First Direct Observation of Coulomb Explosion during the Formation of Exotic Atoms

Siems, Th.; Anagnostopoulos, D. F.; Borchert, G.; Gotta, D.; Hauser, Peter C.; Kirch, K.; Simons, L. M.; El‐Khoury, Patrick Z.; Indelicato, P.; Augsburger, Marc; Chatellard, D.; Egger, J.‐P.

doi:10.1103/physrevlett.84.4573

Cited by 27 publications

(18 citation statements)

References 20 publications

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“…For gaseous targets, pionic oxygen can be regarded as a hydrogen-like atomic system, because screening effects from remaining electrons are small due to a practically complete removal of the electron shells before the πO(6h − 5g) transition occurs [50,51,52]. Line broadening owing to Coulomb explosion [53] is symmetric and, hence, does not affect the position. Similarly, Doppler broadening caused by Coulomb de-excitation [54,55] can be assumed to be symmetric as well (see, e. g., ref.…”

Section: Energy Calibrationmentioning

confidence: 99%

Hadronic shift in pionic hydrogen

et al. 2014

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Abstract. The hadronic shift in pionic hydrogen has been redetermined to be 1s = 7.086 ± 0.007(stat) ± 0.006(sys) eV by X-ray spectroscopy of ground state transitions applying various energy calibration schemes. The experiment was performed at the high-intensity low-energy pion beam of the Paul Scherrer Institut by using the cyclotron trap and an ultimate-resolution Bragg spectrometer with bent crystals.

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Section: Energy Calibrationmentioning

confidence: 99%

Hadronic shift in pionic hydrogen

et al. 2014

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“…7). It turned out that the line width is dominated by the Doppler broadening [38]. The line broadening yields the product of the ions' charge state and was found to be consistent with the number of the binding electrons.…”

Section: Coulomb Explosionmentioning

confidence: 90%

Light pionic atoms – perspectives for precision experiments

2009

EXA05 International Conference on Exotic Atoms and Related Topics

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During the last decades high-precision spectroscopy of exotic-atom X-rays profited in particular in the case of pions from the increasing number of stopped particles provided by the cyclotron trap at the accelerator facility of the Paul-Scherrer-Institut (PSI) together with modern detector concepts like charge-coupled devices (CCDs) and crystal spectrometers. Presently, priority is given to the study of the strong-interaction effects in the most elementary system-pionic hydrogen. However, the systems with two or more nucleons are as fundamental for the development of a theoretical description of hadronic matter. Furthermore, the de-excitation of exotic atoms involves a variety of atomic processes, which become accessible in detail due to the high resolution achievable with crystal spectrometers, e. g., parallel transitions, line splittings, broadenings and intensity distributions. In addition, first successful attempts for a microscopic description of the atomic cascade are available now, which should be subject to stringent tests both for atoms and molecules.

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“…A direct observation of the Doppler broadening of X-rays was first achieved for pionic and muonic atoms in the (5-4) transitions of nitrogen and oxygen [29]. The Doppler width yields the velocity of the ion at the time of X-ray emission, which allows an estimate for the charge state at the time of separation.…”

Section: Coulomb Explosionmentioning

confidence: 94%