VUV spectroscopy of magnetically trapped atomic hydrogen

Luiten, O.J.; Werij, H. G. C.; Reynolds, M.W.; Setija, I.D.; Hijmans, T.W.; Walraven, J.T.M.

doi:10.1007/bf01081399

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…The cross section for Lyman-α light being resonantly absorbed by H can be as high as 3λ 2 α /2π [354]. This implies that the excitation rate for H illuminated with a 1 nW Lyman-α laser beam with diameter of 1 mm is 5 s −1 .…”

Section: Laser Cooling Of Trapped Antihydrogenmentioning

confidence: 99%

Physics at CERN’s Antiproton Decelerator

Hori

Walz

2013

Progress in Particle and Nuclear Physics

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The Antiproton Decelerator (AD) facility of CERN began operation in 1999 to serve experiments for studies of CP T invariance by precision laser and microwave spectroscopy of antihydrogen (H) and antiprotonic helium (pHe + ) atoms. The first 12 years of AD operation saw cold H synthesized by overlapping clouds of positrons (e + ) and antiprotons (p) confined in magnetic Penning traps. Cold H was also produced in collisions between Rydberg positronium (P s) atoms and p. Ground-state H was later trapped for up to ∼ 1000 s in a magnetic bottle trap, and microwave transitions excited between its hyperfine levels. In the pHe + atom, deep ultraviolet transitions were measured to a fractional precision of (2.3-5) × 10 −9 by sub-Doppler two-photon laser spectroscopy. From this the antiproton-to-electron mass ratio was determined as M p /m e =1836.1526736(23), which agrees with the p value known to a similar precision. Microwave spectroscopy of pHe + yielded a measurement of the p magnetic moment with a precision of 0.3%. More recently, the magnetic moment of a single p confined in a Penning trap was measured with a higher precision, as µ p = −2.792845(12)µ nucl in nuclear magnetons. Other results reviewed here include the first measurements of the energy loss (−dE/dx) of 1-100 keV p traversing conductor and insulator targets; the cross sections of low-energy (< 10 keV) p ionizing atomic and molecular gas targets; and the cross sections of 5-MeV p annihilating on various target foils via nuclear collisions. The biological effectiveness of p beams destroying cancer cells was measured as a possible method for radiological therapy. New experiments under preparation attempt to measure the gravitational acceleration of H or synthesize H + . Several other future experiments will also be briefly described.

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Section: Laser Cooling Of Trapped Antihydrogenmentioning

confidence: 99%

Physics at CERN’s Antiproton Decelerator

Hori

Walz

2013

Progress in Particle and Nuclear Physics

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“…The resonant absorption cross-section for radiation at Lyman-α can be as high as 3λ 2 α /2π [41]. Consider a volume of 1 mm diameter being illuminated with 1 nW resonant radiation at Lyman-α.…”

Section: Laser Cooling and Shelving Spectroscopymentioning

confidence: 99%

Towards laser spectroscopy of antihydrogen

Walz

Fendel

Herrmann

et al. 2003

J. Phys. B: At. Mol. Opt. Phys.

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Cold antihydrogen atoms in a magnetic trap will open up a fascinating field of very precise CPT tests by ultrahigh-resolution laser spectroscopy. Equally exciting is the prospect for experiments on the gravitational acceleration of antimatter. For both types of experiment it is of great importance to have antihydrogen as cold as possible. Laser cooling of antihydrogen can be done on the strong 1S-2P transition at Lyman-α (121.56 nm). The highest cooling efficiency, lowest temperature, and best magnetic sublevel selectivity is expected for continuous coherent radiation. We present an account of the first source for continuous coherent radiation at Lyman-α and discuss possible applications in experiments with antihydrogen.

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“…We produce this VUV radiation at 121.6 nm wavelength by frequency tripling of a pulsed UV laser source [11]. The VUV light traverses the cell and buffer on the axis of the system.…”

Section: Optical Excitation Of Atomic Hydrogen Bound To the Surface Omentioning

confidence: 99%