The molecular and dissociative photoionization of ethane in the inner and outer valence energy regions

Abstract

The molecular and dissociative photoionization of C2H6 has been studied using synchrotron radiation within the energy range 11-40 eV. Positive and negative photoion mass spectra and threshold photoelectron spectra have been obtained. These show that superexcited states, which can decay through ion pair formation, play an important role in the photodissociative ionization process. The positive photoion yield curves display significant and hitherto unobserved structures, which are unrelated to those present in the photoelectron spectra.

Methyl Radicals in Oxidative Coupling of Methane Directly Confirmed by Synchrotron VUV Photoionization Mass Spectroscopy

“…The m/z = 30 signal gives two ionization thresholds of 10.86 and 11.53 eV (Figure 4D) respectively corresponding to formaldehyde (HCHO) and ethane (C 2 H 6 ). The observed inflection at ~12.5 eV in Figure 4d corresponds to the 2 E g electronic state of C 2 H 6 + ion34. The m/z = 32 signal gives two ionization thresholds of 10.82 and 12.05 eV (Figure 4E) respectively corresponding to methanol (CH 3 OH) and oxygen (O 2 ).…”

CRITICAL REVIEW OF N, N + , N + 2 , N ++ , And N ++ 2 MAIN PRODUCTION PROCESSES AND REACTIONS OF RELEVANCE TO TITAN'S ATMOSPHERE

“…It is equal to the Langevin rate (2.36 × 10 −9 cm 3 s −1 ) within experimental uncertainties, so the rate constant at 150 K is most probably the same. Product branching ratios cannot be precisely derived from these experiments, as the derivation of such ratios would have required coincidence measurements between singly charged product ions as in the studies from Lockyear et al (2011) (Mackie et al 2002;Stockbauer 1973 (±25%) for electron recombination Absolute cross section measurements have been carried out by Seiersen et al (2003) using the heavy-ion storage ring ASTRID in the relative collision energy range 10 −4 to 10 eV. They studied the recombination of 14 N 15 N ++ and deduced from their data analysis a rate constant of k = (5.8 ± 2.9) × 10 −7 (T e /300) −0.5 cm 3 s −1 , which is about 2.5 times greater than the dissociative recombination of N + 2 at room temperature.…”

Ethane cation decomposition characterization by EBMI spectroscopy: gas‐phase dissociative recombination as a source of secondary products

“…Much is known about the decomposition of C 2 H 6 + and the ions derived from its dehydrogenation products, C 2 H 4 + and C 2 H 2 + . Mackie et al . have reported ion distribution data from photoionization of C 2 H 6 by 11–40 eV radiation followed by quadrupole mass spectrometry.…”