=== The Verdandi spectroscopic database ===

Created by Patrick Eriksson (patrick@rss.chalmers.se)

Present version: Verdandi 2.0 (020814)

Verdandi is published following the philosophy of GNU public
license. This means, for example, that Verdandi is distributed in the
hope that it will be useful, but WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

Special attention shall be given to species with important vibrational
and electronical states. Large efforts have been made to correct the
partition functions used in JPL to give an intensity corresponding to
the total partition sum, but it is not totally clear in all cases what
has been done in JPL. For example, in several cases the relevant 
documentation in JPL is missing. In addition, the search for the 
transition in HITRAN (to get pressure broadening parameters) has not
been developed to perfection. However, in many cases the same values
are used for all transitions of a species and this point is not
important, as long as correct default values for the isotopomer are
given in def4tags.

The compilation of the Verdandi database is described shortly last in
this file. Some further information is found in Section 3.1.3 in the
report "On simulating passive observations of the middle atmosphere in
the range 1-1000 GHz" by Eriksson and Merino (mail
patrick@rss.chalmers.se to obtain a copy).


The present Verdandi version is based on the following data:
---
JPL: Data files downloaded around 2001-04-01. It seems that only MnO
has been added/modified in JPL after this date and this molecule is
not part of Verdandi.

HITRAN: The HITRAN 2000 version is used. Updates done to this HITRAN
version (up to 2002-01-21) seems not to be of importance for Verdandi
(only important for higher frequencies).

Other data: 
1. Pressure broadening data for 4 ozone transitions between 
101 and 111 GHz are take from an article by Connor and Radford 1986.
2. Pressure broadening data for transitions inside the Odin-SMR band
collected by J.M. Colmont (included by Jo Urban).


Main differences between versions:
---
1.3: Bug for pressure shift parameter fixed. 
     The frequency range for the full Verdand database was set to 
     0 - 3000 GHz (some other ranges have been used before).
     However, JPL does not cover all molecules up to 3 THz.
2.0  New species and vibrational states included. Molecule number
     for BrO changed from 38 to 50. Molecule number 1-49 will
     follow HITRAN, while numbers >= 50 are allocated for species
     not included in JPL, but not in HITRAN. See the file
     species.table for details.


Short description of Verdandi:
---
Most of the data are from JPL and HITRAN. JPL is used as primary data
base and only lines from JPL are included. Values differing from
HITRAN and JPL can be included by files with default values for
specific lines. The name of these files is dMO.ISO and are placed in
a specific directory. It is not necessary to create default files
for each isoptope. The data in the default line files must have the
Verdandi format but can include last in each line a code to describe
the information source.

If a line in JPL can not be found in HITRAN or another line with
similar frequency and quantum numbers, some values are taken from a
file with default values for each isotope.

The data is selected in the order.
1. From a default file for each isotop named as dMO.ISO. This file 
gives the possibility to include new laboratory measurements not 
included in JPL and HITRAN.
2. Frequency, frequency uncertainty, intensity, energy of lower state, 
degrees of freedom and rotational quantum numbers are taken from JPL.
3. HITRAN is searched and the quantum numbers are compared to find a 
match. The JPL line is compared to lines in HITRAN with frequencies 
diverging from the JPL frequency with a maximum of HIT_RANGE. If the 
number of lines are big only 2*HIT_NR+1 lines are selected.
4. If no perfect match is found data of the line in HITRAN with closest 
quantum number is selected. The match between the quantum numbers is 
calculated in different ways for the HITRAN quantum groups.
5. If there is no line in HITRAN inside +-HIT_RANGE or all quantum 
numbers are very different, default values of the tag number are used. 
These values are defined in the file DEF_TAG_FILE.

