Photodetachment near a metal surface

Zhao, Haixia; Du, Ming

doi:10.1103/physreva.79.023408

Cited by 60 publications

(51 citation statements)

References 30 publications

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“…In this figure, we have considered three typical models with r = 0.1, 0.01 and 0.001. These models are predicted by the general inflationary models, and could be well detected by the future CMB observations [44]. As anticipated, if n t < 0, we always have S ≪ 1, i.e.…”

Section: Forecasts For Fast and Ska Projectssupporting

confidence: 77%

Constraints of relic gravitational waves by pulsar timing arrays: Forecasts for the FAST and SKA projects

et al. 2013

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Measurement of the pulsar timing residuals provides a direct way to detect relic gravitational waves at the frequency f ∼ 1/yr. In this paper, we investigate the constraints on the inflationary parameters, the tensor-to-scalar ratio r and the tensor spectral index nt, by the current and future Pulsar Timing Arrays (PTAs). We find that Five-hundred-meter Aperture Spherical radio Telescope (FAST) in China and the planned Square Kilometer Array (SKA) projects have the fairly strong abilities to test the phantom-like inflationary models. If r = 0.1, FAST could give the constraint on the spectral index nt < 0.56, and SKA gives nt < 0.32. While an observation with the total time T = 20yr, the pulsar noise level σw = 30ns and the monitored pulsar number n = 200, could even constrain nt < 0.07. These are much tighter than those inferred from the current results of Parkers Pulsar Timing Array (PPTA), European Pulsar Timing Array (EPTA) and North American Nanohertz Observatory for Gravitational waves (NANOGrav). Especially, by studying the effects of various observational factors on the sensitivities of PTAs, we found that compared with σw and n, the total observation time T has the most significant effect.

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Section: Forecasts For Fast and Ska Projectssupporting

confidence: 77%

Constraints of relic gravitational waves by pulsar timing arrays: Forecasts for the FAST and SKA projects

et al. 2013

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“…Similar phenomena were predicted for photodetachment in parallel electric and magnetic fields [5][6][7] and other external fields, particularly due to metallic and dielectric surfaces [8][9][10][11]. Experimental observations of spatial interference in static electric fields [12] allow very precise determination of electron affinities [13][14][15].…”

Section: Introductionsupporting

confidence: 63%

Photodetachment microscopy in time-dependent fields

Ambalampitiya

Fabrikant

2017

Phys. Rev. A

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Photodetachment of negative ions in combined laser and low-frequency fields is investigated. The time-dependent Green's function method is used for calculation of electron flux at a macroscopic distance away from the photodetachment source, typical for a photodetachment microscopy experiment. In calculating the electron flux, we use the stationary phase method for the time integral, equivalent to the semiclassical approximation, to compute the time dependent wavefunction. The stationary points t (i) 1 , i = 1, ..., n correspond to time instances of launching of classical trajectories arriving at the detector at a given space-time point (r, t). The number of trajectories n contributing to the electron flux at any point in the classically allowed space-time domain can be controlled by varying the switching interval of the high frequency laser which initiates the photodetachment process. The divergences inherent in the electron flux in the semiclassical treatment are removed by using the uniform Airy approximation near the caustics.

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“…Studies on the energy level shifts of Rydberg atoms and dynamics near a metal surface have also been reported [7][8][9][10][11]. Inspired by these developments, the study of photodetachment near a metal surface was proposed and the cross sections are shown to be oscillatory because of the image charge [12]. Recently we demonstrated that the photodetachment cross sections near the metal surface can be systematically modified [13] by applying a weak electric field pointing away from the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Quantum over-barrier reflection effects manifested in photodetachment cross sections

Yang¹,

Du²

2012

J. Phys. B: At. Mol. Opt. Phys.

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Photodetachment of H − near a potential barrier is studied. A new formula is presented for the cross sections induced by a barrier. The new formula describes two quantum effects near barrier tops. For energies near and above barrier tops, the quantum over-barrier reflection effects are included and the induced oscillations in the cross sections are still prominent; for energies near and below barrier tops, the quantum tunneling across barriers is taken into account and consequently the oscillations are weakened. For energies far away from the barrier tops, the new formula agrees with the standard closed-orbit theory. We demonstrate that a potential barrier of various width and location can be realized by placing a negative ion near a metal surface and applying an electric field pointing to the surface. The width and location of the barrier can be systematically changed by varying the electric field strength and the distance between the negative ion and the surface.Results are also presented for estimating the sizes and locations of aforementioned quantum effects in the cross sections.

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Photodetachment near a metal surface

Cited by 60 publications

References 30 publications

Constraints of relic gravitational waves by pulsar timing arrays: Forecasts for the FAST and SKA projects

Constraints of relic gravitational waves by pulsar timing arrays: Forecasts for the FAST and SKA projects

Photodetachment microscopy in time-dependent fields

Quantum over-barrier reflection effects manifested in photodetachment cross sections

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