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1565461 
Journal Article 
Transport and stability of negative ions generated by negative corona discharge in air studied using ion mobility-oaTOF spectrometry 
Sabo, M; Okuyama, Yui; Kucera, M; Matejcik, S 
2013 
Yes 
International Journal of Mass Spectrometry
ISSN: 1387-3806 
334 
19-26 
WOS:000314903900004 
Negative corona discharge in wire to plane geometry was
investigated by ion mobility-orthogonal acceleration TOF mass spectrometry (IMS-oaTOF). The
formation of the ions in CD in synthetic air was studied under different gas flow, temperature
and discharge current conditions. In standard flow mode we have detected formation of NO2-center
dot(HNO3), NO3-center dot(HNO3) and NO3-center dot(HNO3)(2) ions even at relatively low water
concentration (5 ppm) and determined their reduced ion mobilities of 2.11, 2.02 and 1.75 cm(2)
V-1 s(-1). We have determined the lifetime of the NO3-center dot(HNO3)(2) ion at 295 and 308 K of
7.0(+/- 1.0)ms and 2.5(+/- 1.0)ms respectively. In the reverse flow the CD in wire to plane
geometry different negative ions were detected, dominated by O-2(-)(H2O)(n), (n = 0,1,2) with
reduced ion mobility of 2.27 cm(2) V-1 s(-1) and additional ions NO3- (2.29 cm(2) V-1 s(-1)) and
N2O2- (2.37 cm(2) V-1 s(-1)) present in the spectrum. (C) 2012 Elsevier B.V. All rights
reserved. 
Atmospheric pressure chemical ionisation; Ion mobility spectrometry; Corona discharge; Negative ions; Mass spectrometry