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Radiation Physics and Chemistry

Excitation of the nP→52S1/2 series in dense Ga vapour via energy-pooling ionisation

Paola Bicchi, S. Barsanti

Published May 1, 2003• 0 citations
Publisher
DOI
10.1016/s0969-806x(03)00261-5

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Atomic population redistribution in a dense Ga vapour proceeding via energy pooling ionization induced by resonant laser-assisted collisions

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In this paper we report on the atomic population redistribution originating from the ionization that takes place in a dense Ga vapour kept in quartz cells and resonantly excited by laser radiation, in the collisions between two excited atoms. This ionization process is known as energy-pooling ionization (EPI). The electron/ion recombination that takes place in the low density plasma produced gives rise to population in the atomic Rydberg levels and from the latter via cascade transitions to lower lying ones. We have monitored the fluorescences relative to the radiative emissions from such levels, namely those corresponding to the n P → 5S 1/2 series, with 9 ≤ n ≤ 26, and the 4D → 4P 1/2,3/2 transitions. Their characteristics testify to their origin as being due to the EPI process. Further confirmation is obtained by performing a time-resolved analysis of such fluorescences, whose appearance and time evolution is strongly influenced by the dynamics of the process. The effect of the introduction of a few Torr of buffer gas inside the quartz cell, resulting in the quenching of all the fluorescences for n ≥ 12, is also discussed.

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We report on the electronic detection of the energy-pooling ionization (EPI) process in resonantly laser-excited gallium vapour. The formation of electrons and ions in the collision of two Ga atoms excited to the 5 2 S 1/2 level is analysed as a function of several different parameters such as the laser power density, the atomic density and the temperature. The influence of the strong chemical reactivity of Ga at high temperatures on the process is also evidenced. Finally the cross section for the EPI process is derived from the electronic signals detected. It turns out to be (1.1±0.5)×10 -15 cm 2 , a large value that states EPI as a very efficient process in Ga vapour.

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The production of Rydberg atoms via collisions in a resonantly laser excited dense In vapour is reported. When a dense In vapour confined in a quartz cell, whose temperature is raised above 820 °C, is excited by 100 kW cm−2 laser pulses at 410.3 nm, resonant with the fundamental transition 5 2P1/2 → 6 2S1/2, the fluorescence spectrum shows radiative emissions from Rydberg states, namely those corresponding to the n 2P → 6 2S1/2 series with 9 ≤ n ≤ 23. Fluorescences corresponding to the 5 2D → 5 2P1/2,3/2 transitions are also observed. Analysis of these signals' intensity as a function of several different experimental parameters, such as the atomic density and the laser power density, indicates that the population in the Rydberg levels is produced mainly by energy pooling collisions (EPC). The EPC cross section for the population of the Rydberg levels is also given. The influence on these effects of the presence of a fine structure in the In ground state (5 2P1/2,3/2) is also discussed, as well as the presence of a buffer gas inside the quartz cell.

Journal of Physics B Atomic Molecular and Optical Physics•Jan 6, 2005•2 citations

Energy Pooling Processes in Sr Following Resonant Excitation of the 5 1P State

Dieter Gruber, Ursula Domiaty, Laurentius Windholz +1 more

•Jan 1, 1996•0 citations
In this paper we report on the atomic population redistribution originating from the ionization that takes place in a dense Ga vapour kept in quartz cells and resonantly excited by laser radiation, in the collisions between two excited atoms. This ionization process is known as energy-pooling ionization (EPI). The electron/ion recombination that takes place in the low density plasma produced gives rise to population in the atomic Rydberg levels and from the latter via cascade transitions to lower lying ones. We have monitored the fluorescences relative to the radiative emissions from such levels, namely those corresponding to the n P → 5S 1/2 series, with 9 ≤ n ≤ 26, and the 4D → 4P 1/2,3/2 transitions. Their characteristics testify to their origin as being due to the EPI process. Further confirmation is obtained by performing a time-resolved analysis of such fluorescences, whose appearance and time evolution is strongly influenced by the dynamics of the process. The effect of the introduction of a few Torr of buffer gas inside the quartz cell, resulting in the quenching of all the fluorescences for n ≥ 12, is also discussed.
We report on the electronic detection of the energy-pooling ionization (EPI) process in resonantly laser-excited gallium vapour. The formation of electrons and ions in the collision of two Ga atoms excited to the 5 2 S 1/2 level is analysed as a function of several different parameters such as the laser power density, the atomic density and the temperature. The influence of the strong chemical reactivity of Ga at high temperatures on the process is also evidenced. Finally the cross section for the EPI process is derived from the electronic signals detected. It turns out to be (1.1±0.5)×10 -15 cm 2 , a large value that states EPI as a very efficient process in Ga vapour.
The production of Rydberg atoms via collisions in a resonantly laser excited dense In vapour is reported. When a dense In vapour confined in a quartz cell, whose temperature is raised above 820 °C, is excited by 100 kW cm−2 laser pulses at 410.3 nm, resonant with the fundamental transition 5 2P1/2 → 6 2S1/2, the fluorescence spectrum shows radiative emissions from Rydberg states, namely those corresponding to the n 2P → 6 2S1/2 series with 9 ≤ n ≤ 23. Fluorescences corresponding to the 5 2D → 5 2P1/2,3/2 transitions are also observed. Analysis of these signals' intensity as a function of several different experimental parameters, such as the atomic density and the laser power density, indicates that the population in the Rydberg levels is produced mainly by energy pooling collisions (EPC). The EPC cross section for the population of the Rydberg levels is also given. The influence on these effects of the presence of a fine structure in the In ground state (5 2P1/2,3/2) is also discussed, as well as the presence of a buffer gas inside the quartz cell.