.. index:: pair: struct; chill::QlmAtom
.. _doxid-structchill_1_1_qlm_atom:

struct chill::QlmAtom
=====================

.. toctree::
	:hidden:

Overview
~~~~~~~~

This is the local orientational bond order parameter :math:`q_{lm}`, of length :math:`2l+1`. :ref:`More...<details-structchill_1_1_qlm_atom>`

.. _details-structchill_1_1_qlm_atom:

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

This is the local orientational bond order parameter :math:`q_{lm}`, of length :math:`2l+1`.

This complex vector is averaged over the four nearest neighbours, according to the following equation:

.. math::

	q_{lm}(i) = \frac{1}{N_b(i)} \Sigma_{j=1}^{N_b(i)} Y_{lm}(r_{ij})

Here, :math:`N_b(i)=4` is the number of nearest neighbours for the molecule :math:`i`. This struct contains specifically:

* A complex vector of length :math:`2l+1`, calculated according to the equation above