Titans atmosphere: possible clustering reactions ofHCNH+, HCNH+(N2) and HCNH+(CH4) ions withacetylene
The thermochemistry of several ion-molecule clustering reactions of HCNH +, HCNH +(N 2) and HCNH +(CH 4) ions with C 2H 2 was determined from chemical equilibrium measurements. Inorder to better understand the chemistry of Titan, a gas mixture containing 97% N 2, 3% CH 4 anda small amount of 0.005%...
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Published in: | Planetary and space science Vol. 47; no. 1; pp. 151 - 162 |
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Main Authors: | , , |
Format: | Journal Article |
Language: | English |
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01-12-1998
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Abstract | The thermochemistry of several ion-molecule clustering reactions of HCNH
+, HCNH
+(N
2) and HCNH
+(CH
4) ions with C
2H
2 was determined from chemical equilibrium measurements. Inorder to better understand the chemistry of Titan, a gas mixture containing 97% N
2, 3% CH
4 anda small amount of 0.005% C
2H
2 was irradiated by
α-particles in the temperature range 140–320 K and analysed by high-pressure mass spectrometry. The enthalpy and entropy changes for thereactions HCNH
+(C
2H
2)
n
+C
2H
2+N
2←→HCNH
+(C
2H
2)
n
+1
+N
2 (
n=0–2), HCNH
+(C
2H
2)
n
+N
2+N
2←→HCNH
+(C
2H
2)
n
(N
2)+N
2 (
n=1, 2), HCNH
+(C
2H
2)
n
+CH
4+N
2←→HCNH
+(C
2H
2)
n
(CH
4)+N
2 (
n=1, 2), HCNH
+(C
2H
2)
n
(N
2)+C
2H
2+N
2←→HCNH
+(C
2H
2)
n
+1
(N
2)+N
2 (
n=0, 1) have been determined. For the HCNH
+(C
2H
2)
n
series,the absolute enthalpy change decreases monotonically from 12.1 to 2.8 kcal mol
−1 for
n=1 to 3,showing no noticeable effect concerning the filling of shells. The nature of the bonding remainsmainly electrostatic. For the HCNH
+(C
2H
2)
n
(X) series with X=N
2 or CH
4, the free energychanges Δ
G° were calculated for
T=90 K and 165 K. For both temperatures, Δ
G°≈0 forreplacement of N
2 by CH
4 for
n=0 to 2 wheareas Δ
G° for the substitution of N
2 or CH
4 by C
2H
2are negative for
n=0, 1. The ligand-exchange reaction leading to the formation of HCNH
+(C
2H
2)and HCNH
+(C
2H
2)
2 could exist in the lower Titans atmosphere. Paths involving HCNH
+(C
2H
2)(N
2) or HCNH
+(C
2H
2)(CH
4) and yielding to HCNH
+(C
2H
2)
2 ions could also be possible and thuscould lead to heavier organic-nitrogen compounds and eventually large aerosols. |
---|---|
AbstractList | The thermochemistry of several ion-molecule clustering reactions of HCNH
+, HCNH
+(N
2) and HCNH
+(CH
4) ions with C
2H
2 was determined from chemical equilibrium measurements. Inorder to better understand the chemistry of Titan, a gas mixture containing 97% N
2, 3% CH
4 anda small amount of 0.005% C
2H
2 was irradiated by
α-particles in the temperature range 140–320 K and analysed by high-pressure mass spectrometry. The enthalpy and entropy changes for thereactions HCNH
+(C
2H
2)
n
+C
2H
2+N
2←→HCNH
+(C
2H
2)
n
+1
+N
2 (
n=0–2), HCNH
+(C
2H
2)
n
+N
2+N
2←→HCNH
+(C
2H
2)
n
(N
2)+N
2 (
n=1, 2), HCNH
+(C
2H
2)
n
+CH
4+N
2←→HCNH
+(C
2H
2)
n
(CH
4)+N
2 (
n=1, 2), HCNH
+(C
2H
2)
n
(N
2)+C
2H
2+N
2←→HCNH
+(C
2H
2)
n
+1
(N
2)+N
2 (
n=0, 1) have been determined. For the HCNH
+(C
2H
2)
n
series,the absolute enthalpy change decreases monotonically from 12.1 to 2.8 kcal mol
−1 for
n=1 to 3,showing no noticeable effect concerning the filling of shells. The nature of the bonding remainsmainly electrostatic. For the HCNH
+(C
2H
2)
n
(X) series with X=N
2 or CH
4, the free energychanges Δ
G° were calculated for
T=90 K and 165 K. For both temperatures, Δ
G°≈0 forreplacement of N
2 by CH
4 for
n=0 to 2 wheareas Δ
G° for the substitution of N
2 or CH
4 by C
2H
2are negative for
n=0, 1. The ligand-exchange reaction leading to the formation of HCNH
+(C
2H
2)and HCNH
+(C
2H
2)
2 could exist in the lower Titans atmosphere. Paths involving HCNH
+(C
2H
2)(N
2) or HCNH
+(C
2H
2)(CH
4) and yielding to HCNH
+(C
2H
2)
2 ions could also be possible and thuscould lead to heavier organic-nitrogen compounds and eventually large aerosols. |
Author | Duc, E.Le Vacher, J.R. Fitaire, M. |
Author_xml | – sequence: 1 givenname: J.R. surname: Vacher fullname: Vacher, J.R. organization: Laboratoire de Physique des Gaz et des Plasmas, (associated to C. N.R. S.), Bât. 210, Université Paris XI, 91405 Orsay Cedex, France – sequence: 2 givenname: E.Le surname: Duc fullname: Duc, E.Le organization: Laboratoire de Physique des Gaz et des Plasmas, (associated to C. N.R. S.), Bât. 210, Université Paris XI, 91405 Orsay Cedex, France – sequence: 3 givenname: M. surname: Fitaire fullname: Fitaire, M. organization: Laboratoire de Physique des Gaz et des Plasmas, (associated to C. N.R. S.), Bât. 210, Université Paris XI, 91405 Orsay Cedex, France |
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Snippet | The thermochemistry of several ion-molecule clustering reactions of HCNH
+, HCNH
+(N
2) and HCNH
+(CH
4) ions with C
2H
2 was determined from chemical... |
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Title | Titans atmosphere: possible clustering reactions ofHCNH+, HCNH+(N2) and HCNH+(CH4) ions withacetylene |
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