Physical Review Letters

Resonant Light Absorption in a Penning-Ionization Collision

James H. Goble, William E. Hollingsworth, John S. Winn

Published Dec 28, 1981• 7 citations

Abstract

The opening of a new channel of excitative Penning ionization by a collision-complex absorption of laser light has been observed in the system Ar*($^{3}P$) + Ca. Two relatively broad resonances at 5958 and 5990 \AA{} were found, corresponding to the production of ${\mathrm{Ca}}^{+}$($5p^{2}P_{\frac{3}{2}}$) and ${\mathrm{Ca}}^{+}$($5p^{2}P_{\frac{1}{2}}$), respectively. The data indicate that the laser-assisted Penning-ionization cross section to these states exceeds that of the field-free ionization to ${\mathrm{Ca}}^{+}$($4p^{2}P_{\frac{3}{2}}$).

DOI: 10.1103/physrevlett.47.1888

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RESONANT LIGHT ABSORPTION BY AN EXCITIVE PENNING IONIZATION COLLISION

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We have observed the opening of a new channel of excitive Penning ionization by the collision complex absorption of laser light in the system Ar*(3p) + Ca.Two relatively broad bands at 5958 and 5990 A were found, corresponding to the production of ca+(5p 2 P 3 ; 2 ) and ca+(_5p 2 P 11 ~), respectively.Preliminary-estim~tes indicate that the laser-ass~sted Penning ionization cross-section exceeds that of the field-free ionization to ca+(4p 2p3/2).

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Physical Review Letters

Resonant Light Absorption in a Penning-Ionization Collision

James H. Goble, William E. Hollingsworth, John S. Winn

Published Dec 28, 1981• 7 citations

Publisher

Abstract

The opening of a new channel of excitative Penning ionization by a collision-complex absorption of laser light has been observed in the system Ar*(

^{3}P

) + Ca. Two relatively broad resonances at 5958 and 5990 \AA{} were found, corresponding to the production of

{\mathrm{Ca}}^{+}

(

5p^{2}P_{\frac{3}{2}}

) and

{\mathrm{Ca}}^{+}

(

5p^{2}P_{\frac{1}{2}}

), respectively. The data indicate that the laser-assisted Penning-ionization cross section to these states exceeds that of the field-free ionization to

{\mathrm{Ca}}^{+}

(

4p^{2}P_{\frac{3}{2}}

DOI: 10.1103/physrevlett.47.1888

Related papers

RESONANT LIGHT ABSORPTION BY AN EXCITIVE PENNING IONIZATION COLLISION

James H. Goble, William E. Hollingsworth, John S. Winn

Aug 1, 19810 citations

Coherence Transfer in a Penning Ionizing Collision

L. D. Schearer, L. A. Riseberg

Modulation of the intensity of light emitted by ${\mathrm{Sr}}^{+}(^{2}P_{\frac{3}{2}})$ ions at the resonance frequency of metastable helium atoms has been observed, demonstrating that coherence has been transferred in the Penning collision. The coherent excitation of the Penning ions suggests that the techniques of "coherence spectroscopy" such as level-crossing and Hanle experiments can be extended to excited states of Penning ions which are currently inaccessible by means of optical excitation.Modulation of the intensity of light emitted by ${\mathrm{Sr}}^{+}(^{2}P_{\frac{3}{2}})$ ions at the resonance frequency of metastable helium atoms has been observed, demonstrating that coherence has been transferred in the Penning collision. The coherent excitation of the Penning ions suggests that the techniques of "coherence spectroscopy" such as level-crossing and Hanle experiments can be extended to excited states of Penning ions which are currently inaccessible by means of optical excitation.

