A compact laser-driven plasma accelerator for megaelectronvolt-energy neutral atoms

Rajeev, R.; Trivikram, T. Madhu; Rishad, K. P. M.; Narayanan, V.; Krishnakumar, E.; Krishnamurthy, M.

doi:10.1038/nphys2526

Cited by 93 publications

(71 citation statements)

References 43 publications

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“…We conclude that in our conditions the role of excited atoms in the electron capture or loss processes forming negative ions and neutral atoms is negligible. This conclusion is also valid for the conditions of the experiments described by Rajeev et al 4,5 as their ensembles of clusters have a similar average molecular density and thickness as our target.…”

Section: Measurements and Discussionsupporting

confidence: 66%

“…4,5 We therefore conclude that in our conditions the role of excited atoms in the electron capture or loss processes forming negative ions and neutral atoms is negligible.…”

Section: Discussionmentioning

confidence: 93%

“…In fact, the efficient electron transfer from Rydberg excited clusters to projectile ions within a sheath around the laser focus was suggested recently 4,5 to the conditions of the work reported in Ref. 1, the cluster medium used in Refs.…”

mentioning

confidence: 99%

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New source of MeV negative ion and neutral atom beams

Ter‐Avetisyan

Braenzel

Schnürer

et al. 2015

Review of Scientific Instruments

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The scenario of “electron-capture and -loss” was recently proposed for the formation of negative ion and neutral atom beams with MeV kinetic energies. However, it does not explain why the formation of negative ions in a liquid spray is much more efficient than with an isolated atom. The role of atomic excited states in the charge-exchange processes is considered, and it is shown that it cannot account for the observed phenomena. The processes are more complex than the single electron-capture and -loss approach. It is suggested that the shell effects in the electronic structure of the projectile ion and/or target atoms may influence the capture/loss probabilities.

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Section: Measurements and Discussionsupporting

confidence: 66%

“…4,5 We therefore conclude that in our conditions the role of excited atoms in the electron capture or loss processes forming negative ions and neutral atoms is negligible.…”

Section: Discussionmentioning

confidence: 93%

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New source of MeV negative ion and neutral atom beams

Ter‐Avetisyan

Braenzel

Schnürer

et al. 2015

Review of Scientific Instruments

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“…Recently this was exploited to accelerate neutral atoms upto MeV energies 8 . Nano-clusters exposed to intense laser pulses leads to a very strong ionization.…”

Section: Figurementioning

confidence: 99%

“…High energy hydrogen atom beams play an important role in Tokamak diagnostics 5 . The methods used to accelerate neutral atom have seen very little progress until quite recently [6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

Mass selection in laser-plasma ion accelerator on nanostructured surfaces

et al. 2017

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Recent advances in high-intensity laser-produced plasmas have demonstrated their potential as compact charge particle accelerators. Unlike conventional accelerators, transient quasi-static charge separation acceleration fields in laser produced plasmas are highly localized and orders of magnitude larger. Manipulating these ion accelerators, to covert the fast ions to neutral atoms with little change in momentum, transform these to a bright source of MeV atoms. The emittance of the neutral atom beam would be similar to that expected for an ion beam. Since intense laser-produced plasmas have been demonstrated to produce high-brightness-low-emittance beams, it is possible to envisage generation of high-flux, low-emittance, high energy neutral atom beams in length scale of less than a milimeter. Here, we show a scheme where more than 80% of the fast ions are reduced to energetic neutral atoms and demonstrate the feasibility of a high energy neutral atom accelerator that could significantly impact applications in neutral atom lithography and diagnostics.

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Mass spectrometric and charge density studies of organometallic clusters photoionized by gigawatt laser pulses

Badani

Das

Sharma

et al. 2015

Mass Spectrometry Reviews

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Clusters on exposure to nanosecond laser pulses of gigawatt intensity exhibit a variety of photo-chemical processes such as fragmentation, intracluster reaction, ionization, Coulomb explosion, etc. Present article summarizes the experimental results obtained in our laboratory utilizing time-of-flight mass spectrometer which deal with one such aspect of cluster photochemistry related to generation of multiply charged atomic ions upon excessive ionization of cluster constituents (Coulomb explosion) at low intensity laser field (∼10 W/cm ). To understand the mechanism of laser-cluster interaction, laser as well as cluster parameters were varied. Mass spectrometric studies were carried out at different laser wavelength as well as varying the nature of cluster constituents, backup pressure, nozzle diameter, etc. In addition, charge density measurements were also preformed to get information about the total number of ions generated upon laser-cluster interaction as a function of laser wavelength. In case of pure molecular clusters, the charge state of atomic ions as well as charge density was observed to enhance with increasing laser wavelength, signifying efficient coupling of the cluster medium with nanosecond laser pulse at longer wavelength. While in case of clusters doped with species having comparatively lower ionization energy, the efficiency of laser-cluster interaction was less, in contrast to studies carried out using femtosecond lasers. Results obtained in the present work have been rationalized on the basis of proposed three-stage cluster ionization mechanism, that is, multiphoton ionization ignited-inverse Bremsstrahlung heating and electron ionization. © 2015 Wiley Periodicals, Inc. Mass Spec Rev. 36:188-212, 2017.

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A compact laser-driven plasma accelerator for megaelectronvolt-energy neutral atoms

Cited by 93 publications

References 43 publications

New source of MeV negative ion and neutral atom beams

New source of MeV negative ion and neutral atom beams

Mass selection in laser-plasma ion accelerator on nanostructured surfaces

Mass spectrometric and charge density studies of organometallic clusters photoionized by gigawatt laser pulses

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