J/A+A/432/369 Leiden Atomic and Molecular Database (LAMDA) (Schoeier+, 2005)
An atomic and molecular database for analysis of submillimetre line observations
Schoeier F.L., van der Tak, F.F.S., van Dishoeck E.F., Black J.H.
<Astron. Astrophys. 432, 369 (2005)>
=2005A&A...432..369S 2005A&A...432..369S
ADC_Keywords: Atomic physics
Keywords: astronomical databases: miscellaneous - atomic data - molecular data -
radiative transfer - ISM: atoms - ISM: molecules
Abstract:
Atomic and molecular data for the transitions of a number of
astrophysically interesting species are summarized, including energy
levels, statistical weights, Einstein A-coefficients and collisional
rate coefficients. Available collisional data from quantum chemical
calculations and experiments are extrapolated to higher energies (up
to E/k∼1000K). These data, which are made publically available through
the WWW at http://www.strw.leidenuniv.nl/~moldata , are essential
input for non-LTE line radiative transfer programs. An online version
of a computer program for performing statistical equilibrium
calculations is also made available as part of the database.
Comparisons of calculated emission lines using different sets of
collisional rate coefficients are presented. This database should form
an important tool in analyzing observations from current and future
(sub)millimetre and infrared telescopes.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
molecule.dat 94 50 File contents
levels.dat 36 1610 Energy levels
lamda/* . 50 Individual files
--------------------------------------------------------------------------------
Description of file:
Below follows a description of the format adopted for presenting the
atomic and molecular data in LAMDA. Any similarities with datafiles from
other authors is completely coincidental.
% Lines 1-2: molecule (or atom) name
% Lines 3-4: molecular (or atomic) weight (a.m.u.)
% Lines 5-6: number of energy levels (NLEV)
% Lines 7-7+NLEV: level number, level energy (cm-1), statistical weight.
These numbers may be followed by additional info such as the quantum
numbers, which are however not used by the program. The levels must be
listed in order of increasing energy.
% Lines 8+NLEV-9+NLEV: number of radiative transitions (NLIN)
% Lines 10+NLEV-10+NLEV+NLIN: transition number, upper level, lower level,
spontaneous decay rate (s-1). These numbers may be followed by additional
info such as the line frequency, which is however not used by the program.
% Lines 11+NLEV+NLIN-12+NLEV+NLIN: number of collision partners
% Lines 13+NLEV+NLIN-14+NLEV+NLIN: collision partner ID and reference.
Valid identifications are:
1=H2, 2=para-H2, 3=ortho-H2, 4=electrons, 5=H, 6=He.
% Lines 15+NLEV+NLIN-16+NLEV+NLIN: number of transitions for which
collisional data exist (NCOL)
% Lines 17+NLEV+NLIN-18+NLEV+NLIN: number of temperatures for which
collisional data exist
% Lines 19+NLEV+NLIN-20+NLEV+NLIN: values of temperatures for which
collisional data exist
% Lines 21+NLEV+NLIN-21+NLEV+NLIN+NCOL: transition number, upper level,
lower level; rate coefficients (cm3/s) at each temperature. The program
interpolates between rate coefficients in the specified temperature range.
Outside this range, it assumes the collisional de-excitation rate
coefficients are constant with T, i.e., it uses rate coefficients
specified at the highest T (400K in this case)also for higher
temperatures, and similarly at temperatures below the lowest value (10K
in this case) for which rate coefficients were specified.
Example molecular data file: HCO+
!MOLECULE HCO+
!MOLECULAR WEIGHT
29.0
!NUMBER OF ENERGY LEVELS
21
!LEVEL + ENERGIES(cm-1) + WEIGHT + J
1 0.000000000 1.0 0
2 2.975008479 3.0 1
(etc)
21 624.269300464 41.0 20
!NUMBER OF RADIATIVE TRANSITIONS
20
!TRANS + UP + LOW + EINSTEINA(s-1) + FREQ(GHz)
1 2 1 4.251e-05 89.18839570
2 3 2 4.081e-04 178.37481404
(etc)
20 21 20 4.955e-01 1781.13802857
!NUMBER OF COLL PARTNERS
1
!COLLISIONS BETWEEN
1 H2-HCO+ from Flower (1999)
!NUMBER OF COLL TRANS
210
!NUMBER OF COLL TEMPS
12
!COLL TEMPS
10.0 20.0 30.0 50.0 70.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0
!TRANS + UP + LOW + COLLRATES(cm3 s-1)
1 2 1 2.6e-10 2.3e-10 2.1e-10 2.0e-10 1.9e-10 1.8e-10 2.0e-10 2.2e-10
2.3e-10 2.5e-10 2.7e-10 2.8e-10
2 3 1 1.4e-10 1.2e-10 1.1e-10 1.0e-10 9.2e-11 8.8e-11 8.4e-11 8.2e-11
8.1e-11 8.3e-11 8.1e-11 8.5e-11
(etc)
210 21 20 3.7e-10 3.6e-10 3.6e-10 3.5e-10 3.5e-10 3.5e-10 3.8e-10 4.0e-10
4.4e-10 4.7e-10 5.0e-10 5.2e-10
--------------------------------------------------------------------------------
See also:
http://www.strw.leidenuniv.nl/~moldata : LAMDA Home Page
Byte-by-byte Description of file: molecule.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- File File name (see "Description of file" section)
18- 26 A9 --- Mol Molecule designation
28- 31 F4.1 --- MWei Molecular weight
33 A1 --- n_MWei [m] m if Mass instead of Molecular weight
35- 37 I3 --- Nlev Number of computed levels
39- 94 A56 --- n_Mol Note on Mol
--------------------------------------------------------------------------------
Byte-by-byte Description of file: levels.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- File File name (see "Description of file" section)
17- 19 I3 --- Level Level number
23- 32 F10.4 cm-1 E Level energy
34- 36 I3 --- Weight Statistical weight
--------------------------------------------------------------------------------
Acknowledgements: Fredrik Schoier, fredrik(at)astro.su.se
(End) Patricia Vannier [CDS] 23-Feb-2005