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Issue 24, 2017
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Comment on “Non-linear photoelectron effect contributes to the formation of negative matrix ions in UV-MALDI”

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Abstract

Alonso and Zenobi (AZ) recently claimed “a comprehensive theoretical description of negative ion formation in UV-MALDI” (Phys. Chem. Chem. Phys., 2016, 18, 19574). Emphasizing photoelectrons, it is found to be unphysical in several respects, including violation of charge and mass conservation, and in the treatment of ablation, expansion and electron capture. It is not internally consistent, and ions created by the photoelectron mechanism are given artificial preference. Although AZ claimed the “first proposal for a comprehensive theoretical description of negative ion formation in UV-MALDI”, the Coupled Physical and Chemical Dynamics model has successfully reproduced a number of phenomena relevant to negative ion production over many years.

Graphical abstract: Comment on “Non-linear photoelectron effect contributes to the formation of negative matrix ions in UV-MALDI”

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Publication details

The article was received on 20 Jan 2017, accepted on 05 Jun 2017 and first published on 05 Jun 2017


Article type: Comment
DOI: 10.1039/C7CP00454K
Citation: Phys. Chem. Chem. Phys., 2017,19, 16276-16279
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    Comment on “Non-linear photoelectron effect contributes to the formation of negative matrix ions in UV-MALDI”

    R. Knochenmuss, Phys. Chem. Chem. Phys., 2017, 19, 16276
    DOI: 10.1039/C7CP00454K

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