Dynamics of electronic excitation in collisions of alkali atoms with noble-gas atoms using atomic core potentials

2003 ◽  
Vol 119 (23) ◽  
pp. 12308-12315 ◽  
Author(s):  
A. Reyes ◽  
D. A. Micha
Keyword(s):  
Electronic Excitation ◽  
Noble Gas ◽  
Atomic Core ◽  
Alkali Atoms

Theory of excitation transfer in collisions between alkali atoms. I. Identical partners

1969 ◽  
Vol 47 (12) ◽  
pp. 1237-1248 ◽  
Author(s):  
E. I. Dashevskaya ◽  
A. I. Voronin ◽  
E. E. Nikitin
Keyword(s):  
Excitation Energy ◽  
Excited States ◽  
Cross Section ◽  
Electronic Excitation ◽  
Electronic States ◽  
Excitation Transfer ◽  
Electronic Excitation Energy ◽  
Alkali Atoms ◽  
The Cross

A mechanism is derived for nonresonant transfer of electronic excitation energy, induced in the process M*(2P3/2) + M(2S1/2) → M*(2P1/2) + M(2S1/2), where M and M* are identical alkali atoms in the ground and first excited states, respectively. Various types of interactions, responsible for the nonadiabatic combination of electronic states of the quasi molecule M2*, were considered, and their respective contributions to the cross section for excitation transfer were determined.

scholarly journals NOBLE GAS, ALKALI AND ALKALINE ATOMS INTERACTING WITH A GOLD SURFACE

2010 ◽  
Vol 25 (11) ◽  
pp. 2337-2344 ◽  
Author(s):  
GRZEGORZ ŁACH ◽  
MAARTEN DEKIEVIET ◽  
ULRICH D. JENTSCHURA
Keyword(s):  
Noble Gas ◽  
Gold Surface ◽  
Perfect Conductor ◽  
Interaction Potentials ◽  
Atomic Systems ◽  
Electromagnetic Interactions ◽  
Alkali Atoms ◽  
Explicitly Correlated ◽  
Realistic Representation ◽  
Dynamic Polarizabilities

The attractive branch of the interaction potentials with the surface of gold have been computed for a large variety of atomic systems: the hydrogen atom, noble gases ( He , Ne , Ar , Kr , Xe ), alkali atoms ( Li , Na , K , Rb , Cs ) and alkaline atoms ( Be , Mg , Ca , Sr , Ba ). The results include highly accurate dynamic polarizabilities for the helium atom calculated using a variational method and explicitly correlated wavefunctions. For other atoms considered we used the data available in the literature. The interaction potentials include both the effects of retardation of the electromagnetic interactions and a realistic representation of the optical response function of gold (beyond the approximation of a perfect conductor). An explicit comparison of our result to the interaction between an atom and a perfect conductor is given.

Sensitized Fluorescence in Vapors of Alkali Atoms XIV. Temperature Dependence of Cross Sections for 72P1/2–72P3/2 Mixing in Cesium, Induced in Collisions with Noble Gas Atoms

1974 ◽  
Vol 52 (11) ◽  
pp. 945-949 ◽  
Author(s):  
I. N. Siara ◽  
H. S. Kwong ◽  
L. Krause
Keyword(s):  
Temperature Dependence ◽  
Cross Sections ◽  
Noble Gas ◽  
Excitation Transfer ◽  
Sensitized Fluorescence ◽  
Alkali Atoms ◽  
Resonance Doublet ◽  
The Cross ◽  
Adiabatic Case

The cross sections for 72P1/2–72P3/2 excitation transfer in cesium, induced in collisions with noble gas atoms, have been determined in a series of sensitized fluorescence experiments at temperatures ranging from 405 to 630 K. The cross sections which lie in the range 0.06–20 Å2, exhibit a temperature dependence which, however, is less pronounced than in the more adiabatic case of the cesium resonance doublet.

Sensitized Fluorescence in Vapors of Alkali Atoms. XIII. 62P1/2−62P3/2 Excitation Transfer in Rubidium, Induced in Collisions with Noble Gas Atoms

1972 ◽  
Vol 50 (16) ◽  
pp. 1826-1832 ◽  
Author(s):  
I. Siara ◽  
E. S. Hrycyshyn ◽  
L. Krause
Keyword(s):  
Fine Structure ◽  
Cross Sections ◽  
Noble Gas ◽  
Excitation Transfer ◽  
Fluorescent Intensity ◽  
Rubidium Vapor ◽  
Sensitized Fluorescence ◽  
Fine Structure Splitting ◽  
Alkali Atoms ◽  
Structure Splitting

The cross sections for excitation transfer between the 62P fine-structure substates in rubidium, induced in collisions with noble gas atoms, have been determined in a series of sensitized fluorescence experiments. Mixtures of rubidium vapor and noble gases at pressures varying in the range 0–5 Torr were irradiated with each component of the second 2P rubidium doublet in turn and the following cross sections for 2P mixing were obtained from measurements of sensitised-to-resonance fluorescent intensity ratios. Rb–He: Q12(2P1/2 → 2P3/2) = 29.3 Å2; Q21(2P1/2 ← 2P3/2) = 19.0 Å2. Rb–Ne: Q12 = 10.3 Å2; Q21 = 6.4 Å2. Rb–Ar: Q12 = 24.0 Å2; Q21 = 14.9 Å2. Rb–Kr: Q12 = 23.2 Å2; Q21 = 14.6 Å2. Rb–Xe: Q12 = 43.9 Å2; Q21 = 27.7 Å2 In their dependence on the magnitude of the fine-structure splitting, the values are consistent with previously determined cross sections for mixing in the first and third 2P doublets of alkali atoms.

Theory of excitation transfer in collisions between alkali atoms. II. Dissimilar partners

1970 ◽  
Vol 48 (8) ◽  
pp. 981-992 ◽  
Author(s):  
E. I. Dashevskaya ◽  
E. E. Nikitin ◽  
A. I. Voronin ◽  
A. A. Zembekov
Keyword(s):  
Excitation Energy ◽  
Exchange Interaction ◽  
Cross Sections ◽  
Electronic Excitation ◽  
Dipole Interaction ◽  
Electronic Energy ◽  
Alkali Atom ◽  
Electronic Excitation Energy ◽  
Alkali Atoms ◽  
Experimental Values

Possible mechanisms are considered for the transfer of electronic excitation energy in collisions between an excited alkali atom MA*(2Pj) and an unexcited atom MB(2S1/2). It is shown that a dipole–dipole interaction which is responsible for the transfer of electronic excitation energy in collisions between identical partners (MA = MB) is not sufficient to explain the observed magnitudes of the cross sections and that, therefore, the exchange interaction can no longer be neglected. If the exchange interaction is taken into account, it can be shown that there are regions of nonadiabaticity in the energy diagram, which are probably responsible for the change in the electronic energy states of the collision partners. The calculated cross sections are compared with experimental values.

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