1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
.. doctest-skip-all
.. _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.
.. code-block:: python
>>> 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_type='Air', wavelength_accuracy=20, element_spectrum='C II-IV')
<Table rows=3 names=('LAMBDA VAC ANG','SPECTRUM','TT','TERM','J J','LEVEL ENERGY CM 1')>
array([(196.8874, 'C IV', 'E1', '2S-2Po', '1/2-*', '0.00 - 507904.40'),
(197.7992, 'C IV', 'E1', '2S-2Po', '1/2-*', '0.00 - 505563.30'),
(199.0122, 'C IV', 'E1', '2S-2Po', '1/2-*', '0.00 - 502481.80')],
dtype=[('LAMBDA VAC ANG', '<f8'), ('SPECTRUM', 'S4'), ('TT', 'S2'), ('TERM', 'S6'), ('J J', 'S5'), ('LEVEL ENERGY CM 1', 'S18')])
Reference/API
=============
.. automodapi:: astroquery.atomic
:no-inheritance-diagram:
.. _source: http://www.pa.uky.edu/~peter/atomic/documentation.html
|
