Ion mobility spectrometry of explosives, the stability of gas phase ions, and prospectives for future explosive trace detectors

2022 ◽  
pp. 1-28
Author(s):  
G.A. Eiceman ◽  
R. Rajapakse ◽  
J.A. Stone
Keyword(s):  
Gas Phase ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Gas Phase Ions ◽  
The Stability

Ion mobility spectrometry experiments should be carried out at high temperatures to reduce uncertainties in the measurement of reduced mobilities

2021 ◽  
Author(s):  
Roberto Fernandez-Maestre ◽  
Martha Cecilia Daza
Keyword(s):  
Gas Phase ◽  
High Temperatures ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Gas Phase Ions ◽  
Identification Parameter ◽  
Reduced Mobility

In ion mobility spectrometry (IMS), reduced mobility (K0) is an identification parameter of gas-phase ions but, frequently, these values are different whether there is contamination with moisture and other volatile...

Ion Mobility Spectrometry of Gas-Phase Ions from Laser Ablation of Solids in Air at Ambient Pressure

2007 ◽  
Vol 61 (10) ◽  
pp. 1076-1083 ◽  
Author(s):  
G. A. Eiceman ◽  
D. Young ◽  
H. Schmidt ◽  
J. E. Rodriguez ◽  
J. I. Baumbach ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Gas Phase ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Ambient Pressure ◽  
Negative Ions ◽  
Principal Component ◽  
Positive Ions ◽  
Gas Phase Ions ◽  
Reduced Mobility

A mobility spectrometer was used to characterize gas-phase ions produced from laser ablation of solids in air at 100 °C and at ambient pressure with a beam focused to a diameter of <0.2 mm at energy of 6 mJ/pulse and wavelength of 266 nm. Metals, organic polymers, glass, graphite, and boron nitride exhibited characteristic mobility spectra with peaks at drift times between 8.75 and 12.5 ms (reduced mobility values of 2.19 to 1.53 cm2/Vs). Ion intensities increased initially and then decreased with repeated laser shots through drilling of the solid, and persistence of signal was proportional to hardness. A single comparatively narrow peak for negative ions was observed in mobility spectra for all materials and this was mass-identified as O2−. These ions were formed in air from reactions of oxygen with electrons emitted from the ablation step. Positive ions ablated directly from the solid were masked in ion mobility spectrometry/mass spectrometry (IMS/MS) studies by ionization of moisture and impurities. Positive ions from solids were seen only in the IMS analyzer at elevated temperature and low moisture. Under such conditions, materials were classified from mobility spectra alone with principal component analysis.

scholarly journals Gas Phase Stability of Protein Ions in a Cyclic Ion Mobility Spectrometry Traveling Wave Device

2019 ◽  
Vol 91 (12) ◽  
pp. 7554-7561 ◽  
Author(s):  
Charles Eldrid ◽  
Jakub Ujma ◽  
Symeon Kalfas ◽  
Nick Tomczyk ◽  
Kevin Giles ◽  
...  
Keyword(s):  
Gas Phase ◽  
Ion Mobility Spectrometry ◽  
Phase Stability ◽  
Ion Mobility ◽  
Traveling Wave ◽  
Protein Ions ◽  
Wave Device

scholarly journals Gas-Phase Chiral Separations by Ion Mobility Spectrometry

2006 ◽  
Vol 78 (24) ◽  
pp. 8200-8206 ◽  
Author(s):  
Prabha Dwivedi ◽  
Ching Wu ◽  
Laura M. Matz ◽  
Brian H. Clowers ◽  
William F. Siems ◽  
...  
Keyword(s):  
Gas Phase ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
Chiral Separations
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