HITRAN Queries (astroquery.hitran)¶
Getting started¶
This module provides an interface to the high-resolution transmission molecular
absorption database API (HITRAN). The current version of the database
contains a compilation of spectroscopic parameters for 49 molecular species
along with their most significant isotopologues. Using the hitran module you
can search transitions for a particular molecule in a given wavenumber range.
Examples¶
This will download all transitions of the main isotopologue of water between
the wavenumbers of 3400 and 4100 cm-1. The expected type for the
parameters min_frequency and max_frequency is an AstroPy quantity.
The data are returned as an Table instance.
>>> from astropy import units as u
>>> from astroquery.hitran import Hitran
>>> tbl = Hitran.query_lines(molecule_number=1,
... isotopologue_number=1,
... min_frequency=0. / u.cm,
... max_frequency=10. / u.cm)
>>> tbl
<Table length=29>
molec_id local_iso_id nu sw ... line_mixing_flag gp gpp
int32 int32 float32 float32 ... bytes1 float32 float32
-------- ------------ -------- --------- ... ---------------- ------- -------
1 1 0.072049 1.875e-30 ... 9.0 11.0
1 1 0.400571 2.528e-28 ... 27.0 21.0
1 1 0.741682 4.451e-25 ... 39.0 33.0
... ... ... ... ... ... ... ...
1 1 9.640401 1.593e-34 ... 129.0 123.0
1 1 9.795592 1.794e-27 ... 39.0 45.0
1 1 9.834255 1.969e-35 ... 135.0 141.0
1 1 9.921502 6.136e-28 ... 13.0 15.0
Troubleshooting¶
If you are repeatedly getting failed queries, or bad/out-of-date results, try clearing your cache:
>>> from astroquery.hitran import Hitran
>>> Hitran.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¶
astroquery.hitran Package¶
HITRAN Catalog Query Tool¶
- Author:
Adam Ginsburg (adam.g.ginsburg@gmail.com)
Classes¶
|
Initialize a Hitran query class. |