A vacuum ultraviolet laser pulsed field ionization-photoion study of methane (CH4): Determination of the appearance energy of methylium from methane with unprecedented precision and the resulting impact on the bond dissociation energies of CH4 and CH4+

Chang, Yih -Chung; Xiong, Bo; Bross, David H.; Ruscic, Branko; Ng, C. Y.

doi:10.1039/C6CP08200A

Title: A vacuum ultraviolet laser pulsed field ionization-photoion study of methane (CH₄): Determination of the appearance energy of methylium from methane with unprecedented precision and the resulting impact on the bond dissociation energies of CH₄ and CH₄⁺

Journal Article · Mon Mar 27 00:00:00 EDT 2017 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/C6CP08200A· OSTI ID:1366503

^[1]; Xiong, Bo ^[1]; Bross, David H. ^[2];

^[3];

^[1]

Univ. of California, Davis, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, Chicago, IL (United States)

Here, we report on the successful implementation of a high-resolution vacuum ultraviolet (VUV) laser pulsed field ionization-photoion (PFI-PI) detection method for the study of unimolecular dissociation of quantum-state- or energy-selected molecular ions. As a test case, we have determined the 0 K appearance energy (AE₀) for the formation of methylium, CH₃⁺, from methane, CH₄, as AE₀ (CH₃⁺/CH₄) = 14.32271 ± 0.00013 eV. This value has a significantly smaller error limit, but is otherwise consistent with previous laboratory and/or synchrotron-based studies of this dissociative photoionization onset. Furthermore, the sum of the VUV laser PFI-PI spectra obtained for the parent CH₄⁺ ion and the fragment CH₃⁺ ions of methane is found to agree with the earlier VUV pulsed field ionization-photoelectron (VUV-PFI-PE) spectrum of methane, providing unambiguous validation of the previous interpretation that the sharp VUV-PFI-PE step observed at the AE₀ (CH₃⁺/CH₄) threshold ensues because of higher PFI detection efficiency for fragment CH₃⁺ than for parent CH₄⁺. This, in turn, is a consequence of the underlying high-n Rydberg dissociation mechanism for the dissociative photoionization of CH₄, which was proposed in previous synchrotron-based VUV-PFI-PE and VUV-PFI-PEPICO studies of CH₄. The present highly accurate 0 K dissociative ionization threshold for CH₄ can be utilized to derive accurate values for the bond dissociation energies of methane and methane cation. For methane, the straightforward application of sequential thermochemistry via the positive ion cycle leads to some ambiguity because of two competing VUV-PFI-PE literature values for the ionization energy of methyl radical. The ambiguity is successfully resolved by applying the Active Thermochemical Tables (ATcT) approach, resulting in D₀ (H-CH₃) = 432.463 ± 0.027 kJ/mol and D₀(H-CH₃⁺) = 164.701 ± 0.038 kJ/mol.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1366503

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Vol. 19, Issue 14; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
active thermochemical tables
dissociative ionization
photoionization
thermochemistry

Title: A vacuum ultraviolet laser pulsed field ionization-photoion study of methane (CH4): Determination of the appearance energy of methylium from methane with unprecedented precision and the resulting impact on the bond dissociation energies of CH4 and CH4+

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Title: A vacuum ultraviolet laser pulsed field ionization-photoion study of methane (CH₄): Determination of the appearance energy of methylium from methane with unprecedented precision and the resulting impact on the bond dissociation energies of CH₄ and CH₄⁺