CHARACTERIZATION OF THE MOLECULAR-IONS PRODUCED BY A DINITROALKANE INPOSITIVE MODE ION MOBILITY SPECTROMETRY WITH WATER, DICHLOROMETHANE AND AMMONIA REACTANT ION CHEMISTRIES
Wa. Munro et al., CHARACTERIZATION OF THE MOLECULAR-IONS PRODUCED BY A DINITROALKANE INPOSITIVE MODE ION MOBILITY SPECTROMETRY WITH WATER, DICHLOROMETHANE AND AMMONIA REACTANT ION CHEMISTRIES, Analytica chimica acta, 374(2-3), 1998, pp. 253-267
The effects of water at a concentration of less than 3 mg m(-3), ammon
ia at 0.61 mg m(-3) and dichloromethane at 77.3 mg m(-3) on the compos
ition of reactant ion peaks in the positive mode have been studied usi
ng an ion mobility spectrometer coupled to an Extrel quadrupole mass s
pectrometer at 318 K and atmospheric pressure under nitrogen. Further,
the positive mode ion mobility spectra of 2,3-dimethyl-2,3-dinitrobut
ane at 0.23 and 1.2 mg m(-3) have also been characterised by an ion mo
bility spectrometry coupled to a mass spectrometry (LMS-MS) operating
in the positive ion mode, with water at a concentration of less than 3
mg m(-3), ammonia at 0.61 mg m(-3) and dichloromethane at 77.3 mg m(-
3) as dopants. All of the dopants studied yielded 2,3-dimethyl-2,3-din
itrobutane molecular product ions in protonated water and ammonia clus
ters whose mobilities spanned the range 1.39-1.51 cm(2) V-1 s(-1) at 3
18 K and atmospheric pressure. The most sensitive and clearly resolved
responses were obtained using ammonia. No decomposition of the 2,3-di
methyl-2,3-dinitrobutane molecule was observed. (C) 1998 Elsevier Scie
nce B.V. All rights reserved.