Physics – Atomic Physics
Scientific paper
Jan 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ycat.6119....0b&link_type=abstract
VizieR On-line Data Catalog: VI/119. Originally published in: 2006MNRAS.368.1087B
Physics
Atomic Physics
5
Atomic Physics
Scientific paper
The data are in two parts. The first, the 'Levels File' (levels.dat) is a list of 221,097 energy levels, ordered by J and symmetry block. About 25,000 of these energy levels have been labelled with the appropriate angular momentum (J,Ka,Kc) and vibrational (v1,v2,v3) quantum numbers. The second part of BT2 is the 'Transitions File'. This has 505,806,202 entries. Each transition references upper and lower energy levels in the Levels File and gives the Einstein Aif coefficient for the transition. In uncompressed form the BT2 Transitions File is 12.6Gb of data. Therefore, in order to facilitate use of the list, the transitions have been ordered by frequency and separated into 16 smaller files, each representing a specific frequency range. These have labels of the form 02750-03500-BT2.txt where the two five digit numbers represent the lower and upper ends of the frequency range for that particular file. These files are zipped and need to be unzipped using the command 'bunzip2 filename'.
In addition to the files containing the actual line list, we have provided a Fortran program, spectra-BT2.f90 that, when compiled on the user's computer, will produce an executable file. This will enable the user to generate emission or absorption spectra from BT2 by specifying various parameters including: temperature, frequency range, cut-off intensity and line width. There is also the facility to generate spectra with full ro-vibrational assignments if required. The method of using spectra-BT2 is detailed in the 'readme-spectra' file and there are also examples of a job file and an output file. It is ESSENTIAL to rename or else set up a symbolic link to the Levels File as: 'fort.80'. Also, spectra-BT2.f90 expects a single input transitions file, so if the frequency range required spans more than one of the frequency-ordered files, these must be concatenated to form a single file. In any event, it is ESSENTIAL to rename or else set up a symbolic link to the file containing the transitions as: 'fort.13'
(20 data files).
Barber Robert J.
Harris Gregory J.
Tennyson Jonathan
Tolchenov R. N.
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