Physical Review A

Excitation of inner-shell electrons by energy-pooling collisions

C. Gabbanini, A. Lucchesini, Silvia Gozzini, L. Moi

Published Jul 1, 1992• 11 citations

Abstract

We report an observation of energy-pooling collisions in a rare-earth-metal atomic element (Yb). The collisional process populates atomic states having different electronic configurations. Population transfer from closed inner-shell states to open ones is put in evidence, and its rate is comparable to the other observed collisional processes.

DOI: 10.1103/physreva.46.r9

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Physical Review A

Excitation of inner-shell electrons by energy-pooling collisions

C. Gabbanini, A. Lucchesini, Silvia Gozzini, L. Moi

Published Jul 1, 1992• 11 citations

Publisher

Abstract

DOI: 10.1103/physreva.46.r9

Related papers

Energy-pooling ionization via an autoionizing state in indium

Paola Bicchi, A. Kopystyńska, M. Meucci +1 more

Energy-transfer collisions between two 6 $^{2}$ ${\mathit{S}}_{1/2}$ laser-excited indium atoms leading either to ionization of one of the colliding atoms or to population of its ${\mathit{n}}^{2}$ P Rydberg states, have been studied. Atomic lines corresponding to the 5s5 ${\mathit{p}}^{2}$ $^{2}$ D\ensuremath{\rightarrow}5${\mathit{s}}^{2}$6p $^{2}$ ${\mathit{P}}_{1/2,3/2}$ interconfiguration transitions have been recorded as evidence of the energy-pooling ionization via an autoionizing state. Atomic lines corresponding to the ${\mathit{n}}^{2}$ P\ensuremath{\rightarrow}6 $^{2}$ S transitions for n=9, 10, and 11 as well as to the 5 $^{2}$ D\ensuremath{\rightarrow}5 $^{2}$ P transitions have proven that the population of highly excited indium atomic states is through the energy-poolimg collisions.Energy-transfer collisions between two 6 $^{2}$${\mathit{S}}_{1/2}$ laser-excited indium atoms leading either to ionization of one of the colliding atoms or to population of its ${\mathit{n}}^{2}$P Rydberg states, have been studied. Atomic lines corresponding to the 5s5${\mathit{p}}^{2}$ $^{2}$D\ensuremath{\rightarrow}5${\mathit{s}}^{2}$6p $^{2}$${\mathit{P}}_{1/2,3/2}$ interconfiguration transitions have been recorded as evidence of the energy-pooling ionization via an autoionizing state. Atomic lines corresponding to the ${\mathit{n}}^{2}$P\ensuremath{\rightarrow}6 $^{2}$S transitions for n=9, 10, and 11 as well as to the 5 $^{2}$D\ensuremath{\rightarrow}5 $^{2}$P transitions have proven that the population of highly excited indium atomic states is through the energy-poolimg collisions.

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Using stepwise excitation of the cesium 8S atoms level in Cs vapor,several collisional and radiative processes have been identified from the intensities and spectra of the Cs fluorescence.The 5D state was populated by 8S→7P→5D transitions.In cesium densities 1016-1017?cm-3,the energy pooling collisions 5D+5D→nL+6S(nL=9D,11S,7F are studied.Since the 5D→6P(3.0-3.6 μm) fluorescence could not be detected with this experiment,the EP rate coefficients have been measured relative to the known rate coefficient of the collision,i.e.,6P+5D→6S+7D.The excited-atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single-mode laser beam,tuned to 6P3/2→8S1/2 transition,which could be translated parallel to the pump beam.The excited atom densities are combined with measured fluorescene ratios to determine cross sections for the cesium energy pooling process.The average values(in units of 10-10?cm3s-1) for nL=9D,11S and 7F are 8.4±4.2,7.3±3.6,and 9.7±4.8,respectively.Influence on k11S and k7F of the energy transfer process 11S+6S7F+6S is also dicussed.Using stepwise excitation of the cesium 8S atoms level in Cs vapor,several collisional and radiative processes have been identified from the intensities and spectra of the Cs fluorescence.The 5D state was populated by 8S→7P→5D transitions.In cesium densities 1016-1017?cm-3,the energy pooling collisions 5D+5D→nL+6S(nL=9D,11S,7F are studied.Since the 5D→6P(3.0-3.6 μm) fluorescence could not be detected with this experiment,the EP rate coefficients have been measured relative to the known rate coefficient of the collision,i.e.,6P+5D→6S+7D.The excited-atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single-mode laser beam,tuned to 6P3/2→8S1/2 transition,which could be translated parallel to the pump beam.The excited atom densities are combined with measured fluorescene ratios to determine cross sections for the cesium energy pooling process.The average values(in units of 10-10?cm3s-1) for nL=9D,11S and 7F are 8.4±4.2,7.3±3.6,and 9.7±4.8,respectively.Influence on k11S and k7F of the energy transfer process 11S+6S7F+6S is also dicussed.

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Energy-transfer collisions between two 6

^{2}

{\mathit{S}}_{1/2}

laser-excited indium atoms leading either to ionization of one of the colliding atoms or to population of its

{\mathit{n}}^{2}

P Rydberg states, have been studied. Atomic lines corresponding to the 5s5

{\mathit{p}}^{2}

^{2}

D\ensuremath{\rightarrow}5${\mathit{s}}^{2}$6p

^{2}

{\mathit{P}}_{1/2,3/2}

interconfiguration transitions have been recorded as evidence of the energy-pooling ionization via an autoionizing state. Atomic lines corresponding to the

{\mathit{n}}^{2}

P\ensuremath{\rightarrow}6

^{2}

S transitions for n=9, 10, and 11 as well as to the 5

^{2}

D\ensuremath{\rightarrow}5

^{2}

P transitions have proven that the population of highly excited indium atomic states is through the energy-poolimg collisions.

Rate coefficients for energy-pooling collisions between low-lying excited states of Ba have been measured. The 6s6p

{(}^{3}

{\mathit{P}}_{1}

) level in Ba is pumped by a cw diode laser, and radiative decay and collisions with buffer-gas atoms also populate the 5d6s

{(}^{1}

D) and 5d6s

{(}^{3}

D) metastable levels. The densities of these low-lying excited states are measured by the absorption of lines from a Ba hollow-cathode lamp, and the states populated by energy-pooling collisions are studied by comparing their fluorescence intensity to that of the laser-excited level. The rate coefficients are on the order of gas-kinetic rates, and they are not strongly dependent on energy defect, spin changes, or angular-momentum changes.