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In rubidium Rydberg states, the collision nD_(5/2)+nD_(5/2)-->(n-2)F_(7/2)+(n+2)P_(3/2) is nearly resonant in the vicinity of n=43. As a result, over a short range of n centered around n approximately 43 the Rydberg-Rydberg interaction potential is quite large and turns from repulsive to attractive [Phys. Rev. A 75, 032712 (2007)10.1103/PhysRevA.75.032712]. We use state-selective field ionization to investigate the effect of this resonance on instantaneous excitation of mixed two-particle states, state-mixing collisions, and Penning ionization. We find that these processes depend on the magnitude and sign of the two-particle interaction potential, and thus on n near the resonance. The large magnitude of the observed state mixing provides evidence for many-body effects.In rubidium Rydberg states, the collision nD_(5/2)+nD_(5/2)-->(n-2)F_(7/2)+(n+2)P_(3/2) is nearly resonant in the vicinity of n=43. As a result, over a short range of n centered around n approximately 43 the Rydberg-Rydberg interaction potential is quite large and turns from repulsive to attractive [Phys. Rev. A 75, 032712 (2007)10.1103/PhysRevA.75.032712]. We use state-selective field ionization to investigate the effect of this resonance on instantaneous excitation of mixed two-particle states, state-mixing collisions, and Penning ionization. We find that these processes depend on the magnitude and sign of the two-particle interaction potential, and thus on n near the resonance. The large magnitude of the observed state mixing provides evidence for many-body effects.

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Paola Bicchi, C. Marinelli, E. Mariotti +2 more

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Observation of Laser-Induced Penning and Associative Ionization in Li-Li Collisions

A. v. Hellfeld, J. Caddick, J. Weiner

We report the direct observation of $^{6}\mathrm{Li}^{+}$ , $^{7}\mathrm{Li}^{+}$ , $^{13}\mathrm{Li}_{2}^{+}$ , $^{14}\mathrm{Li}_{2}^{+}$ arising from single collisions between beams of lithium atoms in the presence of a laser field. Although the relative intensity of atomic ions reflects the natural isotopic abundance, a pronounced enrichment of $^{13}\mathrm{Li}_{2}^{+}$ relative to $^{14}\mathrm{Li}_{2}^{+}$ is observed.We report the direct observation of $^{6}\mathrm{Li}^{+}$, $^{7}\mathrm{Li}^{+}$, $^{13}\mathrm{Li}_{2}^{+}$, $^{14}\mathrm{Li}_{2}^{+}$ arising from single collisions between beams of lithium atoms in the presence of a laser field. Although the relative intensity of atomic ions reflects the natural isotopic abundance, a pronounced enrichment of $^{13}\mathrm{Li}_{2}^{+}$ relative to $^{14}\mathrm{Li}_{2}^{+}$ is observed.

Physical Review LettersMay 22, 197874 citations

The opening of a new channel of excitative Penning ionization by a collision-complex absorption of laser light has been observed in the system Ar*(

^{3}P

) + Ca. Two relatively broad resonances at 5958 and 5990 \AA{} were found, corresponding to the production of

{\mathrm{Ca}}^{+}

(

5p^{2}P_{\frac{3}{2}}

) and

{\mathrm{Ca}}^{+}

(

5p^{2}P_{\frac{1}{2}}

), respectively. The data indicate that the laser-assisted Penning-ionization cross section to these states exceeds that of the field-free ionization to

{\mathrm{Ca}}^{+}

(

4p^{2}P_{\frac{3}{2}}

Modulation of the intensity of light emitted by

{\mathrm{Sr}}^{+}(^{2}P_{\frac{3}{2}})

ions at the resonance frequency of metastable helium atoms has been observed, demonstrating that coherence has been transferred in the Penning collision. The coherent excitation of the Penning ions suggests that the techniques of "coherence spectroscopy" such as level-crossing and Hanle experiments can be extended to excited states of Penning ions which are currently inaccessible by means of optical excitation.

We report the direct observation of

^{6}\mathrm{Li}^{+}

^{7}\mathrm{Li}^{+}

^{13}\mathrm{Li}_{2}^{+}

^{14}\mathrm{Li}_{2}^{+}

arising from single collisions between beams of lithium atoms in the presence of a laser field. Although the relative intensity of atomic ions reflects the natural isotopic abundance, a pronounced enrichment of

^{13}\mathrm{Li}_{2}^{+}

relative to

^{14}\mathrm{Li}_{2}^{+}

is observed.