Mass-spectrometric study of the photoionization of methane

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Abstract

Photoionization efficiency curves for the parent and fragment ions of CH4 have been measured with photon band-widths of 1.6 and 0.4 A. For the fragment ions, the effect of thermal rotational energy at room temperature is apparent in the threshold region and was taken into account to obtain accurate thresholds. The bond energy Z?°0(CHr-H) was determined to be 4.477±0.005 eV and the limit AH°/o(CH2) <4.10 eV was found. Ion-pair formation yielding CHi+ and H- was found to occur with low probability.

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Chupka, W. A. (1968). Mass-spectrometric study of the photoionization of methane. The Journal of Chemical Physics, 48(5), 2337–2341. https://doi.org/10.1063/1.1669433

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