Rate Coefficients for the H + NH₃ Reaction over a Wide Temperature Range

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Article on rate coefficients for the hydrogen atom + ammonia reaction over a wide temperature range.

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4 p.

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Ko, Taecho; Marshall, Paul & Fontijn, A. (Arthur) February 1, 1990.

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Article on rate coefficients for the hydrogen atom + ammonia reaction over a wide temperature range.

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4 p.

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Abstract: The temperature dependence of the rate coefficients for the H + NH₃ → NH₂ + H₂ reaction is measured by the high-temperature photochemistry (HTP) technique. Technique improvements are discussed. For the 490-960 K range, we find k₁(T) = 1.21 x 10⁻¹⁰ exp(-6920 K/T) cm³ molecule⁻¹ s⁻¹. When combined with two other sets of direct measurements, a best fit gives k₁(T) = 9.0 x 10⁻¹⁹ (T/K)(2.40) exp(-4991 K/T) cm³ molecule⁻¹ s⁻¹ for the 490-1780 K range. It is shown that these data can be more closely fitted by a calculation based on conventional transition-state theory plus an Eckart tunneling model than with other current transition-state models considered. Using the potential energy surface for the H + NH₃ reaction, several tunneling models fit the results for the D + ND₃ reaction. The kinetic isotope effect for these two reactions is compared to results from different theoretical models, with the Eckart model giving the best approximation.

Reprinted with permission from the Journal of Physical Chemistry. Copyright 1990 American Chemical Society.

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  • Journal of Physical Chemistry, 1990, Washington D.C.: American Chemical Society, pp. 1401-1404

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Publication Information

  • Publication Title: Journal of Physical Chemistry
  • Volume: 94
  • Issue: 4
  • Page Start: 1401
  • Page End: 1404
  • Pages: 4
  • Peer Reviewed: Yes

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  • January 24, 1989

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  • August 8, 1989

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  • February 1, 1990

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  • April 25, 2015, 8:59 p.m.

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Ko, Taecho; Marshall, Paul & Fontijn, A. (Arthur). Rate Coefficients for the H + NH₃ Reaction over a Wide Temperature Range, article, February 1, 1990; [Washington, D.C.]. (digital.library.unt.edu/ark:/67531/metadc503262/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.