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Last change
on this file since 82cd844 was
a8d3b4f,
checked in by Kieran Campbell <kieranrcampbell@…>, 12 years ago
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Added star polymer with gaussian statistics model
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Property mode set to
100644
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File size:
1.6 KB
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1 | #ifndef STAR_POLYMER_H |
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2 | #define STAR_POLYMER_H |
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3 | |
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4 | /** |
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5 | This software was developed by Institut Laue-Langevin as part of |
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6 | Distributed Data Analysis of Neutron Scattering Experiments (DANSE). |
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7 | |
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8 | Copyright 2012 Institut Laue-Langevin |
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9 | |
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10 | **/ |
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11 | |
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12 | /** |
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13 | Scattering model class for 'Star polymer with Gaussian statistics' |
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14 | with |
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15 | P(q) = 2/{fv^2} * (v - (1-exp(-v)) + {f-1}/2 * (1-exp(-v))^2) |
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16 | where |
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17 | - v = u^2f/(3f-2) |
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18 | - u = <R_g^2>q^2, where <R_g^2> is the ensemble average radius of |
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19 | gyration squared of an arm |
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20 | - f is the number of arms on the star |
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21 | |
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22 | **/ |
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23 | |
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24 | // [PYTHONCLASS] = StarPolymer |
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25 | // [DISP_PARAMS] = arms, R2, scale, background |
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26 | // [DESCRIPTION] = <text> Scattering model class for 'Star polymer with Gaussian statistics' |
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27 | // with |
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28 | // P(q) = 2/{fv^2} * (v - (1-exp(-v)) + {f-1}/2 * (1-exp(-v))^2) |
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29 | // where |
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30 | // - v = u^2f/(3f-2) |
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31 | // - u = <R_g^2>q^2, where <R_g^2> is the ensemble average radius of |
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32 | // giration squared of an arm |
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33 | // - f is the number of arms on the star |
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34 | // </text> |
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35 | // [FIXED] = |
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36 | // [ORIENTATION_PARAMS] = |
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37 | |
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38 | #include "parameters.hh" |
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39 | |
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40 | class StarPolymer { |
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41 | |
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42 | public: |
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43 | |
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44 | // Model parameters |
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45 | |
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46 | /// Number of arms in the model |
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47 | // [DEFAULT]=arms=3 |
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48 | Parameter arms; |
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49 | |
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50 | /// Ensemble radius of gyration squared of an arm [A] |
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51 | // [DEFAULT]=R2=100.0 [A] |
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52 | Parameter R2; |
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53 | |
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54 | /// Scale factor |
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55 | // [DEFAULT]=scale=1.0 |
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56 | Parameter scale; |
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57 | |
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58 | /// Background [1/cm] |
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59 | // [DEFAULT]=background=0 [1/cm] |
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60 | Parameter background; |
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61 | |
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62 | StarPolymer(); |
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63 | |
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64 | // Operators to get I(q) |
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65 | double operator()(double q); |
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66 | double operator()(double qx, double qy); |
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67 | double calculate_ER(); |
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68 | double calculate_VR(); |
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69 | double evaluate_rphi(double q, double phi); |
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70 | |
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71 | }; |
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72 | |
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73 | |
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74 | |
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75 | #endif |
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