Персона: Адамов, Алексей Юрьевич
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Институт нанотехнологий в электронике, спинтронике и фотонике
Институт ИНТЭЛ занимается научной деятельностью и подготовкой специалистов в области исследования физических принципов, проектирования и разработки технологий создания компонентной базы электроники гражданского и специального назначения, а также построения современных приборов на её основе.
Наша основная цель – это создание и развитие научно-образовательного центра мирового уровня в области наноструктурных материалов и устройств электроники, спинтроники, фотоники, а также создание эффективной инновационной среды в области СВЧ-электронной и радиационно-стойкой компонентной базы, источников ТГц излучения, ионно-кластерных технологий материалов.
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- ПубликацияТолько метаданныеInfluence of multiplexing conditions on artefact signal and the signal-to-noise ratio in the decoded data in Hadamard transform ion mobility spectrometry(2020) Sarycheva, A.; Adamov, A.; Poteshin, S. S.; Lagunov, S. S.; Sysoev, A. A.; Адамов, Алексей Юрьевич; Потешин, Сергей Станиславович; Лагунов, Сергей Сергеевич; Сысоев, Алексей АлександровичIn Hadamard transform ion mobility spectrometry (HT IMS), the signal-to-noise ratio is always lower for non-modified pseudorandom sequences than for modified sequences. Since the use of non-modified modulating pseudorandom sequences is strategically preferable from a duty cycle standpoint, we investigated the change in the interference signal when transitioning from non-modified modulating sequences to sequences modified by the addition of 1,3,5 and 7 zeros. The interfering signal in HT IMS with modified pseudorandom sequences was shown to be mainly random noise for all the cases except for modifying by incorporation of 1 zero. For standard samples of tetraalkylammonium halides, modulation by non-modified pseudorandom sequences is beneficial in the case of small numbers of averaged spectra (below similar to 40 averaged spectra compared to any modified pseudorandom sequences except for 1 zero modified and below similar to 200 averaged spectra compared to signal averaging ion mobility spectrometry) and worsens the signal-to-noise ratio in the case of large numbers of averaged spectra. Contrarily, modulation by modified pseudorandom sequences is beneficial for any number of averaged spectra, except for very small ones (below 15 averaged spectra compared to modulation by non-modified sequences). Pseudorandom sequence modified with 1 zero incorporation is beneficial in the case of below similar to 400 averaged spectra compared to any modified and non-modified pseudorandom sequences. The signal-to-noise ratio in conventional signal averaging mode ion mobility spectrometry is affected by random noise, whereas the HT IMS with non-modified pseudorandom sequences was demonstrated to be primarily affected by a systematic noise-like artefact signal. Because noise-like artefact signals were found to be reproducible, predicting models for interference signals could be generated to improve signal-to-noise ratio. This is significant because non-modified modulating sequences are limited by their poor signal-to-noise ratio. This improvement would increase the viability of non-modified modulating sequences which are preferred because of their higher sample utilization efficiency.
- ПубликацияТолько метаданныеInvestigation by simulation of the RF carpets for the transport of ions at atmospheric pressures(2020) Poteshin, S.; Burykina, A.; Adamov, A.; Sysoev, A.; Потешин, Сергей Станиславович; Адамов, Алексей Юрьевич; Сысоев, Алексей Александрович© The Author(s) 2020.Ion funnels, quadrupole, and multipole are well-known ion optic methods for transportation of ions. However, the methods are suitable for pressures below 30–40 Torr. The main loss of ions occurs in an inlet of mass spectrometer at atmospheric pressure. This work offers a focusing system, which employs a fine-structure electrode ion carpet. The focusing efficiency of fine-structure electrode was investigated by computer simulation methods and it was compared with theoretical estimation. The methods demonstrated good agreement with each other that promises a reliability of results. The authors found an optimal fine-structure electrode ion carpet configuration (electrodes width of 10 µm), which demonstrates suitable focusing efficiency and can be implemented in practice.
