Mass spectrometric investigation and formation mechanisms of high-mass species in the downstream region of Ar/CF4/O2 plasmas
文献信息
Kenji Furuya, Akihiro Ide, Hiroshi Okumura, Akira Harata
Mass analysis has been conducted on the positive ions and neutral species in the downstream region of Ar/CF4/O2 plasmas. The neutral species have been ionized by Li+ attachment before mass analysis. The CF2O+, C2F5O+ and CnF2n−1O+ (1 ≤n≤ 6) positive ions and the CnF2nO (1 ≤n≤ 7) neutral species have been found as the species composed of C, F and O. The intensity of C2F4O observed via the Li+-attachment mass spectra has been exceptionally weak in comparison to the intensities of CF2O and C3F6O. In addition, neither C2F4 nor C3F6 have been observed, although CnF2n (n≥ 4) have been observed as the species composed only of C and F. These findings suggest that CnF2nO (n≥ 3) are produced mainly through the following reactions: CF3(CF2)mCF = CF2 + O(3P) → CF2(3B1) + CF3(CF2)mCFO (m≥ 1) and CF3(CF2)mCF = CF(CF2)nCF3 + O(3P) → CF3(CF2)mCF + CF3(CF2)nCFO (m, n≥ 1), where the CF3(CF2)n– group might have side chains, as in (CF3)2CF(CF2)n−2–. With the help of quantum chemistry calculations of reaction enthalpies and transition states, the formation mechanisms of the observed species have been discussed in detail.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.














