In‐tube collision‐induced dissociation for selected ion flow‐drift tube mass spectrometry, SIFDT‐MS: a case study of NO⁺ reactions with isomeric monoterpenes

Abstract

In-tube CID represents a simple and low-cost extension to SIFDT-MS that allows real-time identification of isomeric products of ion-molecule reactions on the basis of their structural differences and corresponding changes in fragmentation patterns with CID energy without significantly changing the net reaction time important for absolute quantification. Copyright © 2016 John Wiley & Sons, Ltd.

Quantification of volatile compounds released by roasted coffee by selected ion flow tube mass spectrometry

“…Thus, these analyte ions can readily be recognized in SIFT‐MS spectra at m/z 79 (M + ) and 109 (NO + .M) in a signal intensity ratio of 1:3, as expected from fundamental studies of the NO + /pyridine reaction . Finally, the charge transfer reaction of NO + with limonene has previously been shown to largely produce the molecular cation at m/z 136 in SIFT experiments …”

Styrene radical cations for chemical ionization mass spectrometry analyses of monoterpene hydrocarbons

“…Reagent and product ions were sampled through an 0.5 mm orifice to a quadrupole mass spectrometer, QMS, with a pulse‐counting electron multiplier as the ion detector. Ion residence times in the drift tube reactor, DTR, can be determined using Hadamard modulation and thus the ion‐molecule reaction energies, capture rate coefficients and reaction times can be calculated . In the current setup of the instrument reagent ions are generated in direct current (DC) discharges with an electrostatic reagent ion switching (ERIS) .…”

“…Hadamard modulation 23 and thus the ion-molecule reaction energies, capture rate coefficients and reaction times can be calculated. 24,25 In the current setup of the instrument reagent ions are generated in direct current (DC) discharges with an electrostatic reagent ion switching (ERIS). 26 A gaseous mixture for reagent ion generation can be introduced into a hollow cathode DC discharge with 1 mm orifice In order to produce styrene cations C 8 H 8 +• , NO + ions are generated in the SDT from a mixture of 1% NO in N 2 and styrene vapour is introduced into the focusing volume of the ion source (as indicated in Figure 1 Table 1.…”

Gas Phase Reactions of Iron, Copper and Rhodium Cations with Monoterpenes

“…In monoterpenes reactions with H3O + the product ions C6H9 + and C10H17 + are result of the dissociative proton transfer. In reactions with NO + charge transfer is a major channel with product ion C10H16 + , accompanied by the abstraction reactions with C10H15 + , C7H9 + , C7H8 + etc products and association reaction with NO + C10H16 product in camphene case [11,12]. This variety of product ions allows differentiation of several monoterpenes in the known mixture to some degree, but normally is not sufficient for selective analyses.…”