EDP Sciences logo
Subscriber Authentication Point
Search
Menu
Home All issues Volume 562 (February 2014) A&A, 562 (2014) A83 Full HTML
Free Access

Table B.2

New dissociative recombination (DR) reaction rates and branching ratios.

Chemical reactionsa α β γ k b References NSBR c
  cm3   s-1   cm3   s-1
DR of H
H(o) e− → H2(o) H 2.51(−8) 0.16 −1.01 1.61(−8) 1,2 1
H(o) e− → H H H 4.87(−8) 0.16 −1.01 3.13(−8) 1,2
H(p) e− → H2(o) H 0.92(−8) −0.73 0.98 9.94(−8) 1,2 1/2
H(p) e− → H2(p) H 0.92(−8) −0.73 0.98 9.94(−8) 1,2 1/2
H(p) e− → H H H 3.56(−8) −0.73 0.98 3.86(−7) 1,2
DR of nitrogen hydrides
N2H+ e− → N2 H 2.77(−7) −0.50 0.00 3.43(−6) 3
N2H+ e− → NH N 2.09(−8) −0.50 0.00 2.59(−7) 3
NH(o) e− → NH H 1.17(−7) −0.50 0.00 6.41(−7) 4,5
NH(p) e− → NH H 1.17(−7) −0.50 0.00 6.41(−7) 4,5
NH(o) e− → N H H 1.71(−7) −0.50 0.00 9.37(−7) 4,5
NH(p) e− → N H H 1.71(−7) −0.50 0.00 9.37(−7) 4,5
NH(o) e− → N H2(o) 1.20(−8) −0.50 0.00 6.57(−8) 4,5
NH(p) e− → N H2(p) 1.20(−8) −0.50 0.00 6.57(−8) 4,5
NH(p) e− → NH2(p) H 7.75(−8) −0.50 0.00 4.25(−7) 6 1/2
NH(p) e− → NH2(o) H 7.75(−8) −0.50 0.00 4.25(−7) 6 1/2
NH(o) e− → NH2(o) H 1.55(−7) −0.50 0.00 8.49(−7) 6 1
NH(p) e− → NH H H 1.55(−7) −0.50 0.00 8.49(−7) 6
NH(o) e− → NH H H 1.55(−7) −0.50 0.00 8.49(−7) 6
NH (I = 2) e− → NH2(o) H H 1.22(−7) −0.60 0.00 9.39(−7) 7 1
NH (I = 1) e− → NH2(o) H H 8.07(−8) −0.60 0.00 6.21(−7) 7 2/3
NH (I = 1) e− → NH2(p) H H 4.03(−8) −0.60 0.00 3.10(−7) 7 1/3
NH (I = 0) e− → NH2(o) H H 6.11(−8) −0.60 0.00 4.70(−7) 7 1/2
NH (I = 0) e− → NH2(p) H H 6.11(−8) −0.60 0.00 4.70(−7) 7 1/2
NH (I = 2) e− → NH2(o) H2(o) 1.88(−8) −0.60 0.00 1.45(−7) 7 1
NH (I = 1) e− → NH2(o) H2(o) 6.27(−9) −0.60 0.00 4.83(−8) 7 1/3
NH (I = 1) e− → NH2(o) H2(p) 6.27(−9) −0.60 0.00 4.83(−8) 7 1/3
NH (I = 1) e− → NH2(p) H2(o) 6.27(−9) −0.60 0.00 4.83(−8) 7 1/3
NH (I = 0) e− → NH2(o) H2(o) 9.40(−9) −0.60 0.00 7.23(−8) 7 1/2
NH (I = 0) e− → NH2(p) H2(p) 9.40(−9) −0.60 0.00 7.23(−8) 7 1/2
NH (I = 2) e− → NH3(o) H 8.00(−7) −0.60 0.00 6.16(−6) 7 1
NH (I = 1) e− → NH3(o) H 2.66(−7) −0.60 0.00 2.05(−6) 7 1/3
NH (I = 1) e− → NH3(p) H 5.33(−7) −0.60 0.00 4.10(−6) 7 2/3
NH (I = 0) e− → NH3(p) H 8.00(−7) −0.60 0.00 6.16(−6) 7 1
DR of H3O+
H3O+ e− → OH H2(o) 3.00(−8) −0.50 0.00 1.64(−7) 6 1/2
H3O+ e− → OH H2(p) 3.00(−8) −0.50 0.00 1.64(−7) 6 1/2
H3O+ e− → OH H H 2.60(−7) −0.50 0.00 1.42(−6) 6
H3O+ e− → H2O H 1.10(−7) −0.50 0.00 6.03(−7) 6
H3O+ e− → H2(o) H O 2.80(−9) −0.50 0.00 1.53(−8) 6 1/2
H3O+ e− → H2(p) H O 2.80(−9) −0.50 0.00 1.53(−8) 6 1/2

Notes. Numbers in parentheses are power of 10.

(a)

o and p stand for ortho and para states respectively. As a spherical top with four identical protons, the ammonium ion exists in three nuclear spin states noted as in Faure et al. (2013): para (I = 0), meta (I = 2), and ortho (I = 1). We note that the meta and ortho species are inverted in Rist et al. (2013).

(b)

Rates k = α   (T/300)β   exp( − γ/T) have been computed for a 10 K temperature.

(c)

NSBR stands for nuclear-spin branching ratio. These were combined with the overall rate coefficients taken from the cited references, e.g. Dos Santos et al. (2007).

Reference. (1) Dos Santos et al. (2007); (2) McCall et al. (2004); (3) Vigren et al. (2012); (4) Mitchell (1990); (5) Thomas et al. (2005); (6) Jensen et al. (2000); (7) Öjekull et al. (2004).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.