Added known emission line widths (#58)

CHANGELOG.rst

@@ -8,6 +8,10 @@ We follow `semantic versioning <https://semver.org>`_ practices so versions incr
 
 Note that PATCH versions releases may not be documented below.
 
+2.3.0 (2024-10-14)
+------------------
+* Added line widths to the emission line list
+
 2.2.0 (2024-03-14)
 ------------------
 * Fix and improvement to gui

roentgen/__init__.py

@@ -4,7 +4,7 @@
 photons with matter (x-rays and gamma-rays).
 """
 import os
-from importlib.metadata import version, PackageNotFoundError
+from importlib.metadata import PackageNotFoundError, version
 
 import astropy.units as u
 from astropy.io import ascii

roentgen/data/README.rst

@@ -39,10 +39,12 @@ Energy ranges from 1 keV to 20 MeV.
 emission_lines.csv
 ------------------
 Source: `CXRO X-ray data Booklet Table 1-3 <https://xdb.lbl.gov/Section1/Table_1-3.pdf>`__
+Source: `AXAF Project Science: Widths for Characteristic X-Ray Lines <https://wwwastro.msfc.nasa.gov/xraycal/linewidths.html>`__
 
 - **energy**: Energy of emission line in eV
 - **transition**: Name of the transition in Siegbahn notation
 - **intensity**: Relative intensity of the line
+- **width**: Line width in eV
 
 emission_energies.csv
 ---------------------