions in which the nuclei are treated as quantum particles on an equal footing with the elect…
Recent progresses on quantum control of cold atoms and trapped ions in both the scientific and technological aspects greatly advance the applications in precision measurement. Thanks to the exceptional controllability and versatility of these massive quantum systems, unprecedented sensitivity has been achieved in clocks, magnetometers and interferometers based on cold atoms and ions. Besides, these systems also feature many characteristics that can be employed to facilitate the applications in different scenarios. In this review, we briefly introduce the principles of optical clocks, cold atom…
我们讨论的技术，允许长的相干时间在激光光谱实验与两个被困离子。我们表明，为了这个目的，不仅纠缠的离子中制备的消相干的子空间可以使用，但也是一对离子，不纠缠，但受到相同的相位噪声。我们将此技术应用于测量~（40）Ca ~（++）3d D ~（5/2）态的电四极矩和测量激发一对~（40）Ca ~（++）离子的超稳激光的线宽。
