The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Wim Ubachs - One of the best experts on this subject based on the ideXlab platform.
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Observation of a Rydberg series in H+H-: a heavy Bohr Atom.
Physical review letters, 2008Co-Authors: M.o. Vieitez, C.a. De Lange, T.i. Ivanov, E.m. Reinhold, Wim UbachsAbstract:We report on the realization of a heavy "Bohr Atom," through the spectroscopic observation of a Rydberg series of bound quantum states at principal quantum numbers n=140 to 230. The system is made heavy by replacing an electron inside a hydrogen Atom by a composite H- particle, thus forming a H+H- Coulombically bound system obeying the physical laws of a generalized Atom with appropriate mass scaling.
Helge Kragh - One of the best experts on this subject based on the ideXlab platform.
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the many faces of the Bohr Atom
arXiv: History and Philosophy of Physics, 2013Co-Authors: Helge KraghAbstract:The Atomic model that Niels Bohr suggested in 1913 celebrated its greatest victories in connection with one-electron Atoms. Among them were the isotopic spectral effect and what became known as Rydberg Atoms, insights that were fully recognized only many years later. He considered the original ring model a first step towards an understanding of Atomic structure, and during the following years he developed it into more ambitious models that, he hoped, would also describe many-electron Atoms. His theory of the periodic system marked the culmination of the orbital Atom within the framework of the old quantum theory. However, the theory would soon be replaced by more symbolic models that heralded the coming of the quantum-mechanical Atom.
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spreading the gospel a popular book on the Bohr Atom in its historical context
Annals of Science, 2013Co-Authors: Helge Kragh, Kristian Hvidtfelt NielsenAbstract:Summary The emergence of quantum theory in the early decades of the twentieth century was accompanied by a wide range of popular science books, all of which presented in words, and a few in images, new scientific ideas about the structure of the Atom. The work of physicists such as Ernest Rutherford and Niels Bohr, among others, was pivotal to the so-called planetary model of the Atom, which, still today, is used in popular accounts and in science textbooks. In an attempt to add to our knowledge about the popular trajectory of the new Atomic physics, this paper examines one book in particular, co-authored by Danish science writer Helge Holst and Dutch physicist and close collaborator of Niels Bohr, Hendrik A. Kramers. Translated from Danish into four European languages, the book not only explained contemporary ideas about the quantum Atom, but also discussed unresolved problems. Moreover, the book was quite explicit in identifying the quantum Atom with the Atom as described by Bohr's theory. We argue that...
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niels Bohr and the quantum Atom the Bohr model of Atomic structure 1913 1925
2012Co-Authors: Helge KraghAbstract:1. Atomic theory before 1913 2. On the constitution of Atoms and molecules 3. Reception and early developments 4. The Bohr-Sommerfeld theory 5. A magic wand 6. Molecules and other failures 7. A theory of the chemical elements 8. The end of the Bohr Atom 9. Appendix: The philosophers' Atom
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spreading the gospel the Bohr Atom popularised
arXiv: History and Philosophy of Physics, 2011Co-Authors: Helge Kragh, Kristian Hvidtfelt NielsenAbstract:The emergence of quantum theory in the early decades of the twentieth century was accompanied by a wide range of popular science books, all of which presented in words and in images new scientific ideas about the structure of the Atom. The work of physicists such as Ernest Rutherford and Niels Bohr, among others, was pivotal to the so-called planetary model of the Atom, which, still today, is used in popular accounts and in science textbooks. In an attempt to add to our knowledge about the popular trajectory of the new Atomic physics, this paper examines one book in particular, coauthored by Danish science writer Helge Holst and Dutch physicist and close collaborator of Niels Bohr, Hendrik A. Kramers. Translated from Danish into four European languages, the book not only presented contemporary ideas about the quantum Atom, but also went into rather lengthy discussions about unresolved problems. Moreover, the book was quite explicit in identifying the quantum Atom with the Atom as described by Bohr's theory. We argue that Kramers and Holst's book, along with other Atomic books, was a useful tool for physicists and science popularisers as they grappled with the new quantum physics.
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Resisting the Bohr Atom: The Early British Opposition
Physics in Perspective, 2011Co-Authors: Helge KraghAbstract:When Niels Bohr’s theory of Atomic structure appeared in the summer and fall of 1913, it quickly attracted attention among British physicists. While some of the attention was supportive, others was critical. I consider the opposition to Bohr’s theory from 1913 to about 1915, including attempts to construct Atomic theories on a classical basis as alternatives to Bohr’s. I give particular attention to the astrophysicist John W. Nicholson, who was Bohr’s most formidable and persistent opponent in the early years. Although in the long run Nicholson’s objections were inconsequential, for a short period of time his Atomic theory was considered to be a serious rival to Bohr’s. Moreover, Nicholson’s theory is of interest in its own right.
M.o. Vieitez - One of the best experts on this subject based on the ideXlab platform.
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Observation of a Rydberg series in H+H-: a heavy Bohr Atom.
Physical review letters, 2008Co-Authors: M.o. Vieitez, C.a. De Lange, T.i. Ivanov, E.m. Reinhold, Wim UbachsAbstract:We report on the realization of a heavy "Bohr Atom," through the spectroscopic observation of a Rydberg series of bound quantum states at principal quantum numbers n=140 to 230. The system is made heavy by replacing an electron inside a hydrogen Atom by a composite H- particle, thus forming a H+H- Coulombically bound system obeying the physical laws of a generalized Atom with appropriate mass scaling.
C.a. De Lange - One of the best experts on this subject based on the ideXlab platform.
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Observation of a Rydberg series in H+H-: a heavy Bohr Atom.
Physical review letters, 2008Co-Authors: M.o. Vieitez, C.a. De Lange, T.i. Ivanov, E.m. Reinhold, Wim UbachsAbstract:We report on the realization of a heavy "Bohr Atom," through the spectroscopic observation of a Rydberg series of bound quantum states at principal quantum numbers n=140 to 230. The system is made heavy by replacing an electron inside a hydrogen Atom by a composite H- particle, thus forming a H+H- Coulombically bound system obeying the physical laws of a generalized Atom with appropriate mass scaling.
T.i. Ivanov - One of the best experts on this subject based on the ideXlab platform.
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Observation of a Rydberg series in H+H-: a heavy Bohr Atom.
Physical review letters, 2008Co-Authors: M.o. Vieitez, C.a. De Lange, T.i. Ivanov, E.m. Reinhold, Wim UbachsAbstract:We report on the realization of a heavy "Bohr Atom," through the spectroscopic observation of a Rydberg series of bound quantum states at principal quantum numbers n=140 to 230. The system is made heavy by replacing an electron inside a hydrogen Atom by a composite H- particle, thus forming a H+H- Coulombically bound system obeying the physical laws of a generalized Atom with appropriate mass scaling.