Anisotropic negative-ion emission from cluster nanoplasmas

Rajeev, R. ; Dalui, Malay ; Trivikram, T. Madhu ; Rishad, K. P. M. ; Krishnamurthy, M. (2015) Anisotropic negative-ion emission from cluster nanoplasmas Physical Review A: covering atomic, molecular, and optical physics and quantum information, 91 (6). Article ID 063403. ISSN 2469-9926

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Recent experiments have shown that the Enhanced Charge Transfer by Rydberg Excited Clusters (ECTREC) reduces the highly charged ions very efficiently to neutral atoms and negative ions with little loss of momentum. Neutral-atom emission is anisotropic with respect to the laser polarization and the anisotropy is larger than that of the ion emission from Coulomb explosion of isolated single clusters. In such a scenario, it is expected that the negative-ion emission (like neutrals) should be anisotropic and have larger propensity along the laser polarization than in the perpendicular direction. Further, it may be anticipated that negative-ion emission is more anisotropic than neutral-atom emission if ECTREC is taken in to account. We demonstrate that the negative-ion emission is anisotropic. Contrary to expectations, the negative-ion emission anisotropy is not more than that of the neutral-atom emission. We show that this can be rationalized if low-energy (about 10 eV) electron collisional detachment of the negative ions is taken into account. Electron collisional detachment depletes the negative-ion yield preferentially along the laser polarization direction and reduces the negative-ion emission anisotropy.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:102718
Deposited On:02 Feb 2018 04:36
Last Modified:02 Feb 2018 04:36

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