کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1193880 1492327 2010 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mass spectrometry (fragmentation ratios) of DNA base molecules following 80 keV proton impact with separation of direct ionization and electron capture processes
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Mass spectrometry (fragmentation ratios) of DNA base molecules following 80 keV proton impact with separation of direct ionization and electron capture processes
چکیده انگلیسی
The first fragmentation ratios are presented for the ionization of gas-phase DNA bases by 80 keV (1.8v0 in Bohr velocity units) proton impact. Event-by-event determination of the projectile charge state post-collision enables branching ratios to be determined for electron capture (EC) by the projectile and for direct ionization (DI) of the target molecule (without projectile neutralization). Results are compared with similar experiments on uracil [Tabet et al., Phys. Rev. A 81 (2010) 012711] and water [Gobet et al., Phys. Rev. A 70 (2004) 062716]. In all cases, whereas both processes (EC and DI) produce the same fragment ion groups, greater fragmentation ratios are observed for EC than for DI. Moreover the fragmentation ratio is greater for thymine than for adenine, cytosine, and uracil.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mass Spectrometry - Volume 292, Issues 1–3, 1 May 2010, Pages 53-63
نویسندگان
, , , , , , , ,