Formation of Negative Ions upon Dissociative Electron Attachment to the Astrochemically Relevant Molecule Aminoacetonitrile

详细信息    查看全文

• 作者：Andrzej Pelc ; Stefan E. Huber ; Carolina Matias ; Zbigniew Czupyt ; Stephan Denifl
• 刊名：Journal of Physical Chemistry A
• 出版年：2016
• 出版时间：February 18, 2016
• 年：2016
• 卷：120
• 期：6
• 页码：903-910
• 全文大小：346K
• ISSN：1520-5215

文摘

Aminoacetonitrile (NH₂CH₂CN, AAN) is a molecule relevant for interstellar chemistry and the chemical evolution of life. It is a very important molecule in the Strecker diagram explaining the formation of amino acids. In the present investigation, dissociative electron attachment to NH₂CN was studied in a crossed electron–molecular beams experiment in the electron energy range from about 0 to 17 eV. In this electron energy range, the following six anionic species were detected: C₂H₃N₂^–, C₂H₂N₂^–, C₂H₂N^–, C₂HN^–, CN^–, and NH₂^–. Possible reaction channels for all the measured negative ions are discussed, and the experimental results are compared with calculated thermochemical thresholds of the observed anions. Similar to other nitrile and aminonitrile compounds, the main anions detected were the negatively charged nitrile group, the dehydrogenated parent molecule, and the amino group. No parent anion was observed. Low anion yields were observed indicating that AAN is less prone to electron capture. Therefore, AAN can be considered to exhibit a relatively long lifetime under typical conditions in outer space.