.. index:: pair: struct; forcefields::Ccl::Dtheta
.. _doxid-structforcefields_1_1_ccl_1_1_dtheta:

struct forcefields::Ccl::Dtheta
===============================

.. toctree::
	:hidden:

Overview
~~~~~~~~

:math:`\Delta \theta` parameter in paper. :ref:`More...<details-structforcefields_1_1_ccl_1_1_dtheta>`


.. ref-code-block:: cpp
	:class: doxyrest-overview-code-block

	#include <ccl.hpp>
	
	struct Dtheta {
		// fields
	
		double :ref:`_1<doxid-structforcefields_1_1_ccl_1_1_dtheta_1af1e0ed1c3fb093e3019051131dd423c3>`;
		double :ref:`_2<doxid-structforcefields_1_1_ccl_1_1_dtheta_1a2a0374de6dd092305df7c273e7b3bb02>`;
		double :ref:`_3<doxid-structforcefields_1_1_ccl_1_1_dtheta_1a8f31ca9cdb495a066f235ca260336736>`;
		double :ref:`n1<doxid-structforcefields_1_1_ccl_1_1_dtheta_1a550f4ff988a5b5632739daba5095d76a>`[3];
		double :ref:`n2<doxid-structforcefields_1_1_ccl_1_1_dtheta_1a0e61ee56593f488e21c2101dd97935f2>`[3];
	};
.. _details-structforcefields_1_1_ccl_1_1_dtheta:

Detailed Documentation
~~~~~~~~~~~~~~~~~~~~~~

:math:`\Delta \theta` parameter in paper.



.. rubric:: See also:

:ref:`forcefields::Ccl <doxid-classforcefields_1_1_ccl>`

Fields
------

.. index:: pair: variable; _1
.. _doxid-structforcefields_1_1_ccl_1_1_dtheta_1af1e0ed1c3fb093e3019051131dd423c3:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	double _1

Delta theta.

.. index:: pair: variable; _2
.. _doxid-structforcefields_1_1_ccl_1_1_dtheta_1a2a0374de6dd092305df7c273e7b3bb02:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	double _2

(Delta theta)^2

.. index:: pair: variable; _3
.. _doxid-structforcefields_1_1_ccl_1_1_dtheta_1a8f31ca9cdb495a066f235ca260336736:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	double _3

(Delta theta)^3

.. index:: pair: variable; n1
.. _doxid-structforcefields_1_1_ccl_1_1_dtheta_1a550f4ff988a5b5632739daba5095d76a:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	double n1[3]

Convert derivative to force. The vector has should have direction of the force applied on hydrogen one. The norm of the vector should be :math:`\frac{1}{r_1}`. This way multiplying the vector by the moment gives the force on hydrogen 1.

Reminder:

The moment is the equivalent of the force for angular coordinates:

.. math::

	M=-\frac{dE}{d\theta}

The moment is related to the force:

.. math::

	\mathbf M=\mathbf r \times \mathbf F

The vector *n* is defined as:

.. math::

	\mathbf n=\frac{\mathbf F}{M}

and

.. math::

	|\mathbf n|=\frac{1}{r}

.. index:: pair: variable; n2
.. _doxid-structforcefields_1_1_ccl_1_1_dtheta_1a0e61ee56593f488e21c2101dd97935f2:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	double n2[3]

Same as :ref:`n1 <doxid-structforcefields_1_1_ccl_1_1_dtheta_1a550f4ff988a5b5632739daba5095d76a>` but for hydrogen 2.