From d1a05bc4a63cb5dfdc16084f31cca50260259be6 Mon Sep 17 00:00:00 2001
From: richard <richard@aaf1aab0-4228-0410-ad68-8dceda47f409>
Date: Wed, 14 Aug 2013 12:26:55 +0000
Subject: [PATCH] Added a README to the Zeeman constants by Jana's request.
git-svn-id: https://radiativetransfer.org/svn/rt/arts-xml-data/trunk@8587 aaf1aab0-4228-0410-ad68-8dceda47f409
---
ChangeLog | 6 ++++
spectroscopy/QuantumConstants/README | 35 +++++++++++++++++++
...eman_constant.xml => zeeman_constants.xml} | 0
3 files changed, 41 insertions(+)
create mode 100644 spectroscopy/QuantumConstants/README
rename spectroscopy/QuantumConstants/{zeeman_constant.xml => zeeman_constants.xml} (100%)
diff --git a/ChangeLog b/ChangeLog
index b8b7ac02..e5c6d8db 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2013-08-14 Richard Larsson <ric.larsson@gmail.com>
+
+ * ARTS-XML-DATA-2-1-55
+
+ * spectroscopy/QuantumConstants/README: Now explains the other file.
+
2013-08-14 Richard Larsson <ric.larsson@gmail.com>
* ARTS-XML-DATA-2-1-54
diff --git a/spectroscopy/QuantumConstants/README b/spectroscopy/QuantumConstants/README
new file mode 100644
index 00000000..19ca9a7a
--- /dev/null
+++ b/spectroscopy/QuantumConstants/README
@@ -0,0 +1,35 @@
+Format of zeeman_constants.xml:
+
+@ Isotope GS Spin Hund_case
+
+where GS is a constant for the molecule that calculates the effective g-value,
+Spin is a molecular constant, and Hund_case tells the program to estimate the
+calculations with a specific Hund case.
+
+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".
+
+GS = 2.0023193043622 means that the electron is free, and is used when we had no
+data for GS, but rather just guessed.
+
+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.
diff --git a/spectroscopy/QuantumConstants/zeeman_constant.xml b/spectroscopy/QuantumConstants/zeeman_constants.xml
similarity index 100%
rename from spectroscopy/QuantumConstants/zeeman_constant.xml
rename to spectroscopy/QuantumConstants/zeeman_constants.xml
--
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