Collision theory of Rydberg atoms with neutral and charged particles

Бейгман, И. Л.; Лебедев, В. С.

doi:10.1016/0370-1573(95)00074-q

Cited by 115 publications

(129 citation statements)

References 258 publications

Supporting

Mentioning

126

Contrasting

Unclassified

Order By: Relevance

“…Associative ionization reactions creating Rb þ 2 were examined in the existing literature [28][29][30][31][32], leading to the ionization of the Rydberg electron as a consequence of the short-range interaction between the ionic core and the incoming neutral atom [33]. Inelastic collisions of highly excited Rydberg atoms in a dense background gas at room temperature were observed in the late 1970s [34][35][36] and early 1980s [37], and simultaneously, the theoretical framework associated with such a process was developed by adopting a semiclassical description of the dynamics, in combination with a constant Rydberg electron-neutral atom scattering length [38][39][40] in applications of the Fermi pseudopotential.…”

Section: Introductionmentioning

confidence: 99%

Ultracold Chemical Reactions of a Single Rydberg Atom in a Dense Gas

et al. 2016

View full text Add to dashboard Cite

Within a dense environment (ρ ≈ 10 14 atoms=cm 3 ) at ultracold temperatures (T < 1 μK), a single atom excited to a Rydberg state acts as a reaction center for surrounding neutral atoms. At these temperatures, almost all neutral atoms within the Rydberg orbit are bound to the Rydberg core and interact with the Rydberg atom. We have studied the reaction rate and products for nS 87 Rb Rydberg states, and we mainly observe a state change of the Rydberg electron to a high orbital angular momentum l, with the released energy being converted into kinetic energy of the Rydberg atom. Unexpectedly, the measurements show a threshold behavior at n ≈ 100 for the inelastic collision time leading to increased lifetimes of the Rydberg state independent of the densities investigated. Even at very high densities (ρ ≈ 4.8 × 10 14 cm −3 ), the lifetime of a Rydberg atom exceeds 10 μs at n > 140 compared to 1 μs at n ¼ 90. In addition, a second observed reaction mechanism, namely, Rb þ 2 molecule formation, was studied. Both reaction products are equally probable for n ¼ 40, but the fraction of Rb þ 2 created drops to below 10% for n ≥ 90.

show abstract

Section: Introductionmentioning

confidence: 99%

Ultracold Chemical Reactions of a Single Rydberg Atom in a Dense Gas

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Interactions of neutral atoms in their ground states with atoms in highly excited Rydberg states attracted considerable scientific attention ( [1,2] and references therein) since Fermi's development of the theory explaining pressure shifts of atomic Rydberg spectral lines [3].…”

Section: Introductionmentioning

confidence: 99%

Adiabatic potential-energy curves of long-range Rydberg molecules: Two-electronR-matrix approach

Tarana

Čurík

2016

Phys. Rev. A

View full text Add to dashboard Cite

We introduce a computational method developed for study of long-range molecular Rydberg states of such systems that can be approximated by two electrons in a model potential of the atomic cores. Only diatomic molecules are considered. The method is based on a two-electron Rmatrix approach inside a sphere centered on one of the atoms. The wave function is then connected to a Coulomb region outside the sphere via multichannel version of the Coulomb Green's function.This approach is put into a test by its application to a study of Rydberg states of the hydrogen molecule for internuclear distances R from 20 to 400 bohrs and energies corresponding to n from 3 to 22. The results are compared with previous quantum chemical calculations (lower quantum numbers n) and computations based on contact potential models (higher quantum numbers n).

show abstract

“…In recent years there has been considerable progress in the theory of collisional processes [5 -7] between Rydberg atoms and neutral perturbers. The collision theory of Rydberg atoms with neutral and charged particles has been presented by Beigman and Lebedev [5].Also, the theory of ionization of highly excited atoms by neutral particles (atoms or molecules), as well as the theory of direct and associative ionization of Rydberg atoms in thermal collisions with neutral atomic particles, has been developed within the framework of the quasifree electron model by Lebedev [6,7]. In these studies analytical expressions for ionization cross sections and rate constants were derived, and numerical calculations for Rydberg hydrogen and xenon atoms in collisions with He, Kr, and Xe were carried out.…”

Section: Introductionmentioning

confidence: 99%

Absolute cross-section measurements for ionization of He Rydberg atoms in collisions with K

et al. 1995

View full text Add to dashboard Cite

Absolute cross sections for ionization of 1.5 -10.0 keV/amu Rydberg helium atoms in principal quantum states 12~n~15 due to collisions with potassium have been measured. The data are compared with the free-electron cross section at equal velocity. Our results for the collisional ionization cross sections (o;) agree both in shape and absolute magnitude with the data available for the total electron-scattering cross sections (o. ,) and support recent theoretical models for ionization of Rydberg atoms with neutral perturbers. PACS number(s): 34.50.s, 34.80.i, 34.60.+z

show abstract

Collision theory of Rydberg atoms with neutral and charged particles

Cited by 115 publications

References 258 publications

Ultracold Chemical Reactions of a Single Rydberg Atom in a Dense Gas

Ultracold Chemical Reactions of a Single Rydberg Atom in a Dense Gas

Adiabatic potential-energy curves of long-range Rydberg molecules: Two-electronR-matrix approach

Absolute cross-section measurements for ionization of He Rydberg atoms in collisions with K

Contact Info

Product

Resources

About