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Table 1. Spectroscopic Database for the Simulation of the EXOMARS Radiative Field
species
system
upper state –
lower state
bands
0
00
(vmax
, vmax
)
species
database
Martian-like molecular systems
CO
CO2
1
+
1
+
X Σ −X Σ
A1 Π−X 1 Σ+
b3 Σ+ −a3 Π
B 1 Σ+ −A1 Π
d3 Π−a3 Π
a03 Π−a3 Π
(10; 10)
(10; 10)
(2; 10)
(2; 10)
(10; 10)
(10; 10)
–
–
613 bands
Topbase (Topbase)
Topbase (Topbase)
C
O
O2
Schumann-Runge
B
–
–
–
O2
CO
CO2
C
O
361
245
total Qa
total Qa
total Qa
–
–
–
molecular photodissociation
(10; 10)
–
O2
Atomic lines
species
level Qa
level Qa
molecular photoionization
Earth-like molecular systems
3 −
Σ−
u −X Σg
electronic
levels
atomic photoionization
X-X
Fourth-Positive
Third-Positive
Angstrom
Triplet
Asundi
3
model
T-dependent Qa
–
atomic photodetachment
database
model
electronic
levels
NIST (NIST)
NIST (NIST)
–
–
272
377
−
–
–
C
O−
ing over 90% of the calculation time. It is therefore necessary to preallocate the different radiative data using a
stack system. For such a purpose, a 28GB ramdrive has
been implemented in the machine.
total Qa
total Qa
–
–
0
10
Strong
Weak
Very Weak
−1
10
−2
10
−3
Intensity (A. U.)
10
−4
10
−5
10
−6
10
−7
10
−8
10
−9
10
Figure 7. Multicore machine for radiative transfer calculations.
3. CONVERGENCE STUDIES
2.48
2.485
2.49
2.495
2.5
2.505
Wavelength (A)
2.51
2.515
2.52
4
x 10
Figure 8. Example of Strong, Weak, and Very weak lines
talling 4 different sets of parameters. these are detailed in
Tab.
Table 2. Spectral grid parameters
As discussed in (Lino da Silva 2007), the lineshape routine of the SPARTAN code is fully parametrical in the
sense that it allows the user to select the accuracy of
the calculated lineshapes, as well as the number of lines
to be calculated explicitly and the lines to be added as
a pseudo-continuum. Two sets of thresholds separate
strong, weak and very weak lines. Strong lines are then
calculated as a Voigt profile, Weak lines (W) are calculated as a Voigt profile if they are not covered by a strong
line, and finally Very Weak (VW) lines always added
as a pseudo-continuum. An illustration of this energyconservative scheme is presented in Fig. 8
The obtained spectral fluxes are presented in Fig. 9 for
run 1
These two parameters have been tested for grid convergence investigations. The two sets of different lineshape
and pseudo-continuum parameters have been tested, to-
We verify that wall fluxes issued from IR transitions
(>10,0000Å) are predominant, due to CO2 radiation with
a smaller contribution from CO IR radiation. In the VUV-
(c,w):(13,25)
(c,w):( 7,14)
(W,VW):
(10−3 ,10−6 )
(W,VW):
(10−2 ,10−4 )
run 1
run 3
run 2
run 4
c: line center points; w: line wings points;
W: Weak lines threshold;
VW: Very Weak lines threshold;