Results 51 to 60 of about 100,185 (141)
High accuracy measure of atomic polarizability in an optical lattice clock
, 2011 Despite being a canonical example of quantum mechanical perturbation theory, as well as one of the earliest observed spectroscopic shifts, the Stark effect contributes the largest source of uncertainty in a modern optical atomic clock through blackbody ...
Fox, R. W. +6 more
core +1 more source
Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM
FEBS Letters, EarlyView.Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley +1 more source
Experimental Evaluation of the Blackbody Radiation Shift in the Cesium Atomic Fountain Clock
Applied Sciences, 2022 The cesium atomic fountain clock is the world’s most accurate microwave atomic clock. The uncertainty of blackbody radiation (BBR) shift accounts for an increasingly large percentage of the uncertainty associated with fountain clocks and has become a key
Fan Yang +10 more
doaj +1 more source
A mathematical model for the atomic clock error in case of jumps
, 2015 We extend the mathematical model based on stochastic differential equations describing the error gained by an atomic clock to the cases of anomalous behavior including jumps and an increase of instability. We prove an exact iterative solution that can be
Tavella, Patrizia, Zucca, Cristina
core +1 more source
Atomic Properties of Lu$^+$ [PDF]
, 2016 Singly ionised Lutetium has recently been suggested as a potential clock candidate. Here we report a joint experimental and theoretical investigation of \ce{Lu^+}.
Arnold, K. J. +7 more
core +3 more sources
Mapping the evolution of mitochondrial complex I through structural variation
FEBS Letters, EarlyView.Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin +2 more
wiley +1 more source
Collisionally Induced Atomic Clock Shifts and Correlations
, 2011 We develop a formalism to incorporate exchange symmetry considerations into the calculation of collisional frequency shifts and blackbody radiation effects for atomic clock transitions using a density matrix formalism. The formalism is developed for both
A. Messiah +3 more
core +1 more source
Lattice-induced non-adiabatic frequency shifts in optical lattice clocks
, 2010 We consider the frequency shift in optical lattice clocks which arises from the coupling of the electronic motion to the atomic motion within the lattice.
C. E. Moore, K. Beloy
core +1 more source
Cold atom microwave clock based on intracavity cooling in China space station
npj MicrogravityAtomic clocks with higher frequency stability and accuracy than traditional space-borne atomic clocks are the cornerstone of long-term autonomous operation of space-time-frequency systems.
Siminda Deng +11 more
doaj +1 more source
Optical atomic clock comparison through turbulent air
Physical Review Research, 2020 We use frequency-comb-based optical two-way time-frequency transfer (O-TWTFT) to measure the optical frequency ratio of state-of-the-art ytterbium and strontium optical atomic clocks separated by a 1.5-km open-air link.
Martha I. Bodine +34 more
doaj +1 more source