کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1193505 1492292 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Atmospheric pressure photoionization mass spectrometry of guanine using tunable synchrotron VUV radiation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Atmospheric pressure photoionization mass spectrometry of guanine using tunable synchrotron VUV radiation
چکیده انگلیسی

Atmospheric pressure photoionization (APPI) source coupled to a krypton discharge lamp permits to specifically generate either radical cation or protonated species for guanine depending on the dopant molecule. In order to scrutinize the consecutive or competitive chemical reactions occurring in the gas phase, a tunable synchrotron VUV radiation source was coupled for the first time to the APPI source of a hybrid quadrupole time-of-flight mass spectrometer. Experiments were achieved at different photon energies close to the ionization energy of the different reagents. This unique set-up allowed the confirmation of theoretical models developed by several groups over the last ten years concerning ionization processes underlying APPI, such as proton or charge transfer reactions.

Figure optionsDownload high-quality image (98 K)Download as PowerPoint slideHighlights
► First experiments coupling a commercial APPI source with a synchrotron radiation facility.
► Without dopant: linear increase of the [M+H]+ ion from guanine for energy greater than 8.2 eV.
► With anisole as a dopant: appearance of a radical cation M+.
► Increase of the M+/[M+H]+ ratio between 8.2 and 8.7 eV.
► Ionization mechanisms imply direct photoionization, proton and charge transfers.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mass Spectrometry - Volumes 321–322, 15 May 2012, Pages 14–18
نویسندگان
, , , , ,