Article
Engineering, Mechanical
D. D. Tandel, Anindya Chatterjee, Atanu K. K. Mohanty
Summary: This paper studies the dynamics of a trapped ion in a mass spectrometer under the influence of quadrupolar RF and dipolar DC excitation. By calculating the electrostatic field for realistic geometries, we derive a classical Mathieu equation with a perturbation term and quadratic nonlinearity. We simplify the solution proposed by Plass, include the quadratic term, and develop a second-order averaging-based approximation. The results show that a stable periodic solution can be obtained using a two-frequency approximation, and we quantify the effect of the quadratic nonlinearity.
NONLINEAR DYNAMICS
(2023)
Article
Physics, Atomic, Molecular & Chemical
N. Konenkov
Summary: The study focuses on the nonlinear resonant excitation of ion oscillations in a linear trap, proposing the use of excitation contour to describe collective ion resonance. Factors such as excitation time, harmonic amplitudes, and initial ion cloud position depth are considered in the simulation of resonance peaks. The results can be beneficial for controlling processes like ion fragmentation and ion ejection.
EUROPEAN JOURNAL OF MASS SPECTROMETRY
(2021)
Article
Chemistry, Physical
Oskar Asvany, Sven Thorwirth, Philipp C. C. Schmid, Thomas Salomon, Stephan Schlemmer
Summary: The ro-vibrational and pure rotational spectra of the linear ion HC3O+ were studied using a novel action spectroscopic technique named leak-out spectroscopy (LOS). A total of 45 ro-vibrational transitions within the fundamental band of the ν(1) C-H stretching mode were measured. Surprisingly, two hot bands were detected despite the cryogenic operation temperature. A new double-resonance rotational measurement scheme was established based on the LOS method. In addition, a pulsed laser system was employed to record a low resolution vibrational spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Biochemical Research Methods
Samantha A. Mehnert, Joshua L. Fischer, Monica R. McDaniel, Kimberly C. Fabijanczuk, Scott A. McLuckey
Summary: In an electrodynamic ion trap, ions can be forced to higher frequency regions by applying a dipolar DC potential across opposing electrodes. This results in increased ripple motion and collisional activation, especially when a bath gas is present. The internal energy distribution of ions can be approximated by an effective temperature, and thermal activation parameters can be determined through dissociation kinetics. By subjecting the thermometer ion, protonated leucine enkephalin, to dipolar DC activation in different bath gases, and measuring T-eff as a function of DDC and RF voltages, a calibration and prediction model for T-eff can be established.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2023)
Article
Physics, Fluids & Plasmas
B. S. Nicks, S. Putvinski, T. Tajima
Summary: The Alfvén-ion cyclotron (AIC) mode is an instability that occurs in magnetized plasmas with anisotropic pressure. This study examines the stabilization mechanism of this mode through simulations and confirms the results of previous theoretical work.
PHYSICS OF PLASMAS
(2023)
Article
Biochemistry & Molecular Biology
Lingfeng Li, Tianyi Zhang, Deting Wang, Yunjing Zhang, Xingli He, Xiaozhi Wang, Peng Li
Summary: As the control of narcotics worsens and drug abuse leads to a record high death toll, there is a growing demand for on-site rapid detection of illegal drugs. This study developed a portable digital linear ion trap mass spectrometer with a separate-region corona discharge ionization source to meet this need. The system demonstrated excellent qualitative analysis capability and a large dynamic range.
Article
Chemistry, Physical
Ya-Chu Chan, Andrew Kortyna, David J. Nesbitt
Summary: The first high-resolution spectra of cold singlet bromomethylene HCBr in the CH stretching region were obtained using laser absorption methods. Several bands were identified and rotational constants were determined. The study also revealed the presence of perturbations in the fundamental band and observed nuclear spin hyperfine structures. Additionally, the intensity ratio of the a-type to b-type transitions in the CH stretch band was found to be larger than predicted by theory.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Optics
Liudmila A. Zhukas, Maverick J. Millican, Peter Svihra, Andrei Nomerotski, Boris B. Blinov
Summary: In this study, direct observation of micromotion for multiple ions in a laser-cooled trapped ion crystal was discussed using a time-resolving, single-photon-sensitive camera. The technique allows for measurement of micromotion amplitude and phase for each ion in the crystal, making it sensitive to tilts and shifts of the ion chain. This micromotion detection method is suitable for complex ion configurations and does not require additional equipment or laser beams.
Article
Physics, Atomic, Molecular & Chemical
N. Konenkov
Summary: This article provides a review of the development of commercial quadrupole mass spectrometers and methods to improve their performance. It discusses the simulation of ion traps, the effects of dipole excitation, and quadrupole excitation on the performance of the mass filter. It also explores the control of mass peak shape and the factors affecting the resolving power of linear ion traps. The numerical modeling results have been confirmed by experimental data.
