Modeling the chemical evolution of a collapsing prestellar core in two spatial dimensions

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Table 1:

The initial abundances.
Species	Abundance^a
	(relative to the number of hydrogen nuclei)
H	0.0
H₂	0.5
He	9.75(-2)
O	1.80(-4)
C⁺	7.86(-5)
N	2.47(-5)
Mg⁺	1.09(-8)
Na⁺	2.25(-9)
Fe⁺	2.74(-9)
S⁺	9.14(-8)
Cl⁺	1.00(-9)
P⁺	2.16(-10)
F	2.00(-10)
Si⁺	9.74(-9)
e^-	7.87(-5)
Grains	1.33(-12)

^a Abundances are given as $a(b) = a \times 10^{b}$ .
The initial abundances, most of them were taken from Aikawa et al. (2001), the grain abundance was taken from Hasegawa et al. (1992). For the fluorine abundance we take a fifth of chlorine abundance (Ziurys et al. 1994).

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