Ion dynamics in laser ablation plumes from selected metals at 355 nm

Thestrup, B.; Toftmann, B.; Schou, Jørgen; Doggett, B.; Lunney, J. G.

doi:10.1016/s0169-4332(02)00321-5

Cited by 82 publications

(62 citation statements)

References 21 publications

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“…The trap was modeled as infinitely long and ion trajectories were calculated in two dimensions in the plane orthogonal to the trap axis. The initial velocity distribution of the ions in the expanding ablation plasma was derived from an experiment [18] performed at laser parameters that were similar to the ones used here, indicating a mean kinetic energy of 100 eV. This is in agreement with observations based on the TOF experiments described in Sections 2 and 3.…”

Section: Investigation Of the Rf Phase Dependence Of The Loading Esupporting

confidence: 86%

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Laser ablation loading of a radiofrequency ion trap

et al. 2012

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The production of ions via laser ablation for the loading of radiofrequency (RF) ion traps is investigated using a nitrogen laser with a maximum pulse energy of 0.17 mJ and a peak intensity of about 250 MW/cm 2 . A time-of-flight mass spectrometer is used to measure the ion yield and the distribution of the charge states. Singly charged ions of elements that are presently considered for the use in optical clocks or quantum logic applications could be produced from metallic samples at a rate of the order of magnitude 10 5 ions per pulse. A linear Paul trap was loaded with Th + ions produced by laser ablation. An overall ion production and trapping efficiency of 10 −7 to 10 −6 was attained. For ions injected individually, a dependence of the capture probability on the phase of the RF field has been predicted. In the experiment this was not observed, presumably because of collective effects within the ablation plume.

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Section: Investigation Of the Rf Phase Dependence Of The Loading Esupporting

confidence: 86%

“…Refs. [18,19]). It has been shown that the distribution of ions over the charge states depends on the laser intensity and shifts to higher charges for higher intensity [19].…”

Section: Introductionmentioning

confidence: 99%

Laser ablation loading of a radiofrequency ion trap

et al. 2012

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“…This model was developed to describe the expansion of neutral gas, but we have obtained good agreement with our data for the ionic component of a laser ablation plume. 21,36 Here we are using measurements of the deposition, due to neutrals and ions, to find the shape of the plume expansion, and these measurements are compared with the theoretical values from Anisimov et al 22 …”

Section: Plume Dynamicsmentioning

confidence: 99%

“…Figure 2 shows the angular distributions for values of the aspect ratio b/a over almost one order of magnitude. The data have been fitted with the angular distribution F( ) from Anisimov's model 21,36 F͑ ͒/F͑ 0 ͒ϭ͑ 1ϩtan 2 ͒ 3/2 ͓1ϩ͑ Z inf /X inf ͒ 2 tan 2 ͔ Ϫ3/2 , ͑1͒…”

Section: A the Flip-over Effectmentioning

confidence: 99%

“…Even at intensities close to the threshold for ablation ͑0.2-1.0 GW/cm 2 ͒ a considerable part of the plume is ionized. [19][20][21] After the end of the laser pulse there is little further transfer of energy or material to the ablation plume. The subsequent adiabatic expansion of the ablation plume in stage ͑iii͒ is largely determined by the shape of the plume at the end of the laser pulse.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of the plume produced by nanosecond ultraviolet laser ablation of metals

2003

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The dynamics of the ablation plume of a partially ionized plasma produced by a nanosecond UV laser with different irradiation spot geometries has been explored. We have used an ensemble of quartz crystal microbalances to make the first systematic and quantitative study of how the shape of the plume varies as the aspect ratio (b/a) of the elliptical laser spot is varied by about a factor of ten. The flip-over effect can be described by the adiabatic expansion model of Anisimov et al. using a value of the adiabatic constant of about ␥ ϭ1.4. We have also studied the forward peaking of the ablation plume for a large number of metals at the same laser fluence. Contrary to earlier reports, we find that the more refractory metals have the broader angular distributions.

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