Kw. Jung et al., INTRACLUSTER ION-MOLECULE REACTIONS WITHIN CF3H CLUSTER SYSTEM, International journal of mass spectrometry and ion processes, 135(2-3), 1994, pp. 119-128
Citations number
21
Categorie Soggetti
Spectroscopy,"Physics, Atomic, Molecular & Chemical
Ion/molecule reactions occurring within CF3H cluster ions are investig
ated mass spectrometrically utilizing electron impact ionization. The
study of fragmentation patterns indicates that the major reactive proc
ess is the formation of protonated cluster ions via the ejection of CF
3 from the energized cluster ion. The parentages of major fragment ion
s, e.g., (CF3H)nX+(X = CF2H and CF3, n greater-than-or-equal-to 1), ar
e assigned from both pressure and electron energy dependence of these
ions. The studies suggest that the precursors of (CF3H)nCF2H+ ions are
the protonated CF3H clusters whereas the (CF3H)nCF3+ cluster ions are
formed by a direct dissociative ionization of neutral (CF3H)q (q > n)
clusters. The other fragment ions are produced by the consecutive eje
ction reactions of neutral molecules (HF, H-2, and F2). Studies of the
reactions within mixed CF3H/CH4 clusters also support the possible re
active pathways for the formation of fragment ions.