J/ApJ/737/44 Deuterated chemistry of the early universe (Gay+, 2011)
The highly deuterated chemistry of the early universe.
Gay C.D., Stancil P.C., Lepp S., Dalgarno A.
<Astrophys. J., 737, 44 (2011)>
=2011ApJ...737...44G 2011ApJ...737...44G
ADC_Keywords: Atomic physics
Keywords: early universe - molecular data - molecular processes -
nuclear reactions, nucleosynthesis, abundances
Abstract:
A comprehensive chemistry of the highly deuterated species D2,
D+2, D2H+, and D+3 in the early universe is presented.
Fractional abundances for each are calculated as a function of
redshift z in the recombination era. The abundances of the
isotopologues are found to display similar behavior. Fractionation
enhances the abundances of most of the more highly deuterated species
as the redshift decreases due to the closing of some reaction channels
as the gas temperature cools. Rate coefficients for the majority of
the reactions involving the deuterated species are uncertain resulting
in a corresponding uncertainty in their predicted abundances.
Description:
Here we expand upon the network developed by Stancil et al.
(1998ApJ...509....1S 1998ApJ...509....1S) and Lepp et al. (2002JPhB...35R..57L 2002JPhB...35R..57L) which
contained 146 reactions by adding a comprehensive set of reactions for
D2, D+2, D2H+, and D+3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 257 Reaction rate coefficients
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See also:
J/A+A/547/A33 : Chemical reactions for a deuteration network (Vastel+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- ID Identification of the reaction
5- 8 A4 --- R1 Reactant 1
10- 15 A6 --- R2 Reactant 2
17- 20 A4 --- P1 Product 1
22- 27 A6 --- P2 Product 2
29- 34 A6 --- P3 Product 3
36- 44 E9.2 cm3/s a1 ? Fitting Coefficient (1)
46- 54 E9.2 --- a2 ? Fitting Coefficient (1)
56- 64 E9.2 K a3 ? Fitting Coefficient (1)
66 A1 --- Note [abe] Footnotes (2)
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Note (1): The exoergic form of the equation for the rate coefficient is
α=a1*(T/300)(a2)*exp(-T/a3) and the endoergic form is
α=a1*(T/300)(a2)*exp(-a3/T), where α is the rate
coefficient and T is the matter temperature.
Note (2): All reactions use the exoergic form for the rate coefficient except
those marked (a) which use the endoergic form. Reactions marked (b)
are photodestruction processes determined by detailed balance from the
reverse processes. Reactions marked (c) are stimulated emission.
Reactions marked (d) required six coefficients. Reaction marked (e)
is a photodestruction process due to distortion photons.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Jan-2013