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"""
Module containing convenient unit conversion factors, including
* ``radians_per_fs_to_THz``
* ``radians_per_fs_to_meV``
* ``radians_per_fs_to_invcm``
* ``THz_to_meV``
* ``THz_to_invcm``
* ``meV_to_invcm``
* ``Dalton_to_dmu`` dmu is Dynasor Mass Unit
Here, for example, ``radians_per_fs_to_invcm`` can be used to convert an angular frequency in units
of radians/fs to a frequency in 1/cm, as demonstrated by the code snippet below.
.. highlight:: python
.. code-block:: python
# converting the angular frequencies (omega) in a Sample object to frequencies in inverse cm
from dynasor.units import radians_per_fs_to_invcm
frequencies_invcm = sample.omega * radians_per_fs_to_invcm
# converting frequencies from inverse cm to meV
from dynasor.units import meV_to_invcm
frequencies_meV = frequencies_invcm / meV_to_invcm
"""
from math import pi
from ase.units import _c, invcm, fs
# Frequencies
meV_to_invcm = 1 / invcm / 1e3
THz_to_invcm = 1e12 / _c / 1e2
THz_to_meV = 1e13 * invcm / _c
# Angular frequencies
radians_per_fs_to_THz = 1000 / 2 / pi
radians_per_fs_to_meV = radians_per_fs_to_THz * THz_to_meV
radians_per_fs_to_invcm = radians_per_fs_to_THz * THz_to_invcm
# Mass
Dalton_to_dmu = 1/fs**2
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