scholarly journals Recent results of laser spectroscopy experiments of pionic helium atoms at PSI

2021 ◽  
Author(s):  
Masaki HORI ◽  
H. Aghai-Khozani ◽  
Anna Sótér ◽  
Andreas Dax ◽  
Daniel Barna
Keyword(s):  
Resonance Frequency ◽  
Laser Spectroscopy ◽  
Recent Experiment ◽  
Helium Atoms

A review of a recent experiment carried out at PSI involving laser spectroscopy of metastable pionic helium (\pi{^4He}^+\equiv\pi^{-}+{^4He}^{2+}+e^-π4He+≡π−+4He2++e−) atoms is presented. An infrared transition (n,\ell)=(17,16)(n,ℓ)=(17,16)\rightarrow→(17,15)(17,15) at a resonance frequency of \nu\approx 183760ν≈183760 GHz was detected.

scholarly journals Quartz tuning forks resonance frequency matching for laser spectroscopy sensing

2022 ◽  
pp. 100329
Author(s):  
Yufei Ma ◽  
Yinqiu Hu ◽  
Shunda Qiao ◽  
Ziting Lang ◽  
Xiaonan Liu ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Laser Spectroscopy ◽  
Frequency Matching ◽  
Tuning Forks ◽  
Quartz Tuning Forks

scholarly journals Near-infrared laser spectroscopy of antiprotonic helium atoms

2014 ◽  
Vol 66 ◽  
pp. 05010
Author(s):  
T. Kobayashi ◽  
D. Barna ◽  
R. S. Hayano ◽  
Y. Murakami ◽  
K. Todoroki ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Near Infrared ◽  
Infrared Laser ◽  
Antiprotonic Helium ◽  
Helium Atoms ◽  
Infrared Laser Spectroscopy

Laser spectroscopy of antiprotonic helium atoms and ions

2005 ◽  
Vol 83 (4) ◽  
pp. 357-361 ◽  
Author(s):  
R S Hayano
Keyword(s):  
Laser Spectroscopy ◽  
Antiprotonic Helium ◽  
Helium Nucleus ◽  
Low Density ◽  
Body System ◽  
Helium Atoms ◽  
Gas Target ◽  
Helium Gas ◽  
Three Body

Laser spectroscopy of an antiprotonic helium ([Formula: see text]He+) atom, a neutral three-body Coulomb system consisting of an antiproton, a helium nucleus, and an electron has so far contributed to the determination of antiproton mass and charge to a precision of 10-8. Recently, we have succeeded in producing long-lived (τ [Formula: see text] 100 ns) antiprotonic helium ions (two-body system: [Formula: see text]He++). This was done by stopping ∼50 keV antiprotons decelerated by using an "inverse linac" (RFQD) in a very low-density helium gas target and selectively populating the ionic level by using laser tagging. It may be possible to use this two-body ion for future high-precision work.PACS Nos.: 36.10.–k, 34.90.+q, 25.43.+t

scholarly journals Antiproton–to–electron mass ratio determined by two-photon laser spectroscopy of antiprotonic helium atoms

2014 ◽  
Vol 66 ◽  
pp. 05020
Author(s):  
A. Sótér ◽  
M. Hori ◽  
D. Barna ◽  
R. Hayano ◽  
A. Dax ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Antiprotonic Helium ◽  
Electron Mass ◽  
Mass Ratio ◽  
Helium Atoms ◽  
Two Photon

EXOTIC HELIUM ATOMS

2010 ◽  
Vol 19 (12) ◽  
pp. 2586-2593
Author(s):  
R. S. Hayano
Keyword(s):  
Laser Spectroscopy ◽  
Recent Progress ◽  
Historical Background ◽  
Antiprotonic Helium ◽  
Past Study ◽  
Future Prospects ◽  
X Ray ◽  
Helium Atoms

Recent progress on the precision laser spectroscopy of antiprotonic helium atoms, as well as on the x-ray spectroscopy of kaonic helium atoms are presented. These two may appear to be unrelated topics (except for the fact that both being exotic helium atoms), but in fact a past study of kaonic helium system led to the serendipitous discovery of antiprotonic helium. Some historical background connecting these two exotic helium atoms, as well as future prospects are discussed.

scholarly journals Attempt at laser spectroscopy of pionic helium atoms at PSI

2015 ◽  
Author(s):  
Masaki HORI ◽  
Anna Soter ◽  
Hossein Aghai-Khozani ◽  
D. Barna ◽  
Andreas Dax ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Helium Atoms
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