==========================================================================
VI/144 Nebular [OIII] collision strengths - SS3 (Storey+, 2015)
The following files can be converted to FITS (extension .fit or fit.gz)
levels.dat files/*
==========================================================================
Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=VI/144
==========================================================================
drwxr-xr-x 141 cats archive 4096 Sep 6 2023 [Up]
drwxr-xr-x 5 cats archive 243 Jan 12 2023 [TAR file]
-rw-r--r-- 1 cats archive 469 Dec 19 2022 .message
-r--r--r-- 1 cats archive 20925 Aug 10 2015 ReadMe
drwxr-xr-x 2 cats archive 4096 Mar 4 2015 files
-r--r--r-- 1 cats archive 426 Aug 10 2015 levels.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe :VI/144 Nebular [OIII] collision strengths - SS3 (Storey+, 2015)
================================================================================
Effective collision strengths for excitation and de-excitation of nebular [OIII]
optical and infrared lines with kappa distributed electron energies.
Storey P.J., Sochi T.
<Mon. Not. R. Astron. Soc. 449, 2974 (2015)>
=2015MNRAS.449.2974S
=2015yCat.6144....0S
================================================================================
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes - radiation mechanisms: non-thermal -
planetary nebulae: general - infrared: general
Abstract:
The list consists of effective collision strengths in the electron
excitation (Upsilon) and de-excitation (Downsilon) with a kappa
electron energy distribution as a function of the electron temperature
and kappa for 10 forbidden transitions between the five lowest energy
levels of the astronomically abundant doubly-ionized oxygen ion,
O^2+^, in an intermediate coupling scheme using the Breit-Pauli
relativistic terms as implemented in an R-matrix atomic scattering
code (Berrington et al., 1995). An atomic target for the R-matrix
scattering defined by 72 atomic terms is used in these calculations
with Gailitis averaging in the region beneath thresholds where the
effective quantum number is greater than 10. The raw collision
strength data are obtained from a list created previously by the
authors (Storey et al., 2014MNRAS.441.3028S, Cat. VI/141). The limits
of the effective collision strength data are the same as the limits of
the original raw collision strength data, that is the data apply for a
temperature range between about 100-25000K with a free electron
excitation energy up to about 1.3 Rydberg. These limits are adopted
mainly for relevance to planetary nebulae and HII regions.
Description:
The data set consists of ten Upsilon files labeled 'up_mn.dat' and ten
Downsilon files labeled 'do_mn.dat' where m=1,2,3,4 and n=2,3,4,5 with
m<n. The indices m and n refer respectively to the lower and upper
level index as given in the table below. The Upsilon data are scaled
by a multiplicative factor of exp(-dEij/(kT)) where dEij is the energy
gap between the lower and upper levels while k and T are the Boltzmann
constant and electron temperature respectively. In each one of the
Upsilon and Downsilon files, the 10-based logarithm of the effective
collision strengths are tabulated in a rectangular array where the
columns represent 10-based logarithm of electron temperature:
logT=2.0(0.025)4.3, while the rows represent kappa: (1K)
kappa=1.600(0.025)1.975, 2.0(0.1)2.9, 3.0(0.2)4.8, 5.0(0.5)9.5,
10(1)19, 20(2.5)47.5, 50(5)95, 100(25)175, 200(50)450, 500(100)900,
1000(1000)5000, 10000, 50000, 100000 and 1000000. Some values of the
logarithmic scaled Upsilon are replaced by the '99999999' marker
because they fall below certain limits and hence they are practically
useless. More details about these issues and any other issue can be
found in the associated paper (see above).