&lt;title&gt;New high-efficiency ion-trap mobility detection system for narcotics&lt;/title&gt;

McGann, William J.

doi:10.1117/12.266761

Cited by 8 publications

(4 citation statements)

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“…For better understanding of the requirements to build a field switching (FS) ion shutter for a dual drift tube IMS, the basic setup of such an ion shutter for a single drift tube IMS is explained shortly. FS ion shutters are characterized by a field free ionization region ,− , and the injection of accumulated ions into a drift tube by switching the field inside the ionization region. For a single drift tube IMS the ionization region is located between a pusher electrode and an injection grid, which separates the ionization region from the drift tube.…”

Section: Field Switching Ion Shutter For Axial Dual Drift Tube Imsmentioning

confidence: 99%

Compact and Sensitive Dual Drift Tube Ion Mobility Spectrometer with a New Dual Field Switching Ion Shutter for Simultaneous Detection of Both Ion Polarities

et al. 2020

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Ion mobility spectrometers (IMS) with field switching ion shutters are an excellent choice for trace gas detection, being extremely sensitive while having fast response times. However, as different target molecules may form positive, negative, or even ions of both polarities, it is beneficial to simultaneously detect both ion polarities. Here, we present a dual drift tube IMS with a new dual field switching ion shutter for gating both ion polarities and an X-ray ionization source in orthogonal configuration. The dual field switching ion shutter allows significantly improved ion gating and ion accumulation due to improved shielding of the ionization region from the drift field. Equipped with two 75 mm long high-performance drift tubes, the dual IMS reaches high resolving power of R = 90 with detection limits in the lower pptv range for different ketones, chlorinated hydrocarbons and methyl salicylate that forms ions in both polarities.

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Section: Field Switching Ion Shutter For Axial Dual Drift Tube Imsmentioning

confidence: 99%

Compact and Sensitive Dual Drift Tube Ion Mobility Spectrometer with a New Dual Field Switching Ion Shutter for Simultaneous Detection of Both Ion Polarities

et al. 2020

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“…Если условие ортогональности РИ: выполняется, то при d/λ 0 =1/2 из (5) следует перемещение луча в секторе ±90° за время τ u . В литературе [16,17] этот эффект получил название «сверхбыстрого сканирования луча» (СБСЛ). Ширина зоны обзора здесь регулируется шагом решётки d, а однозначность -выбором τ u .…”

Section: условия перехода от рлс с фар к технологии Mimo рлс при испоunclassified

“…где -спектральная плотность чётно-симметричного степенного сигнала; Для автокорреляционной функции (15), с учётом (2) и (17), получим ,…”

Section: российский технологический журнал 2016 том 4 №unclassified

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2016

Российский технологический журнал

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//rtj.mirea.ru Российский технологический журнал 2016 Том 4 № 2 СОДЕРЖАНИЕ АНАЛИТИЧЕСКОЕ ПРИБОРОСТРОЕНИЕ И ТЕХНОЛОГИИ Капустин В.И., Коржавый А.П. Дрейф-спектрометрия: традиционные методы и перспективы развития Титов С.А., Маев Р.Г., Богаченков А.Н. Линзовый акустический микроскоп с линейной решеткой в режиме измерения параметров слоистых объектов 25 МИКРО-И НАНОЭЛЕКТРОНИКА. ФИЗИКА КОНДЕНСИРОВАННОГО СОСТОЯНИЯ Гродзенский Я.С., Чесалин А.Н. Анализ надежности изделий на основе проверки гипотез о величине параметра формы распределения Вейбулла ИНФОРМАЦИОННЫЕ СИСТЕМЫ. ИНФОРМАТИКА. ПРОБЛЕМЫ ИНФОРМАЦИОННОЙ БЕЗОПАСНОСТИ Басок Б.М., Захаров В.Н., Френкель С.Л. Об оценке чувствительности к сбоям тестов программ Шмейлин Б.З. Анализ влияния предварительной выборки в кэш-память на производительность микропроцессора СОВРЕМЕННЫЕ РАДИОТЕХНИЧЕСКИЕ И ТЕЛЕКОММУНИКАЦИОННЫЕ СИСТЕМЫ Вовшин Б.М., Куликов К.В. Сверхбыстрое сканирование луча и синтез короткого сигнала в поле излучения передающей решётки MIMO РЛС Заикин Б.А., Богадаров А.Ю., Котов А.Ф., Попонов П.В. Оценивание координат воздушной цели в дальномерной многопозиционной радиолокационной системе 65 Исаков В.Н. Математические модели детерминированных сигналов на основе систем элементарных функций 73 3 Российский технологический журнал 2016 Том 4 № 2

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“…For ion sources that can ionize inside a field-free region, the field switching (FS) ion shutter − is an alternative with superior performance. The generated ions are accumulated inside the field-free region prior to quickly pushing all ions into the drift region as a single narrow ion packet.…”

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confidence: 99%

Improving Ion Mobility Spectrometer Sensitivity through the Extended Field Switching Ion Shutter

et al. 2020

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Field switching ion shutters allow generating short ion packets with high ion densities by first ionizing for several milliseconds in a field-free ionization region and then quickly pushing the entire ion population out into the drift region. Thus, they are an excellent choice for compact ion mobility spectrometers with both high resolving power and low limits of detection. Here, we present an improved setup, named the extended field switching ion shutter. By generating a second field-free region between the ionization region and the drift region, shielding of the ionization region is significantly improved, even when using grids with higher optical transparency to improve ion transmission into the drift region. Furthermore, it is shown that under certain conditions, ion transmission through multiple grids in series can even surpass transmission through a single grid of the same transparency. For the studied ions, the signal intensity at low concentrations increases by approximately a factor of 7 to 9 for protonated monomers, 10 to 14 for proton-bound dimers, and 25 for the proton-bound 1-octanol trimer compared to the classical field switching shutter. However, due to the nonlinear response for ions containing multiple analyte molecules, the limits of detection improve only by a factor of 3 to 4 for proton-bound dimers and 3 for the proton-bound 1-octanol trimer. Nevertheless, this still leads to single-digit pptv limits of detection for protonated monomers and hundred pptv limits of detection for proton-bound dimers measured for a series of ketones. However, for the most intense peaks such as the reactant ion peak, a significant loss of resolving power by a factor of up to 1.4 was observed due to Coulomb repulsion.

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<title>New high-efficiency ion-trap mobility detection system for narcotics</title>

Cited by 8 publications

References 0 publications

Compact and Sensitive Dual Drift Tube Ion Mobility Spectrometer with a New Dual Field Switching Ion Shutter for Simultaneous Detection of Both Ion Polarities

Compact and Sensitive Dual Drift Tube Ion Mobility Spectrometer with a New Dual Field Switching Ion Shutter for Simultaneous Detection of Both Ion Polarities

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Improving Ion Mobility Spectrometer Sensitivity through the Extended Field Switching Ion Shutter

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