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Physics

Atomic / Molecular / Quantum

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Displaying 376 - 400 of 702

Measurements of the Linear Polarization of Satellite Transitions from Li- and Be- like Ar Ions

June 18, 2020
Author(s)
Amy Gall, Dipti Goyal, Sean W. Buechele, Samuel C. Sanders, Roshani Silwal, Csilla Szabo-Foster, N Brickhouse, Yuri Ralchenko, Endre A. Takacs
Non-thermal electron distributions, such as beams of electrons, are found in many laboratory and astrophysical plasma sources and can produce anisotropic and polarized emission. Theories used to model the emission require sublevel specific analysis, which

Determination of the isotopic change in nuclear charge radius from extreme-ultraviolet spectroscopy of highly charged ions of Xe

June 16, 2020
Author(s)
Yuri Ralchenko, Roshani Silwal, A. Lapierre, John Gillaspy, Joan M. Dreiling, S A. Blundell, Dipti Goyal, A. Borovik, Jr., G Gwinner, A.C.C. Villari, Endre Takacs
The electron beam ion trap (EBIT) at the National Institute of Standards and Technology was employed to measure the isotopic shift of the Na-like D 3s 2S1=2 3p 2P1=2;3=2, Mg-like 3s2 1S0 3s3p 1P1, Mg-like 3s2 1S0 3s3p 3P1, Al-like 3s23p 2P1=2 3s23p 2P3=2

Realization of a stroboscopic optical lattice for cold atoms with subwavelength spacing

June 9, 2020
Author(s)
TC Tsui, Yang Wang, Sarthak Subhankar, James V. Porto, Steve Rolston
Optical lattices are typically created via the ac-Stark shift, which are limited by diffraction to periodicities ≥ λ/2, where λ is the wavelength of light used to create them. Lattices with smaller periodicities may be useful for many-body physics with

Spectroscopic analysis of N-intrashell transitions in Rb-like to Ni-like Yb ions

June 9, 2020
Author(s)
Dipti Goyal, R. Silwal, Joan M. Dreiling, Samuel C. Sanders, Endre A. Takacs, Yuri Ralchenko
Extreme ultraviolet spectra of highly-charged ytterbium ions produced in an electron beam ion trap at National Institute of Standards and Technology were observed with a at- eld grazing incidence spectrometer in the wavelength region of about 4 nm to 20 nm

Creating solitonic excitations with controllable velocity in Bose-Einstein condensates

May 20, 2020
Author(s)
Amilson R. Fritsch, Mingwu Lu, Alina M. Pineiro Escalera, Graham H. Reid, Ian Spielman
Established techniques for deterministically creating dark solitons in repulsively interacting atomic Bose-Einstein condensates (BECs) can only access a narrow range of soliton velocities. Because velocity a ects the stability of individual solitons and

Linear Polarization of Anisotropically Excited X-ray Lines from the n=2 Complex in He-like Ar16+

May 13, 2020
Author(s)
Dipti Goyal, Sean W. Buechele, Amy C. Gall, Samuel C. Sanders, Csilla I. Szabo-Foster, Roshani Silwal, Endre A. Takacs, Yuri Ralchenko
High-resolution x-ray spectra were recorded at the National Institute of Standards and Technology (NIST) electron beam ion trap (EBIT) using two Johann-type crystal spectrometers, with their dispersion planes oriented parallel and perpendicular to the beam

Open-system tensor networks and Kramers' crossover for quantum transport

May 12, 2020
Author(s)
Gabriela Wojtowicz, Justin E. Elenewski, Marek Rams, Michael P. Zwolak
Tensor networks are a powerful tool for many-body ground-states with limited entanglement. These methods can nonetheless fail for certain time-dependent processes - such as quantum trans- port or quenches - where entanglement growth is linear in time

Ion transport across solid-state ion channels perturbed by directed strain

April 28, 2020
Author(s)
Alexander Smolyanitsky, Alta Y. Fang, Andrei Kazakov, Eugene Paulechka
We combine quantum-chemical calculations and molecular dynamics simulations to consider aqueous ion flow across non-axisymmetric nanopores in monolayer graphene and MoS2. When the pore-containing membrane is subject to uniaxial tensile strains applied in

Dielectronic resonances of LMn and LNn (? 4) series in highly-charged M-shell tungsten ions

March 4, 2020
Author(s)
Dipti Goyal, A. Borovik, Jr., R. Silwal, Joan M. Dreiling, Amy C. Gall, Endre Takacs, Yuri Ralchenko
We present accurate spectroscopic measurements and detailed theoretical analysis of inner-shell LM$n$ and LN$n$ ($n$ $\geq$ 4) dielectronic resonances (DR) in highly-charged M-shell ions of tungsten. The x-ray emission from W$^49+}$ through W$^64+}$ was

Atomic flux circuits

February 23, 2020
Author(s)
Douglas Bopp, Ellyse Taylor, Khoa Le, Susan Schima, Matthew Hummon, John Kitching
Atomic vapors are a crucial platform for precision metrology but in their simplest implementation, a thermal vapor, the intrinsic optical resonances are broadened due to the random and isotropic thermal motion of the atoms. By structuring the container of
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