arXiv: Atomic Physics

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The influence of the blackbody radiation field on the gfactor of light hydrogenlike ions is considered within the framework of quantum electrodynamics at finite temperature for bound states. One-loop thermal corrections are examined for a wide range of temperatures. The numerical results for 1s 2s 2p_{1/2} and 2p_{3/2}states are presented. It is shown that for excited states finite temperature corrections to the bound-electron gfactor are close to the level of current experimen...

We present a measurement of the hydrogen 2_{1/2}-8_{5/2}transition performed with a cryogenic atomic beam. The measured resonance frequency is \nu=770649561570.9(2.0)kHz, which corresponds to a relative uncertainty of 2.6\times10^{-12} Combining our result with the most recent measurement of the 1-2 transition, we find a proton radius of r_p=0.8584(51)fm and a Rydberg constant of R_\infty=10973731.568332(52)m^{-1} This result has a combined 3.1~\sigmadisagreement...

Atomic fountain clocks launch laser-cooled balls of atoms upwards to some height hin the local gravitational field where they experience both second-order Doppler shifts and gravitational frequency shifts. It is shown in this paper that the net shift, relative to a reference at the launch point, is g h/3 c^2 We derive the next most significant correction to this expression, and show that the value of gshould be corrected for Coriolis and centripetal effects.

High-harmonic generation (HHG) in solids has emerged in recent years as a rapidly expanding and interdisciplinary field, attracting attention from both the condensed-matter and the atomic, molecular, and optics communities. It has exciting prospects for the engineering of new light sources and the probing of ultrafast carrier dynamics in solids, and the theoretical understanding of this process is of fundamental importance. This tutorial provides a hands-on introduction to the theoretical descri...

Tunneling ionization is a basic process of strong-field atomic physics. Revealing its time-resolved dynamics is one of the goals of attosecond science. Here, we show that after tunneling, a finite response time (about 100 attoseconds) is needed for the electronic state to evolve into an ionized state. We construct a semiclassical model with a compact expression to describe this response time. With this expression, a simple Coulomb-calibrated mapping relation between time and observables is obtai...

Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation.

In ultracold-atom and ion experiments, flexible control of the direction and amplitude of a uniform magnetic field is necessary. It is achieved almost exclusively by controlling the current flowing through coils surrounding the experimental chamber. Here, we present the design and characterization of a modular, analog electronic circuit that enables three-dimensional control of a magnetic field via the amplitude and direction of a current flowing through three perpendicular pairs of coils. Each ...

Sensitivity improvement of Rydberg atom-based microwave sensing via electromagnetically induced transparency.

A highly excited Rydberg atom via electromagnetically induced transparency with two color cascading lasers has extreme sensitivity to electric fields of microwave ranging from 100 MHz to over 1 THz. It can be used as susceptible atom-based microwave communication antennas where the carrier wave usually works exactly resonant to the transition between a pair of adjacent Rydberg states with large electric dipole moment. A technique of superheterodyne with a strong on-resonant local microwave oscil...

Inelastic collision dynamics between isolated gas-phase carbon monoxide molecules and low energetic electrons (< 50 eV) has been studied using state-of-the-art velocity map imaging apparatus and reported previously. These were based on data analysis using the time-gated parallel slicing technique, which has recently revealed the drawback of lower momentum ion exaggeration mainly due to the inclusion of whole Newton sphere's of diameter \leparallel slicing time window. To overcome this drawbac...

An accurate evaluation of the gravity acceleration from the timing of free fall of anti-hydrogen atoms in the GBAR experiment requires to account for obstacles surrounding the anti-matter source. These obstacles reduce the number of useful events but may improve accuracy since the edges of the shadow of obstacles on the detection chamber depends on gravity, bringing additional information on the value of g We perform Monte Carlo simulations to obtain the dispersion and give a qualitative unde...

Phase lag associated with coherent control where an excited system decays into more than one product channel has been subjected to numerous investigations. Although previous theoretical studies have treated the phase lag across resonances in model calculations, quantitative agreement has never been achieved between the theoretical model and experimental measurements of phase lag from the \omega-2\omegaionization of atomic barium \cite{PhysRevLett.98.053001,PhysRevA.76.053401}, suggesting that...

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