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Strong Laser Field Induced Modifications of Electron-Transfer Processes in Ne⁺-He Collisions

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Lu Z., Sun Y., Ma L., Liu J.

Acta Physica Polonica A

2017

vol. 131

issue 6

1519-1524

A strong laser field ( ≈ 10¹⁵ W/cm²) induced low-collisional-energy charge transfer process in Ne⁺-He system is explored. In the low collisional energy regime, the cross-section can be ≈ 10¯¹⁷ cm² which is about two orders of magnitude higher than the collision-only process. With increasing collisional energy the cross-section curve displays flattens and the charge capture tends to be practically independent of the laser detuning. In addition, we find that the capture probability in this Ne⁺-He system varies significantly with the laser polarization angle.

Laser Induced Quadrupole-Dipole Collisional Energy Transfer in Ca-Sr

100%

Lu Z., Sun Y., Ma L., Liu J.

Acta Physica Polonica A

2015

vol. 127

issue 6

1620-1624

A laser induced quadrupole-dipole collisional energy transfer system of Ca-Sr is proposed and the four-state quadrupole-dipole laser induced collisional energy transfer model is presented. The excitation spectrum calculated for the Ca-Sr system is characterized by a doublet structure and a width which is about twice wider than the dipole-dipole laser induced collisional energy transfer results. Calculating results show that the full width at half peak of the profile becomes larger and the quasi-static wing tends to be a broad flat as the field intensity increases, which are different from the reported results of dipole-dipole laser induced collisional energy transfer processes, dipole-quadrupole and quadrupole-quadrupole. A cross-section of 2.48× 10^{-14} cm^{2} at a laser field intensity of 5.21× 10^{7} V/m is obtained which indicates that the quadrupole-dipole process can be an effective way to transfer energy selectively.

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2 Acta Physica Polonica A

1 2017

1 2015

2 Liu J.

2 Lu Z.

2 Ma L.

2 Sun Y.

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Strong Laser Field Induced Modifications of Electron-Transfer Processes in Ne⁺-He Collisions

Laser Induced Quadrupole-Dipole Collisional Energy Transfer in Ca-Sr