arXiv: Atomic Physics

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Here, we report on the nonlinear ionization of argon atoms in the short wavelength regime using ultraintense x rays from the European XFEL. After sequential multiphoton ionization, high charge states are obtained. For photon energies that are insufficient to directly ionize a 1selectron, a different mechanism is required to obtain ionization to Ar^{17+} We propose this occurs through a two-color process where the second harmonic of the FEL pulse resonantly excites the system via a $1s \rig...

Optical atomic clocks are our most precise tools to measure time and frequency. They enable precision frequency comparisons between atoms in separate locations to probe the space-time variation of fundamental constants, the properties of dark matter, and for geodesy. Measurements on independent systems are limited by the standard quantum limit (SQL); measurements on entangled systems, in contrast, can surpass the SQL to reach the ultimate precision allowed by quantum theory - the so-called Heise...

The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen (\mu) with 1 ppm accuracy by means of pulsed laser spectroscopy to determine the two-photon-exchange contribution with 2\times10^{-4}relative accuracy. In the proposed experiment, the \mu atom which undergoes a laser excitation from the singlet hyperfine state to the triplet hyperfine state, is quenched back to the singlet state by an inelastic collision with a H_2molecu...

Effect of laser polarization on atomic and ionic emission in laser induced breakdown spectroscopy (LIBS).

Laser induced breakdown spectroscopy (LIBS) has become a proven contemporary workhorse for qualitative and quantitative analysis of materials. Recent developments in LIBS have been limited either to signal enhancement strategies or to advances in data analysis techniques that yield better interpretation of LIBS data. Explorations of the initial laser excitation stage of LIBS remain somewhat restricted. In particular, the influence, if any, of the polarization state of excitation laser remains un...

For experiments that require a quantum system to be in the ultra-cold regime, laser cooling isan essential tool. While techniques for laser cooling ions and neutral atoms have been refined andtemperatures below the Doppler limit have been achieved, present-day techniques are limited toa small class of molecules. This paper proposes a general cooling scheme for molecules based onvibrational-state transitions. Superradiance is used to speed up the two-photon transition. Sim-ulations of this scheme...

Rotating and vibrating symmetric top molecule RaOCH_3in the fundamental \mathcal{P} \mathcal{T}violation searches.

We study the influence of the rotations and vibrations of the symmetric top RaOCH_3molecule on its effectiveness as a probe for the \mathcal{P}and \mathcal{T}violating effects, such as the electron electric dipole moment (eEDM) and the scalar-pseudoscalar electron-nucleon interaction (Ne-SPS). The corresponding sensitivity parameters E_{\rm eff}and E_{\rm s}are computed for the ground and first excited rovibrational states with different values of the angular momentum component $K...

Ongoing experimental efforts to measure with unprecedented precision electron capture probabilities will challenge the current theoretical models. The short range of the weak interaction necessitates an accurate description of the atomic structure down to the nucleus region. In this study, an atomic modeling has been developed in the framework of the relativistic density functional theory within which several exchange-correlation functionals and self-interaction-corrected models have been explor...

Measurements of blackbody radiation-induced transition rates between high-lying S, P and D Rydberg levels.

We report experimental measurements of the rates of blackbody radiation-induced transitions between high-lying (n>60) S, P and D Rydberg levels of rubidium atoms in a magneto-optical trap using a hybrid field ionization and state-selective depumping technique. Our results reveal significant deviations of the measured transition rates from theory for well-defined ranges of the principal quantum number. We assume that the most likely cause for those deviations is a modified blackbody spectrum insi...

When three particles in three dimensions interact with a short-range potential fine-tuned to an infinite scattering length, they form an infinite sequence of loosely bound states obeying discrete scale invariance known as Efimov states. Here we show that analogous states are formed by three charged particles in one, two, and three dimensions without any fine-tuning. Our finding is based on the Born-Oppenheimer approximation assuming that two particles carrying the same charge are much heavier th...

The generation of long-lived entanglement on an optical clock transition is a key requirement to unlocking the promise of quantum metrology. Arrays of neutral atoms constitute a capable quantum platform for accessing such physics, where Rydberg-based interactions may generate entanglement between individually controlled and resolved atoms. To this end, we leverage the programmable state preparation afforded by optical tweezers along with the efficient strong confinement of a 3d optical lattice t...

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