Absolute Dissociative Electron Attachment Cross Sections in Acetylene and its Deuterated Analogue

作者：May Olivier^*; Fedor Juraj; Allan Michael

来源：Chimia, 2010, 64(3): 173-176.

DOI：10.2533/chimia.2010.173

• Absolute cross section
• Dissociative electron attachment
• Isotope effect

An instrument for the measurement of absolute dissociative electron attachment cross sections was constructed and applied to two prototype molecules, acetylene (C(2)H(2)) and deuterated acetylene (C(2)D(2)). The isotope effect at the first dissociative electron attachment band at 3 eV was determined - the cross section for C(2)D(-) / C(2)D(2) is 14.4 times smaller than that for C(2)H(-) /C(2)H(2). The results play a central role in validating recent theoretical work of Chourou and Orel. The dominant fragments at the second dissociative attachment band around 8 eV are the light fragments H(-) or D(-). These bands exhibit weaker isotope effects.

• 出版日期2010