TITLE

Selection and generation of waveforms for differential mobility spectrometry

AUTHOR(S)
Krylov, Evgeny V.; Coy, Stephen L.; Vandermey, John; Schneider, Bradley B.; Covey, Thomas R.; Nazarov, Erkinjon G.
PUB. DATE
February 2010
SOURCE
Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p024101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Devices based on differential mobility spectrometry (DMS) are used in a number of ways, including applications as ion prefilters for API-MS systems, as detectors or selectors in hybrid instruments (GC-DMS, DMS-IMS), and in standalone systems for chemical detection and identification. DMS ion separation is based on the relative difference between high field and low field ion mobility known as the alpha dependence, and requires the application of an intense asymmetric electric field known as the DMS separation field, typically in the megahertz frequency range. DMS performance depends on the waveform and on the magnitude of this separation field. In this paper, we analyze the relationship between separation waveform and DMS resolution and consider feasible separation field generators. We examine ideal and practical DMS separation field waveforms and discuss separation field generator circuit types and their implementations. To facilitate optimization of the generator designs, we present a set of relations that connect ion alpha dependence to DMS separation fields. Using these relationships we evaluate the DMS separation power of common generator types as a function of their waveform parameters. Optimal waveforms for the major types of DMS separation generators are determined for ions with various alpha dependences. These calculations are validated by comparison with experimental data.
ACCESSION #
48352676

 

Related Articles

  • Effects of Crystal-Induced Optical Incoherence in Electro-Optic Field Sensors. Garzarella, A.; Qadri, S. B.; Dong Ho Wu // Journal of Electronic Materials;Jun2010, Vol. 39 Issue 6, p811 

    Electro-optic (EO) sensors, used for the nonperturbative detection of electric fields, are strongly influenced by inhomogeneities and deviations of birefringence within the nonlinear crystal. These effects can reduce optical phase coherence in the probe beam, reducing sensor responsivity. The...

  • Ring current instabilities excited by the energetic oxygen ions. Kakad, A. P.; Singh, S. V.; Lakhina, G. S. // Physics of Plasmas;Sep2007, Vol. 14 Issue 9, p092902 

    The ring current instabilities driven by the energetic oxygen ions are investigated during the magnetic storm. The electrons and protons are considered to have Maxwellian distributions, while energetic oxygen ions are having loss-cone distribution. Dispersion relation for the quasielectrostatic...

  • Design and operating characteristics of new type cold cathode ion source. Hassan, A.; Bassal, N.; Zakhary, S. G. // Review of Scientific Instruments;Dec2007, Vol. 78 Issue 12, p123301 

    In this work, the design and performance of new type ion source are described. The discharge mechanism of the source is based on creating an arc discharge through a saddle electric field inside the discharge tube. The saddle electric field is created by immersing an annular anode inside the...

  • Improvement of voltage holding capability in the 500 keV negative ion source for JT-60SA. Tanaka, Y.; Hanada, M.; Kojima, A.; Akino, N.; Shimizu, T.; Ohshima, K.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Umeda, N.; Tobari, H.; Grisham, L. R.; JT-60 NBI Group // Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p02A719 

    Voltage holding capability of JT-60 negative ion source that has a large electrostatic negative ion accelerator with 45 cm×1.1 m acceleration grids was experimentally examined and improved to realize 500 keV, 22 A, and 100 s D- ion beams for JT-60 Super Advanced. The gap lengths in the...

  • Current accelerator. Jadhav, G. H. // AIP Conference Proceedings;Apr2013, Vol. 1524 Issue 1, p283 

    We have investigated motion of a charged particle in static parallel electric field. The field is parallel to a straight line having zero divergence and non-zero curl. It applies asymmetric electric force on the charged particle forcing the particle to follow a curved path. The path is...

  • Integrated optical sensor measures dynamic magnetic fields. Wallace, John // Laser Focus World;May2011, Vol. 47 Issue 5, p33 

    The article focuses on the integrated optical magnetic-field sensor developed by the scientists at the University of Electronic Science and Technology in Chengdu, China. It outlines the application of the device, which can sense magnetic fields oscillating at frequencies into the gigahertz range...

  • USE OF ALIGNED CARBON NANOTUBES AS ELECTRIC FIELD SENSORS. Chieh-Lien Lu; Hsin-Jung Tsai; Bee-Yu Wei; Wen-Kuang Hsu // Progress in Electromagnetics Research;2013, Vol. 137, p439 

    Application of electric field in normal to aligned carbon nanotubes creates Coulomb forces at intertube junctions and tubes become closely packed. Packed structure facilitates intertube transfer of carriers and reduced resistance is found to scale with field strength. Aggregated nanotubes are...

  • Eddy Current Position/Displacement Sensor Selection. Spohn, Dan // Design News;Feb2012, Vol. 67 Issue 2, p58 

    The article discusses inductive eddy current position/displacement sensors. Topics covered include targets for magnetic and non-magnetic eddy current sensors, relationships between sensor diameter and target diameter and considerations for sensor mounting. Also mentioned are the electromagnetic...

  • Capacitive Sensor Design Utilizing Conformal Mapping Methods. Eidenberger, N.; Zagar, B. G. // International Journal on Smart Sensing & Intelligent Systems;Mar2012, Vol. 5 Issue 1, p36 

    In this work we demonstrate the advantages of conformal mapping methods for the design of capacitive sensor setups. If the setups are modeled appropriately, the respective Laplace equations can be solved utilizing conformal mapping methods. These methods yield the equations de-scribing the...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics