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(A) Scheme of DAPPI ion source. Reprinted with permission from the authors of [66]. Copyright (2007) American Chemical Society. (B) Scheme of LAAPPI ion source. Reprinted with permission from the authors of [69]. Copyright (2012) American Chemical Society. (C) Scheme of DESI/PI ion source. Reprinted with permission from the authors of [73]. Copyright (2019) American Chemical Society.
