Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
ISSN-L : 1340-8097
検索
詳細検索
OR
閲覧
検索
62 巻, 3 号
選択された号の論文の1件中1～1を表示しています
すべての抄録を表示する
    • |<
    • <
    • 1
    • >
    • >|
ノート
  • DART正イオン化において観測されるアンモニウムイオン付加分子の生成機構
    杉村 夏彦, 古屋 麻美, 谷津 貴広, 渋江 俊道
    2014 年 62 巻 3 号 p. 25-27
    発行日: 2014/06/01
    公開日: 2014/06/24
    DOIhttps://doi.org/10.5702/massspec.14-56
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    Ammonium ion adduct molecules [M+NH4]+ that are produced in positive Direct Analysis in Real Time (DART) ionization mass spectrometry were examined using a selected set of compounds. The [M+NH4]+/[M+H]+ relative intensity ratio was dependent on the proton affinity (PA) of the compounds and ammonia (PA 846 kJ/mol). Ar-DART mass spectra of acetophenone (PA 850 kJ/mol) showed [M+D]+ and [M+ND4]+ ions. This observation suggests that hydrogen-bonded complexes between an ammonium ion ND4+ and an acetophenone molecule M initially formed an excited complex [M****D****ND3]+*, after which, some of the complexes then collapsed into [M+D]+. These results indicate that the mechanism responsible for the formation of [M+NH4]+ ion under ammonia chemical ionization and DART ionization is similar irrespectively of the compound under investigation.
    抄録全体を表示
    PDF形式でダウンロード (300K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top