Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monopole polarization of C60 fullerene shell   We analyze using Poisson equation the spatial distributions of the positive
charge of carbon atomic nuclei shell and negative charge of electron clouds
forming the electrostatic potential of the C60 fullerene shell as a whole. We
consider also the case when an extra positive charge appears inside C60 in
course of e.g. photoionization of an endohedral A@C. We demonstrate that
frequently used radial square-well potential U(r) simulating the C60 shell
leads to nonphysical charge densities of the shell in both cases - without and
with an extra positive charge inside. We conclude that the square well U(r)
modified by adding a Coulomb-potential-like term does not describe the interior
polarization of the shell by the electric charge located in the center of the
C60 shell. We suggest another model potential, namely that of hyperbolic cosine
shape with properly adjusted parameters that is able to describe the monopole
polarization of C60 shell. As a concrete illustration, we have calculated the
photoionization cross-sections of H@C60 taking into account the monopole
polarization of the shell in the frame of suggested model. We demonstrate that
proper account of this polarization does not change the photoionization
cross-section.

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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph