scholarly journals Precision spectroscopy on the 2 3S-2 3P transition of atomic helium

2018 ◽  
Vol 67 (16) ◽  
pp. 164203
Author(s):  
Zheng Xin ◽  
Sun Yu ◽  
Chen Jiao-Jiao ◽  
Hu Shui-Ming
Keyword(s):  
Precision Spectroscopy ◽  
Atomic Helium

scholarly journals Precision spectroscopy of atomic helium

2020 ◽  
Vol 7 (12) ◽  
pp. 1818-1827
Author(s):  
Yu R Sun ◽  
Shui-Ming Hu
Keyword(s):  
Fine Structure ◽  
Quantum Electrodynamics ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Nuclear Charge Radius ◽  
Precision Spectroscopy ◽  
Structure Splitting ◽  
Three Body ◽  
Atomic Helium

Abstract Helium is a prototype three-body system and has long been a model system for developing quantum mechanics theory and computational methods. The fine-structure splitting in the 23P state of helium is considered to be the most suitable for determining the fine-structure constant α in atoms. After more than 50 years of efforts by many theorists and experimentalists, we are now working toward a determination of α with an accuracy of a few parts per billion, which can be compared to the results obtained by entirely different methods to verify the self-consistency of quantum electrodynamics. Moreover, the precision spectroscopy of helium allows determination of the nuclear charge radius, and it is expected to help resolve the ‘proton radius puzzle’. In this review, we introduce the latest developments in the precision spectroscopy of the helium atom, especially the discrepancies among theoretical and experimental results, and give an outlook on future progress.

THE EFFECT OF COLLISIONS IN PRECISION SPECTROSCOPY

1981 ◽  
Vol 42 (C8) ◽  
pp. C8-29-C8-35
Author(s):  
V. A. Alekseev
Keyword(s):  
Precision Spectroscopy

scholarly journals 422 Million intrinsic quality factor planar integrated all-waveguide resonator with sub-MHz linewidth

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Matthew W. Puckett ◽  
Kaikai Liu ◽  
Nitesh Chauhan ◽  
Qiancheng Zhao ◽  
Naijun Jin ◽  
...  
Keyword(s):  
Quality Factor ◽  
High Capacity ◽  
Precision Spectroscopy ◽  
Narrow Linewidth ◽  
Waveguide Resonator ◽  
Environmental Disturbances ◽  
Fiber Communications ◽  
Intrinsic Quality ◽  
Quality Factor Q ◽  
Quantum Photonics

AbstractHigh quality-factor (Q) optical resonators are a key component for ultra-narrow linewidth lasers, frequency stabilization, precision spectroscopy and quantum applications. Integration in a photonic waveguide platform is key to reducing cost, size, power and sensitivity to environmental disturbances. However, to date, the Q of all-waveguide resonators has been relegated to below 260 Million. Here, we report a Si3N4 resonator with 422 Million intrinsic and 3.4 Billion absorption-limited Qs. The resonator has 453 kHz intrinsic, 906 kHz loaded, and 57 kHz absorption-limited linewidths and the corresponding 0.060 dB m−1 loss is the lowest reported to date for waveguides with deposited oxide upper cladding. These results are achieved through a careful reduction of scattering and absorption losses that we simulate, quantify and correlate to measurements. This advancement in waveguide resonator technology paves the way to all-waveguide Billion Q cavities for applications including nonlinear optics, atomic clocks, quantum photonics and high-capacity fiber communications.

scholarly journals Precision spectroscopy of the molecular ion HD+: Control of Zeeman shifts

2010 ◽  
Vol 82 (5) ◽  
Author(s):  
Dimitar Bakalov ◽  
Vladimir Korobov ◽  
Stephan Schiller
Keyword(s):  
Precision Spectroscopy ◽  
Molecular Ion

scholarly journals Semiclassical description of antiproton capture on atomic helium

1993 ◽  
Vol 48 (4) ◽  
pp. 2779-2785 ◽  
Author(s):  
W. A. Beck ◽  
L. Wilets ◽  
M. A. Alberg
Keyword(s):  
Atomic Helium
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