* ARTS-XML-DATA-2-3-24

If you update this, also update ARTS to the latest version.
Updating only this will otherwise break the tests in ARTS.

* spectroscopy/QuantumConstants/*: removed for it was bad.
With the new HITRAN database it is possible to read all values
from file (it was possible before but their documentation was
too difficult to understand.)

* spectroscopy/Perrin/O2.xml.gz:  Changed by adding the quantum
numbers required to compute the Zeeman effect.  Note that
reading HITRAN with the update I am soonish committing
will have the same effect



git-svn-id: https://radiativetransfer.org/svn/rt/arts-xml-data/trunk@10905 aaf1aab0-4228-0410-ad68-8dceda47f409

ChangeLog

+2017-03-01 Richard Larsson <ric.larsson@gmail.com>
+
+	* ARTS-XML-DATA-2-3-24
+	
+	If you update this, also update ARTS to the latest version.
+	Updating only this will otherwise break the tests in ARTS.
+	
+	* spectroscopy/QuantumConstants/*: removed for it was bad.
+	With the new HITRAN database it is possible to read all values
+	from file (it was possible before but their documentation was
+	too difficult to understand.)
+	
+	* spectroscopy/Perrin/O2.xml.gz:  Changed by adding the quantum
+	numbers required to compute the Zeeman effect.  Note that
+	reading HITRAN with the update I am soonish committing
+	will have the same effect
+
 2017-02-20 Jana Mendrok <jana.mendrok@chalmers.se>
 
 	* ARTS-XML-DATA-2-3-23

spectroscopy/QuantumConstants/README

-Format of zeeman_constants.xml:
-
-@ Isotope GS Lambda Spin Hund_case
-
-where GS is a constant for the molecule that calculates the effective g-value,
-Lambda is the ground state number,  Spin is the spin, and Hund_case tells the
-program to estimate the calculations with a specific Hund case.
-Note, for example, that O2 ground state is Sigma_3, so Lambda is 0 and S is 1, NO ground
-state is Pi_2 so Lambda is 1 and S is 1/2.
-
-The Zeeman split is calculated with changes in energy levels. Essentially, 
-dE = g M C_Z,
-where 
-g = GS/2 * g_H,
-and g_H is a function of the quantum numbers for a certain transition and 
-certain Hund case, M is the quantum number projection of the total angular 
-momentum on the magnetic field, and C_Z is a function of physical constants and
-the magnetic field.
-
-The change in frequency is then calculated from 
-df = dE'-dE'',
-where the primes tells you that the quantum numbers are before and after the 
-transition.
-
-Hund case a is number "0", and 
-Hund case b is number "1".
-
-Assuming the electron is free, then GS = 2.0023193043622.
-We used this assumption when we had no other data for GS. However, we do not
-know how well this assumption holds for the respective molecules. Currently,
-this regards NO2 and HO2, though these are only included for reference and will
-not run.
-
-The GS values for O2, NO, OH, ClO, and SO are from 
-
-H. Christensen, and L. Veseth, On the High-Precision Zeeman Effect in 02 and SO.
-Journal of Molecular Spectroscopy 72, 438-444, 1978.
-
-L. Veseth, Relativistic Corrections to the Zeeman Effect in Diatomic Molecules.
-Journal of Molecular Spectroscopy 66, 259-271, 1977.
-

spectroscopy/QuantumConstants/zeeman_constants.xml

-<?xml version="1.0"?>
-<arts format="ascii" version="1">
-<SpeciesAuxData version="1" nelem="16" nparam="4">
-@ O2-66 2.002064 0 1 1
-@ O2-68 2.002064 0 1 1
-@ O2-67 2.002064 0 1 1
-@ NO-46 2.00071 1 0.5 0
-@ NO-56 2.00071 1 0.5 0
-@ NO-48 2.00071 1 0.5 0
-@ OH-61 2.00089 1 0.5 0
-@ OH-81 2.00089 1 0.5 0
-@ OH-62 2.00089 1 0.5 0
-@ ClO-56 2.00072 1 0.5 0
-@ ClO-76 2.00072 1 0.5 0
-@ SO-26 2.002106 0 1 1
-@ SO-46 2.002106 0 1 1
-@ SO-28 2.002106 0 1 1
-@ NO2-646 2.0023193043622 -1 0.5 1
-@ HO2-166 2.0023193043622 -1 0.5 1
-</SpeciesAuxData>
-</arts>