scholarly journals ESTIMATION OF SPACE CHARGE INFLUENCE ON RESOLUTION OF ION-MOBILITY SPECTROMETER

2021 ◽  
Vol 31 (4) ◽  
pp. 41-54
Author(s):  
I. V. Kurnin ◽  
Keyword(s):  
Space Charge ◽  
Numerical Solution ◽  
Analytical Model ◽  
Ion Mobility ◽  
Ion Density ◽  
Ion Mobility Spectrometer ◽  
Reaction Region ◽  
Ion Cloud ◽  
Comparison Of The Results

The paper presents an analytical model describing the dynamics of ion cloud, taking into account the action of space charge during a motion in ion mobility spectrometer — starting from the reaction region, where the shutter forms an ion pulse, and the further drift of the formed ion pulse towards the collector. The presented model lets to estimate the degree of influence of the space charge on possible ion losses and the resolution of ion mobility spectrometer. The effect of the space charge becomes noticeable, starting with the ion density of 106 cm–3. Comparison of the results obtained using the analytical model with the results of numerical solution of the initial equations shows that they practically coincide.

Measuring the effects of Coulomb repulsion via signal decay in an atmospheric pressure laser ionization ion mobility spectrometer

2018 ◽  
Vol 24 (4) ◽  
pp. 330-336 ◽  
Author(s):  
Marvin Ihlenborg ◽  
Ann-Kathrin Schuster ◽  
Jürgen Grotemeyer ◽  
Frank Gunzer
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ion Mobility ◽  
Atmospheric Pressure ◽  
Coulomb Repulsion ◽  
Laser Ionization ◽  
Ion Mobility Spectrometer ◽  
Signal Decay ◽  
Ionization Sources ◽  
Reaction Region

Using lasers in ion mobility spectrometry offers a lot of advantages compared to standard ionization sources. Especially, the ion yield can be drastically increased. It can, however, reach levels where the Coulomb repulsion leads to unwanted side effects. Here, we investigate how the Coulomb repulsion can be detected apart from the typical signal broadening by measuring effects created already in the reaction region and comparing them with corresponding finite element method simulations.

Space Charge Effects on Resolution in a Miniature Ion Mobility Spectrometer

2000 ◽  
Vol 72 (23) ◽  
pp. 5787-5791 ◽  
Author(s):  
Jun Xu ◽  
William B. Whitten ◽  
J. Michael Ramsey
Keyword(s):  
Space Charge ◽  
Ion Mobility ◽  
Space Charge Effects ◽  
Charge Effects ◽  
Ion Mobility Spectrometer

Space Charge Effect in Spectrometers of Ion Mobility Increment with a Cylindrical Drift Chamber

2007 ◽  
Vol 13 (4) ◽  
pp. 259-272 ◽  
Author(s):  
A.A. Elistratov ◽  
L.A. Sherbakov
Keyword(s):  
Space Charge ◽  
Ion Mobility ◽  
Drift Chamber ◽  
Space Charge Effect ◽  
Single Type ◽  
Charge Effect ◽  
Ion Density ◽  
Focusing Effect ◽  
High Frequency Electric Field ◽  
Order Of Magnitude

We have amplified the model for the drift of ions under a non-uniform, high-frequency electric field by taking space charge effect into account. By this means, we have investigated the effect of space charge on the dynamics of a single type of ions in a spectrometer of ion mobility increment with a cylindrical drift chamber. The counteraction of the space charge effect and the focusing effect is investigated. The output ion current saturation caused by the effect of the space charge is observed. The shape of the ion peak, taking into consideration the space charge effect, has been obtained. We show that the effect of the space charge is sufficient for the relative ion density greater than 10 ppt by order of magnitude (for a cylindrical geometry spectrometer with typical parameters).

Improving the analytical performance of ion mobility spectrometer using a non-radioactive electron source

2016 ◽  
Vol 19 (4) ◽  
pp. 175-182 ◽  
Author(s):  
Andre Heptner ◽  
Nico Angerstein ◽  
Tobias Reinecke ◽  
Erik Bunert ◽  
Ansgar T. Kirk ◽  
...  
Keyword(s):  
Ion Mobility ◽  
Electron Source ◽  
Analytical Performance ◽  
Ion Mobility Spectrometer
Sign in / Sign up

Export Citation Format

Share Document