共查询到20条相似文献,搜索用时 15 毫秒
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H.-D. Betz J. Rothermel D. Röschenthaler F. Bell R. Schuch G. Nolte 《Physics letters. A》1982,91(1):12-14
The population of Rydberg states in fast oxygen ions emerging from solid targets is found to be more than ≈ 500 times as large as expected from Coulomb capture of target electrons in last-layer collisions. Furthermore, we find a population depletion for quantum states near n ≈ 10. 相似文献
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We have observed by quantum beat spectroscopy the Stark effect in a low electric field of highly excited Na nD states (n = 10, 11, 12). The polarizabilities are found to be 106 to 107 time larger than those of atoms in ground or low lying excited states and are in good agreement with theoretical values calculated from a hydrogenic model. 相似文献
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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. 相似文献
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New uv absorption spectra have been observed for SiBr. Five Rydberg states are identified to the states , , , , and by comparison with SiF and SiCl. The ionization potentials of SiCl and SiBr have been determined for the first time, and were 6.82 and 6.67 eV, respectively. 相似文献
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F. Dahia E. Maciel A. S. Lemos 《The European Physical Journal C - Particles and Fields》2018,78(6):526
Precise measurements of optical transition frequencies between Rydberg states of hydrogen-like ions could be used to obtain an improved value of the Rydberg constant, by avoiding the uncertainties about the proton radius. Motivated by this perspective, we investigate the influence of the gravitational interaction on the energy levels of Hydrogen-like ions in Rydberg states in a braneworld model. As it is known, in this scenario, the gravitational interaction is amplified in short distances. We show that, for Rydberg states, the main contribution for the gravitational potential energy does not come from the rest energy concentrated on the nucleus but from the energy of the electromagnetic field created by its electric charge. The reason is connected to the fact that, when the ion is in a Rydberg state with high angular momentum, the gravitational potential is not computable in zero-width brane approximation due to the gravitational influence of the electrovacuum in which the lepton is moving. Considering a thick brane scenario, we calculate the gravitational potential energy associated to the nucleus charge in terms of the confinement parameter of the electric field in the brane. We show that the gravitational effects on the energy levels of a Rydberg state can be amplified by hidden dimensions even when the compactification scale is shorter than the Bohr radius. 相似文献
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Dutta SK Feldbaum D Walz-Flannigan A Guest JR Raithel G 《Physical review letters》2001,86(18):3993-3996
Cold, dense Rydberg gases produced in a cold-atom trap are investigated using spectroscopic methods and time-resolved electron counting. Optical excitation on the discrete Rydberg resonances reveals long-lasting electron emission from the Rydberg gas ( >20 ms). Our observations are explained by lm-mixing collisions between Rydberg atoms and slow electrons that lead to the population of long-lived high-angular-momentum Rydberg states. These atoms thermally ionize slowly and with large probabilities. 相似文献
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The complementary threshold ionization techniques of MATI and ZEKE spectroscopy have been used to reveal well-resolved, long-lived (>10 micros) hydrogenic Rydberg series (50< or =n< or =98) in a van der Waals complex formed between a polyatomic molecule and a diatomic molecule for the first time. The series are observed within 50 cm(-1) of the adiabatic ionization threshold as well as two core-excited thresholds corresponding to excitation of up to two quanta in the van der Waals vibrational mode. 相似文献