- ПубликацияТолько метаданныеThe Effect of Pseudorandom Sequence Systematicity on Signal-to-Noise Ratio in Hadamard Transform Ion Mobility Spectrometry(2021) Sarycheva, A. P.; Adamov, A. Y.; Lagunov, S. S.; Lapshov, G. V.; Poteshin, S. S.; Sysoev, A. A.; Адамов, Алексей Юрьевич; Лагунов, Сергей Сергеевич; Лапшов, Глеб Валерьевич; Потешин, Сергей Станиславович; Сысоев, Алексей Александрович© 2021, Pleiades Publishing, Ltd.Abstract: The formation of an artefact signal can greatly influence the sensitivity of the drift tube ion mobility spectrometer (IMS) in multiplex mode (Hadamard transform mode). This signal is a systematic error of multiplexed signal modulation via pseudorandom sequence (PRS), and it can appear as false peaks, or it can be similar to interference or noise. The artefact signal usually cannot be differentiated from the latter by standard mathematical processing algorithms. In Hadamard transform ion mobility spectrometry, the presence of an artefact signal when utilizing standard data processing algorithms results in the following situation. Even though each individual recovered spectrum demonstrates a noticeable improvement in signal-to-noise ratio due to forward Hadamard transform, this improvement is reduced or even disappears completely for averaged recovered multiplexed spectra when compared to the conventional IMS averaging mode. A noticeable improvement in signal-to-noise ratio can be achieved by modifying PRSs by incorporating fixed numbers of additional zeros after every element (modulation bin) of the conventional PRSs. The improvement can be explained because the addition suppresses systematic noise-like artefact signals. In this paper, we analyze the observed signal-to-noise ratio in averaged spectra for simulated via theoretical model and experimental data for various multiplexing modes of Hadamard transform. We also analyzed the influence of modulating PRSs’ “randomness” on signal-to-noise ratio in the resulting spectra in the case of non-modified sequences. We chose the standard deviation of PRS’s autocorrelation function, or the autocorrelation coefficient, to serve as the “randomness” criterion. For modulation with PRSs modified with additional zeros, we observed a considerable correlation between theoretical and experimental values of relative improvement of the signal-to-noise ratio. This indirectly proves the existence of constraints in Hadamard multiplexing mode when a statistically significant amount of individual spectra is averaged. This also leads to the necessity of improved strategies of data multiplexing and decoding for further sensitivity improvement. The choice of optimal PRS is part of the strategy’s search. One of the choice’s criterion is the minimization of the artefact signal. The data presented in this paper suggests that the autocorrelation coefficient as the criterion of choice for PRS is justified but not sufficient: it leaves the problem of PRS selection when searching for a strategy for sensitivity improvement in Hadamard transform ion mobility spectrometry.
- ПубликацияТолько метаданныеNegative Atmospheric Pressure Chemical Ionization of Chlorinated Hydrocarbons Studied by Ion Mobility Spectrometry (IMS) and IMS-MS Techniques(2022) Moravský, L.; Borkhari, A. F.; Adamov, A. Y.; Sysoev, A. A.; Papp, P.; Matejčík, Š.; Адамов, Алексей Юрьевич; Сысоев, Алексей АлександровичNegative polarity atmospheric pressure chemical ionization of selected chlorinated hydrocarbons (tetrachloromethane CCl4and hexachloroethane C2Cl6, dichloromethane CH2Cl2, trichloromethane CHCl3, 1,1,1,2-tetrachloroethane 1,1,1,2-C2H2Cl4, 1,1,2,2-tetrachloroethane 1,1,2,2,-C2H2Cl41,1,2-trichloroethane 1,1,2-C2H3Cl3, and 1,1,2-trichloroethane 1,1,2-C2HCl3) was studied using ion mobility spectrometry (IMS) and IMS combined with time-of-flight mass spectrometer (IMS-TOF MS) techniques, in the dry air and at two different drift gas temperatures (323 and 373 K). The ionization was performed using the O2-CO2(H2O)0,1reactant ions (RIs), and the dominant ionization reaction was the dissociative electron transfer. The ionization resulted in the appearance of Cl-ions for all substances and [O2H..Cl]-ions, which were absent in the case of perchlorinated substances. The quantum-chemical calculations at the density functional theory level of theory using the ωB97X-D/aug-cc-pVTZ method were performed to calculate the thermochemical data (heats of formations, electron affinities, reaction enthalpies) for RIs, neutral substances, neutral fragments, and the anionic fragments. The calculations supported the experimental observations regarding the endothermicity of the Cl-channel for all substances and the exothermicity of the [O2H..Cl]-channel for the tetrachloro- and trichloroethanes. © 2022 Springer New York LLC. All rights reserved.
- ПубликацияОткрытый доступВАКУУМНАЯ СИСТЕМА ДЛЯ ИСПЫТАНИЙ ЭЛЕКТРОФИЗИЧЕСКИХ УСТРОЙСТВ(Общество с ограниченной ответственностью "Лаборатория инновационных аналитических технологий", 2022) Сысоев, А. А.; Адамов, А. Ю.; Сысоева, Е. А.; Крайнов, М. Н.; Адамов, Алексей Юрьевич; Сысоев, Алексей АлександровичПолезная модель относится к области вакуумной техники, в частности к устройствам для испытаний электрофизических устройств при пониженном давлении. Техническим результатом полезной модели является компактность испытательного стенда, энергоэффективность, универсальность, возможность быстрого перехода между разными видами испытаний. Технический результат достигается тем, что вакуумная система для испытаний электрофизических устройств включает цилиндрическую прогреваемую испытательную вакуумную камеру с двумя фланцами размера Ду 250 CF, расположенными по торцам, к которым подключаются испытательная платформа и смотровое окно, и десятью фланцами размера Ду 40 CF, расположенными по окружности, к которым подключаются вакуумметр через адаптер с воздушным охлаждением, смотровые окна, электрические герметичные вводы в вакуум, игольчатый натекатель, вводы движения, высоковакуумный вентиль с фланцами Ду 40 CF, к которому через адаптер Ду 40 CF/ISO KF через быстроразъемное соединение подключается турбомолекулярный насос, откачиваемый мембранным форвакуумным насосом с возможностью изменения его быстроты откачивающего действия.