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Summary 4

The aim of this paper is to discuss such aspects of orbitrap mass spectrometry as rotational and axial motion, modes of detection and some difficulties. Various ways of solving these problems are also suggested.

The first part is devoted to a rotational motion of ions in the trap. The authors set the requirements for ions to take stable trajectories. The main requirement for a stable trajectory is a balance between the centrifugal and centripetal forces acting on an ion. The results of simulations are depicted and described.

In the second part the authors describe an axial motion of ions. This motion consists of oscillation of ions around the z-axis of the trap which are independent of initial ion parameters. The parameters of this motion are given and their influence on the image current to be detected is discussed.

The third part of the paper describes some important aspects of ion current detection. To obtain a mass spectrum from the current, one should detect its image first and then apply the Fourier transform to it. Both positive and negative ion spectra can be obtained by the orbitrap. The authors also describe some examples of such experiments.

An important problem in the detection of a current is adding an RF voltage to the central electrode. This voltage results in the instability of some ions depending on their m/z relation. One of possible ways of solving this problem is to add more RF voltage to increase the axial amplitude of the ions of interest. Some pictures and graphs to illustrate such a way are given in the paper.

NOTE: A scientific article/ paper critical summary is also known as an article review. The reviewer is expected to describe in brief the investigation made: its novelty, methods applied, results obtained, interpretation of the findings/ results, original contribution to science, the paper merits and demerits, and to conclude with assessing its value.

TASK 5. Read closely your colleague's article/ paper and write its review in accordance with the following plan. You may also use the template given below.

Introduction

· The author's/ authors' name(s) and affiliation; the title of the paper being reviewed;

· The purpose of the paper and the research problem formulated;

· Its importance/ relevance.

Body

· Brief description of results/ findings;

· Strengths and significance of the investigation;

· Weaknesses and limitations.

Conclusion

· Summarizing the discussion;

· Making the final conclusion about the novelty and importance of the research contribution;

· Recommending the paper for presentation at a conference or publication in one of the NSTU editions in case it corresponds to the standards set for a research article/ paper. If the paper does not correspond to these standards, recommend your colleague (classmate) to improve its quality.

Review*

Author's name and affiliation, (e. g. Vladimir Kovalenko, Novosibirsk State Technical University), the paper title (e. g. Application of … ).

The paper (title) addresses a very acute problem of …. The author offers an original scheme of … .

The calculation results presented in this paper demonstrate the advantages of the proposed scheme over…. The simulation results obtained by the author seem promising, but real-life testing of… is required. Technical and economic assessment should also be made.

The author investigated a very acute and complicated problem of…. He proposed an original scheme … to improve… but experimental confirmation of the idea has yet to be achieved. With the real-life testing and experimental confirmation supplied, the paper might be recommended for presentation at the International Conference on … to be held in Russia next year.

Name of the review writer/ reviewer (e. g. Sergei Korotkov).

*The template is based on the review of the paper (author P. Morozov) written by O.Volkova. Both the paper (the English language version) and the review were written as examples within the course of English for doctoral students the authors took in NSTU graduate school (English class 2008–2009). The paper is based on the research P. Morozov was involved with.