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Dielectric properties of laser exploded clusters
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10.1063/1.2712814
/content/aip/journal/pop/14/3/10.1063/1.2712814
http://aip.metastore.ingenta.com/content/aip/journal/pop/14/3/10.1063/1.2712814
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Comparison of electron density extracted from the PIC simulation (dotted line) and the result of our equilibrium calculation with parameters and extracted from the PIC simulation (solid line) on the left axis. The inset shows the same comparison on a vertical log-scale. The corresponding electrostatic potential is plotted on the right scale.

Image of FIG. 2.
FIG. 2.

Three sample electron trajectories. The cluster radius here is .

Image of FIG. 3.
FIG. 3.

The two ion charge density profiles extracted from a PIC code for use in our calculation. The sharp ion density profile (solid) has a very steep gradient at the cluster boundary. The diffuse ion density profile (dotted) trails off smoothly as it approaches the calculation boundary.

Image of FIG. 4.
FIG. 4.

Comparison of the real (top graphs) and imaginary (bottom graphs) components of the polarizability spectra from our time-domain kinetic calculation (solid line) and frequency domain fluid calculation (dotted line). A small temperature, , was used in the kinetic calculation. (a) A smoothing factor of is used; (b) the smoothing factor is .

Image of FIG. 5.
FIG. 5.

Comparison of the imaginary component of the polarizability spectra from our time-domain kinetic calculation with frozen particles (solid line), and frequency domain fluid calculation (dotted line). In both cases a smoothing factor of is used. The number of electrons used was and the grid spacing was reduced by a factor 5 to eliminate noise associated with fixed particle location.

Image of FIG. 6.
FIG. 6.

Real (a), and imaginary (b) polarizability spectra resulting from the sharp ion profile. Each spectrum has a vertical offset of and corresponds to a different electron temperature as labeled on the right. The arrow demarcates where a cold-cluster dielectric resonance would be expected.

Image of FIG. 7.
FIG. 7.

Contours of electron radial (left) and angular (right) frequencies in the energy-angular momentum plane. represents a contour level of 0.11. The top graphs are at and the bottom graphs at . The equilibrium distribution function is plotted on the left to elucidate where the electrons are concentrated.

Image of FIG. 8.
FIG. 8.

Resonant electron bands in the energy-angular momentum plane for the sharp ion profile and . (a) Bands determined by the condition , where corresponds to a wavelength of . The width is chosen for illustrative purposes. (b) Bands determined by the condition , where . The speckles are a numerical artifact.

Image of FIG. 9.
FIG. 9.

Real (a), and imaginary (b) polarizability spectra resulting from the diffuse ion profile. Each spectrum has a vertical offset of and corresponds to a different electron temperature as labeled on the right. The arrow demarcates where a cold-cluster dielectric resonance would be expected.

Image of FIG. 10.
FIG. 10.

Resonant electron bands in the energy-angular momentum plane for the diffuse ion profile with . (a) Bands determined by the condition , where corresponds to a wavelength of . The width is chosen for illustrative purposes. (b) Bands determined by the condition , where . The speckles are a numerical artifact.

Image of FIG. 11.
FIG. 11.

Comparison of the imaginary component of the polarizability resulting from the sharp (dotted) and diffuse (solid) ion profile at two different temperatures. The top picture has and the bottom .

Image of FIG. 12.
FIG. 12.

(a) On the left axis, the intensity profile (solid) used in irradiating the cluster in the PIC simulation. On the right axis (log scale), hot and cold electron temperatures extracted from the PIC simulation as a function of time (dotted) right axis. (b) On the left axis (log scale), the fraction of hot electrons extracted from the PIC simulation as a function of time (solid). On the right axis, the rms electron radius of the cluster (dotted).

Image of FIG. 13.
FIG. 13.

Real (a), and imaginary (b) polarizability spectra at different times through the cluster evolution as labeled on the right. Each spectrum has a vertical offset of . The spectra were smoothed by a factor . The arrow demarcates where a cold-cluster dielectric resonance would be expected.

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/content/aip/journal/pop/14/3/10.1063/1.2712814
2007-03-28
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dielectric properties of laser exploded clusters
http://aip.metastore.ingenta.com/content/aip/journal/pop/14/3/10.1063/1.2712814
10.1063/1.2712814
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