Collective effects on ionization of Rydberg sodium atoms by blackbody radiation

Fuso, Francesco; Allegrini, M.; Dygdala, Roman S.; Giammanco, F.; Arimondo, E.

doi:10.1016/0030-4018(91)90417-c

Cited by 3 publications

(9 citation statements)

References 15 publications

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“…2 as a function of the photoelectron energy. The last two cross-sections o-C cr~ = o-~ appearing in the equations have been obtained by using the experimental results of [7][8][9] on laser ionization of sodium atoms in our equations. More precisely, we have derived those cross sections from the best self-consistent agreement for the dependence of the produced N~ ion density on the total sodium atomic density and on the ~b 2 laser flux.…”

Section: Sodium Cross-sectionsmentioning

confidence: 99%

“…For sodium atoms, to which our model is here applied, the following identifications hold: ground state is 32Sl/a, excited state is 32p3/2, Rydberg state is 182D5/2 or 20 2D5/2 corresponding to experiments of [7][8] and [9] respectively. Atomic parameters relevant for the solution of the above equations in the case of sodium are reported in Table 1 for the states of interest; the cross-sections axi(i= 1, 2) and spontaneous emission rates of the various transitions have been obtained from [11 ].…”

Section: Sodium Cross-sectionsmentioning

confidence: 99%

“…Furthermore, in order to describe the results of different experiments [7][8][9], the electrons are divided into two classes, each arising from a different ionization process: slow electrons, i.e. with small kinetic energy (~0.01 eV), produced by blackbody photons or ionizing collisions, and fast electrons, i.e.…”

Section: The "Bath" Modelmentioning

confidence: 99%

“…In the application of the model to sodium atoms, use will be made of experimental results reported in previous investigations [7][8][9]; thus the experimental arrangement will not be reported here.…”

Section: Introductionmentioning

confidence: 98%

“…Sodium vapors have been thoroughly investigated so that many parameters associated with atomic properties, reaction and ionization channels have been determined. The measured [7][8][9] ionization rate dependences on sodium density and laser intensity allow us to test our model by deriving good values of Rydberg ionization cross-sections by collisions with other Rydberg states and by electron collisions. The derived cross sections are consistent with previous determinations, where available.…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Model for atomic multiphoton ionization via Rydberg states

Fuso

Allegrini

Arimondo

et al. 1992

Z Phys D - Atoms, Molecules and Clusters

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Abstract.A model to treat multiphoton ionization through Rydberg states, taking into account blackbody radiation and other processes which lead to ionization with transfer of excitation among the closely-spaced highly excited Rydberg states is presented. The basic idea is to make the rate equations tractable by compacting all of the Rydberg states that experience physically similar processes into a single "bath" in the equations. The model is applied to sodium Rydberg atoms and the predictions show excellent agreement with experiments.

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Section: Sodium Cross-sectionsmentioning

confidence: 99%

Section: Sodium Cross-sectionsmentioning

confidence: 99%

Section: The "Bath" Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Model for atomic multiphoton ionization via Rydberg states

Fuso

Allegrini

Arimondo

et al. 1992

Z Phys D - Atoms, Molecules and Clusters

Self Cite

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Mutual electron-ion interactions in electron impact ionization of a Ca beam

et al. 1996

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We evaluate the role of electron-ion mutual interactions as a possible source of systematic errors in an experiment of electron impact ionization and excitation of an effusive Ca beam. By monitoring photons resulting from the impact excitation of a Ca resonant transition, the transmitted electron beam current by a sectored Faraday cup and total ion yields, we extract information about elementary processes responsible for ionization. We show that our diagnosis allows us to monitor the influence of the produced ionization on the elementary processes and on the density profile of the electron beam

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Modular digital box-car for applications in pulsed laser spectroscopy

Dygdal¹,

Fuso

Arimondo

et al. 1995

Review of Scientific Instruments

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A digital box-car, designed to work with sources producing signals composed of single pulses or series of pulses, is described. Thanks to its modular design, the system can be employed as a single-photon counting or as a coincidence unit in many experimental situations. The box-car is based on a digitally controlled delay line, producing a delay in the interval 17 ns–327.692 μs by 5 ns steps, a fast gate with an opening time adjustable in the range 10 ns–20.0 μs, and an 8-bit binary counter operating at a maximum frequency of 250 MHz. It also employs two pulse amplifiers, accepting negative pulses with a duration larger than 2 ns and an amplitude in the range 30–500 mV, and a fan-out unit. Applications to fluorescence and ion detection in experiments involving pulsed laser sources are briefly discussed.

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Collective effects on ionization of Rydberg sodium atoms by blackbody radiation

Cited by 3 publications

References 15 publications

Model for atomic multiphoton ionization via Rydberg states

Model for atomic multiphoton ionization via Rydberg states

Mutual electron-ion interactions in electron impact ionization of a Ca beam

Modular digital box-car for applications in pulsed laser spectroscopy

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