Citation: HU Ren-Zhi, XIE Pin-Hua, ZHANG Qun, SI Fu-Qi, CHEN Yang. Temperature Dependence of C₂(a³П_u) Radical Reactions with Sulfur Bearing Molecules[J]. Acta Physico-Chimica Sinica, ;2014, 30(5): 797-802. doi: 10.3866/PKU.WHXB201403072 shu

Temperature Dependence of C₂(a³П_u) Radical Reactions with Sulfur Bearing Molecules

HU Ren-Zhi ^1, ,
XIE Pin-Hua ¹ ,
ZHANG Qun ² ,
SI Fu-Qi ¹ ,
CHEN Yang ^2,

1.
1 Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, Hefei 230031, P. R. China;
2 Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China

Received Date: 31 December 2013
Available Online: 7 March 2014
Fund Project:

The bimolecular rate constants for the gas- phase reactions of C₂(a³П_u) with sulfur-bearing molecules (H₂S, SO₂, CS₂) were measured over the temperature range 298-673 K, by means of pulsed laser photolysis/laser-induced fluorescence technique. The rate constants (cm³·molecule^-1·s^-1) can be fitted by the normal Arrhenius expressions: k(H₂S)=(1.61±0.06)×10^-12exp[-(180.91±15.73)/T], k(SO₂)=(1.26±0.10)×10^-15 exp[(2230.68±27.77)/T], k(CS₂)=(1.17±0.02)×10^-10 exp[(253.31±7.69)/T], where all error estimates are ±2σ and represent the precision of the fit. The observed bimolecular rate constants and positive temperature dependence of k(H₂S) show that the reaction of C₂(a³П_u) with H₂S in the range 298-673 K proceeds via a hydrogen-abstraction mechanism. The bimolecular rate constants for the reaction of C₂(a³П_u) with SO₂ show a strong negative temperature dependence. The high rate constants for the C₂(a³П_u)+CS₂ reaction and negative temperature dependence support an addition mechanism.
- C₂(a³П_u) radical,
- Laser induced fluorescence,
- Rate constant,
- Temperature dependence
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Temperature Dependence of C2(a3Пu) Radical Reactions with Sulfur Bearing Molecules

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Temperature Dependence of C₂(a³П_u) Radical Reactions with Sulfur Bearing Molecules