Impact broadening of Rydberg atomic levels in inelastic collisions with alkali-metal atoms

Лебедев, В. С.; Marchenko, V. S.

doi:10.1088/0022-3700/20/22/016

Cited by 27 publications

(19 citation statements)

References 33 publications

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“…Calculations [3][4][5] performed in the impulse approximation have explained the general features of these processes and the large values of the broadening cross sections. However, some attempts [6] to explain the oscillatory dependence of the width on the principal quantum number in the framework of the impulse approximation failed [3].…”

Section: Introductionmentioning

confidence: 99%

Collisional broadening of Rydberg atoms perturbed by ground-state sodium atoms

Borodin

Fabrikant

Kazansky

1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract. Collisional broadening of nS Rydberg states of alkali-metal atoms by sodium atoms is calculated using the adiabatic approach for the 3Z quasimolecular state, and impulse approximation for all other contributions to the collisional width. We obtain oscillatory dependence of the collisional width on the principal quantum number which was observed earlier for heavy alkalies as perturbers. However, the width and the amplitude of the oscillation are much lower than in the case of heavy alkalies. We present a comparison between the results for broadening of heavy alkalies by sodium and for broadening of sodium atoms by heavy alkalies.

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Section: Introductionmentioning

confidence: 99%

Collisional broadening of Rydberg atoms perturbed by ground-state sodium atoms

Borodin

Fabrikant

Kazansky

1993

Z Phys D - Atoms, Molecules and Clusters

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“…An estimate expression [7] based on the dipole approxirnation for the calculation of the atomic form factor yields o'""'+~&10 A for Rb-Rb collisions at n =30, which is four orders of magnitude less than the e-B contribution. Therefore we will include only the e-B contri- Fig.…”

Section: Equations (3) -(5) Should Be Solved For T" ' T" ' T'mentioning

confidence: 98%

“…(6), (7), and (14) we obtain Equations (3) - (5) are very difficult to solve if even we know all properties of the two-body operators t, When the system (1-2) is the Rydberg atom, a reasonable approximation is to put T&2 = 0. This means that we neglect the e -A interaction during the A -B collision, although the momentum distribution of the initial and final states is taken care of by T, 2 and 4f .…”

Section: Equations (3) -(5) Should Be Solved For T" ' T" ' T'mentioning

confidence: 99%

“…In both cases ab initio electron-atom scattering phase shifts were used. Lebedev and Marchenko [7] calculated the quenching cross sections for Rydberg atoms due to the interaction with Na and Rb atoms employing the impulse approximation, but without using the approximate approach of Alekseev and Sobelman. They used semiernpirical scattering phase shifts which were chosen to reproduce experimental data for the quenching cross sections.…”

Section: Introductionmentioning

confidence: 99%

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Impulse-approximation analysis of collisions between Rydberg and ground-state rubidium atoms at thermal energies

Fabrikant

1992

Phys. Rev. A

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The impulse approximation for the Rydberg atom-atom collisions is analyzed on the basis of the Faddeev equations. A modified expression is derived for the cross sections, including the interference between the Rydberg-electronperturber scattering and the ion-coreperturber scattering. This expression is used for the calculations of the collisional quenching and elastic scattering in Rb( nS)-Rb and Rb( nP)-Rb collisions. We use the electron-Rb scattering phase shifts obtained from ab initio close-coupling calculations and their extrapolation, applying the modified effective-range theory. Our results show that the impulse approximation agrees with the experimental data for the quenching cross sections at n )20 but underestimates the quenching cross sections at lower n. The position of the maximum of the cross section is in good agreement with experimental data. We also obtain reasonable results for the elastic cross section at n )20, but for the lower n the results are too large. The interference effect plays a minor role in the process, which means that simultaneous electron-perturber and ion-perturber interaction is unlikely.PACS number(s): 34.60.+ z, 32.70.Jz

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“…In the special case of isotropic collisions and relaxation within a single Zeeman multiplet I~J} the relaxation matrix in the irreducible representation is diagonal, i.e., dp~/d t = -gk P~, (8) where gk are the collisional relaxation rates of the different multipoles of the Zeeman multiplet. They are real and positive except go =0 and may be expressed as …”

Section: (7)mentioning

confidence: 99%

Theoretical approach for collisional depolarization of Rydberg atoms

Hermann

Kaulakys

Udem

1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract.A theoretical analysis of the collisional depolarization of Rydberg atoms is presented. Using the general formalism of irreducible tensors for collisional depolarization and an approximate expression of the collision matrix for the Rydberg-perturber scattering, simple analytical expressions for the depolarization cross sections of different multipoles are obtained. It is shown that depolarization cross sections may be expressed in terms of the universal cross section for the collisional broadening of Rydberg states. Explicit expressions for cross sections of the one-electron nP3/2 and np states are presented.

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Impact broadening of Rydberg atomic levels in inelastic collisions with alkali-metal atoms

Cited by 27 publications

References 33 publications

Collisional broadening of Rydberg atoms perturbed by ground-state sodium atoms

Collisional broadening of Rydberg atoms perturbed by ground-state sodium atoms

Impulse-approximation analysis of collisions between Rydberg and ground-state rubidium atoms at thermal energies

Theoretical approach for collisional depolarization of Rydberg atoms

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