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.. _astroquery_atomic:
**************************************
Atomic Line List (`astroquery.atomic`)
**************************************
Getting started
===============
"Atomic Line List" is a collection of more than 900,000 atomic transitions
in the range from 0.5 Å to 1000 µm (source_). ``AtomicLineList`` has 13
parameters of which all are optional. In the example below, only a
restricted set of the available parameters is used to keep it simple:
``wavelength_range``, ``wavelength_type``, ``wavelength_accuracy`` and
``element_spectrum``. The respective web form for Atomic Line List can be
found at http://www.pa.uky.edu/~peter/atomic/. As can be seen there, the
first form fields are "Wavelength range" and "Unit". Because astroquery
encourages the usage of AstroPy units, the expected type for the parameter
``wavelength_range`` is a tuple with two AstroPy quantities in it. This has
the positive side-effect that even more units will be supported than by just
using the web form directly.
In the following Python session you can see the ``atomic`` package in
action. Note that Hz is actually not a supported unit by Atomic Line List,
the atomic package takes care to support all spectral units.
.. doctest-remote-data::
>>> from astropy import units as u
>>> from astroquery.atomic import AtomicLineList
>>> wavelength_range = (15 * u.nm, 1.5e+16 * u.Hz)
>>> AtomicLineList.query_object(wavelength_range=wavelength_range, wavelength_type='Air',
... wavelength_accuracy=20, element_spectrum='C II-IV')
<Table length=3>
LAMBDA VAC ANG SPECTRUM TT ... J J A_ki LEVEL ENERGY CM 1
float64 str4 str2 ... str5 float64 str18
-------------- -------- ---- ... ----- ----------- ------------------
196.8874 C IV E1 ... 1/2-* 91300000.0 0.00 - 507904.40
197.7992 C IV E1 ... 1/2-* 118000000.0 0.00 - 505563.30
199.0122 C IV E1 ... 1/2-* 157000000.0 0.00 - 502481.80
Troubleshooting
===============
If you are repeatedly getting failed queries, or bad/out-of-date results, try clearing your cache:
.. code-block:: python
>>> from astroquery.atomic import AtomicLineList
>>> AtomicLineList.clear_cache()
If this function is unavailable, upgrade your version of astroquery.
The ``clear_cache`` function was introduced in version 0.4.7.dev8479.
Reference/API
=============
.. automodapi:: astroquery.atomic
:no-inheritance-diagram:
.. _source: http://www.pa.uky.edu/~peter/atomic/documentation.html
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