Update manual

smaret · May 16, 2015 · f288003 · f288003
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diff --git a/doc/usermanual/usermanual.rst b/doc/usermanual/usermanual.rst
@@ -142,6 +142,23 @@ computed by multiplying the densities of the reactants by :math:`k`.
 Similarly the destruction rate of each reactant is computed by
 multiplying the densities of the reactants by :math:`k`. Reactions in
 Astrochem may have up to three reactants, and four products.
+
+Ion - polar molecule reactions rates can be better described by one of
+the two expressions (for more details, see the `KIDA database
+documentation <http://bit.ly/1KBAHvq>`_):
+
+.. math:: k = \alpha \beta \left( 0.62 + 0.4767 \gamma \left(
+          \frac{300}{T} \right)^{0.5} \right)
+   :label: ion-pol1
+
+or:
+
+.. math:: k = \alpha \beta \left( 1 + 0.0967 \gamma \left(
+          \frac{300}{T}^0.5 \right) + \frac{\gamma^2}{10.526}
+          \frac{300}{T} \right)^{0.5}
+   :label: ion-pol2
+
+These two types of reactions are implemented in Astrochem.
 
 Cosmic-ray ionization
 ~~~~~~~~~~~~~~~~~~~~~
@@ -1133,6 +1150,10 @@ example you may want to identify gas-phase reactions by numbers between
    +---------------+---------------------------------------------------------------+
    | 13            | Photo-ionization, Photo-dissociation                          |
    +---------------+---------------------------------------------------------------+
+   | 14            | Ion - polar molecule reactions (type 1)                       |
+   +---------------+---------------------------------------------------------------+
+   | 15            | Ion - polar molecule reactions (type 2)                       |
+   +---------------+---------------------------------------------------------------+
    | 20            | Freeze-out on grains                                          |
    +---------------+---------------------------------------------------------------+
    | 21            | Thermal desorption                                            |
@@ -1168,6 +1189,10 @@ internal time step.
    +-------------+--------------------------+------------------+------------------------+----------------+
    |          13 | :eq:`photo-ionization`   | :math:`\alpha`   | \-                     | \-             |
    +-------------+--------------------------+------------------+------------------------+----------------+
+   |          14 | :eq:`ion-pol1`           | :math:`\alpha`   | :math:`\beta`          | :math:`\gamma` |
+   +-------------+--------------------------+------------------+------------------------+----------------+
+   |          15 | :eq:`ion-pol2`           | :math:`\alpha`   | :math:`\beta`          | :math:`\gamma` |
+   +-------------+--------------------------+------------------+------------------------+----------------+
    |          20 | :eq:`depletion`          | :math:`S`        | :math:`m/m_\mathrm{H}` | \-             |
    +-------------+--------------------------+------------------+------------------------+----------------+
    |          21 | :eq:`thermal-desorption` | \-               | :math:`m/m_\mathrm{H}` | :math:`E_{b}`  |