EUROPEAN JOURNAL OF MASS SPECTROMETRY
(2023)
Article
Biochemical Research Methods
Abd-Allah A. El-Sheikh, Osama H. Elhamalawy, Sherif M. Taha, Fawzy I. Eissa
Summary: Accurate and highly sensitive analysis of folpet and captan was achieved using LC-QqQIT with a selective ion mode and optimized MS3 parameters. The developed method showed robustness and reliability through full validation, yielding recovery rates from 83 to 118% and LOQs ranging from 0.01 to 0.05 mg/kg in various food commodities. Monitoring results revealed the presence of captan residue in approximately 90% of apples and high concentrations of captan and folpet in sweet pepper. The novel MS3 method enables more reliable identification of these fungicides at lower LOQs compared to previous methods.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Yong Zhang, Qian-Yu Zhang, Wen-Li Bai, Wen-Cui Peng, Sheng-Guo He, Xin Tong
Summary: We describe a method to efficiently generate ultracold hydrogen molecular ions HD+ in a segmented linear ion trap. HD+ ions are produced by [2+1 & PRIME;] resonance-enhanced multiphoton ionization (REMPI) of an HD supersonic molecular beam, and sympathetically cooled using laser-cooled Be+ ions. The selective generation of HD+ ions is achieved using 201 nm and 395 nm pulse lasers. The loading rate of HD+ ions in the ion trap is determined by comparing experimental images with simulated images of Be+-HD+ bi-component Coulomb crystals, yielding an average rate of 4.3(2) ions per second. This method enables the production of state-selected HD+ ions and enhances the signal strengths of selected rovibrational transitions.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Analytical
Tarek Elawady, Alaa Khedr, Nahed EL-Enany, Fathalla Belal
Summary: This study investigates the degradation behavior and fragmentation pathways of Erdafitinib using validated stability-indicating HPLC and ion trap mass spectrometry methods. Six degradation products and an impurity were characterized and a reliable determination method was developed. The study provides important insights into the stability and degradation of Erdafitinib.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Analytical
Qian Xu, Jie Hong, Siyu Liu, Yanbing Zhai, Wei Xu
Summary: A miniature protein mass spectrometer was developed for rapid identification of proteins and their conformations, with high mass resolution and sensitivity. Coupling the instrument with a soft electrospray ionization source allowed the acquisition of mass spectra of native proteins.
Article
Engineering, Aerospace
Illia Zymak, Jan Zabka, Miroslav Polasek, Arnaud Sanderink, Jean-Pierre Lebreton, Bertrand Gaubicher, Barnabe Cherville, Anna Zymakova, Christelle Briois
Summary: A new laboratory Orbitrap mass spectrometer called OLYMPIA has been developed and used to test and develop technologies for the next generation of spaceborne mass spectrometers. It has also been used to study high-resolution space-relevant chemical processes.
Article
Physics, Multidisciplinary
A. Igarashi, D. Kato
Summary: We have calculated the cross sections for various processes in He+ + H collision and compared them with experimental and theoretical data. The excitation cross sections to H(n = 2) states agree well with the measurements of Geddes et al. The Balmer-alpha emission cross section of H is approximately half the size of the experimental data of Donnelly et al. The electron capture cross section is close to the experimental data of Lockwood et al and Olson et al. The ionization cross section is in accordance with the experimental data of Hsu et al.
Article
Physics, Atomic, Molecular & Chemical
N. Konenkov, K. E. Seregin, M. N. Makhmudov, A. N. Konenkov
EUROPEAN JOURNAL OF MASS SPECTROMETRY
(2020)
Article
Physics, Atomic, Molecular & Chemical
N. Konenkov
Summary: The study focuses on the nonlinear resonant excitation of ion oscillations in a linear trap, proposing the use of excitation contour to describe collective ion resonance. Factors such as excitation time, harmonic amplitudes, and initial ion cloud position depth are considered in the simulation of resonance peaks. The results can be beneficial for controlling processes like ion fragmentation and ion ejection.
EUROPEAN JOURNAL OF MASS SPECTROMETRY
(2021)
Article
Physics, Atomic, Molecular & Chemical
A. N. Konenkov, N. Konenkov, A. A. Sysoev
Summary: This paper presents the results of modeling AC and DC dipole excitation of ion oscillations in a quadrupole mass filter. The simulation was done by numerically integrating the ion motion equations, with ions' initial coordinates and velocities distributed normally. It is shown that AC excitation can control the resolution of the mass filter by changing the AC amplitude or phase. The instability bands can be used for mass selective excitation.
EUROPEAN JOURNAL OF MASS SPECTROMETRY
(2022)
Article
Physics, Atomic, Molecular & Chemical
A. A. Sysoev, A. N. Konenkov, N. V. Konenkov
Summary: The purpose of this study is to find the electrode structure of the analyser with round rods where the amplitudes of the 6th and 10th harmonics are equal. The shape of the mass peak and the modified stability diagram are determined under these conditions. The radian displacement of opposite rods is used to balance the amplitudes of the 6th and 10th spatial harmonics and improve the resolving power.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2022)
Article
Physics, Atomic, Molecular & Chemical
N. Konenkov
Summary: This article provides a review of the development of commercial quadrupole mass spectrometers and methods to improve their performance. It discusses the simulation of ion traps, the effects of dipole excitation, and quadrupole excitation on the performance of the mass filter. It also explores the control of mass peak shape and the factors affecting the resolving power of linear ion traps. The numerical modeling results have been confirmed by experimental data.
EUROPEAN JOURNAL OF MASS SPECTROMETRY
(2023)
Article
Physics, Atomic, Molecular & Chemical
P. V. Bugrov, A. A. Sysoev, A. N. Konenkov, N. V. Konenkov
Summary: The aim of this work is to study the properties of multipole electric fields generated by cylindrical electrodes. The study considers the convergence radius of the series expansion of electric potential into spatial harmonics and calculates the complex potential for the optimal configuration of the cylindrical electrodes. Additionally, a method is presented for accurately obtaining the expansion of potential into power series.
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2023)
Article
Biochemical Research Methods
Pavel V. Bugrov, Aleksey A. Sysoev, Nikolai V. Konenkov
Summary: This study investigates several factors leading to the degradation of the mass peak shape in a quadrupole mass filter with round rods. The analytical representation of the ion motion equations is obtained by decomposing the rod set field into multipole fields. Simulations reveal that a parallel shift of electrodes results in a shift of the peak along the mass number axis and dips at the peak apex. Unbalance of supply voltages causes a shift in the peak's position along the mass axis and creates a jump in the quadrupole offset potential.
JOURNAL OF MASS SPECTROMETRY
(2023)
