Іонізація електронами молекул глютамінової кислоти та глютаміну

Автор(и)

  • A.M. Zavilopulo Institute of Electron Physics, National Academy of Sciences of Ukraine
  • S.S. Demes Institute for Nuclear Research (ATOMKI), Normandie University Le Havre, LOMC-UMR 6294 CNRS
  • E.Yu. Remeta Institute of Electron Physics, National Academy of Sciences of Ukraine
  • A.I. Bulhakova Institute of Electron Physics, National Academy of Sciences of Ukraine

DOI:

https://doi.org/10.15407/ujpe66.9.745

Ключові слова:

мас-спектр, амiнокислота, дисоцiативна iонiзацiя, iон-фрагмент, перерiз iонiзацiї

Анотація

Проведено комплекснi (експериментальнi i теоретичнi) дослiдження виходу позитив-них iонiв молекул глютамiнової кислоти (Glu-Acid) i глютамiну (Gln) в газовiй фазi, утворених в результатi дисоцiативної iонiзацiї цих амiнокислот електронним ударом. Експеримент проводився на установцi з монопольним мас-спектрометром ти-пу MX-7304A в дiапазонi масових чисел 10–150 Da. Дослiджено мас-спектри молекул глютамiнової кислоти i глютамiну при рiзних температурах, динамiку виходу iонiв-фрагментiв в iнтервалi температур випаровування вихiдної речовини 310–430 К та детально проаналiзовано особливостi процесiв утворення iонiв-фрагментiв таких молекул електронним ударом. Проведено ab initio розрахунки потенцiалiв iонiзацiї глютамiнової кислоти i глютамiну в адiабатичному наближеннi та за енергiями зв’язку HOMO- i LUMO-орбiталей нейтральних молекул. Отримано сумарнi перерiзи одноелектронної iонiзацiї обох молекул електронним ударом в Binary-Encounter-Bethe моделi та за формулою Гризiнського. Показано, що розрахованi молекулярнi константи добре узгоджуються з отриманими експериментальними даними.

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Опубліковано

2021-10-04

Як цитувати

Zavilopulo, A., Demes, S., Remeta, E., & Bulhakova, A. (2021). Іонізація електронами молекул глютамінової кислоти та глютаміну. Український фізичний журнал, 66(9), 745. https://doi.org/10.15407/ujpe66.9.745

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Розділ

Оптика, атоми і молекули