ticket_1156
Last change
on this file since 5778279 was
4788822,
checked in by butler, 7 years ago
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added polydispersity back to fractal (as it used to be, as the
documentation implies and as core_shell_fractal already has). Also
formatted documentation according to current standard for references and
authorship/verification. Fixes #877
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-
Property mode set to
100644
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File size:
783 bytes
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1 | #define INVALID(p) (p.fractal_dim < 0.0) |
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2 | |
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3 | static double |
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4 | form_volume(double radius) |
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5 | { |
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6 | return M_4PI_3 * cube(radius); |
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7 | } |
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8 | |
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9 | static double |
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10 | Iq(double q, |
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11 | double volfraction, |
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12 | double radius, |
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13 | double fractal_dim, |
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14 | double cor_length, |
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15 | double sld_block, |
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16 | double sld_solvent) |
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17 | { |
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18 | const double sq = fractal_sq(q, radius, fractal_dim, cor_length); |
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19 | |
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20 | //calculate P(q) for the spherical subunits |
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21 | const double pq = square(form_volume(radius) * (sld_block-sld_solvent) |
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22 | *sas_3j1x_x(q*radius)); |
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23 | |
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24 | // scale to units cm-1 sr-1 (assuming data on absolute scale) |
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25 | // convert I(1/A) to (1/cm) => 1e8 * I(q) |
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26 | // convert rho^2 in 10^-6 1/A to 1/A => 1e-12 * I(q) |
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27 | // combined: 1e-4 * I(q) |
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28 | |
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29 | return 1.e-4 * volfraction * sq * pq; |
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30 | } |
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31 | |
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