Design and Performance of a Compact Li⁺ Ion Attachment Mass Spectrometry System with an Atmospheric Sampling Device

Abstract

This report describes the development of a compact ion attachment mass spectrometry system. A single turbomolecular pump was employed to fill the basic requirements for vacuum conditions simply and cost-effectively, without the need for a differential pumping stage. A Li + ion source was placed in the first of two vacuum chambers; a 0.4 mm aperture allowed the product ions to enter the second chamber for mass analysis. With the present system, any chemical species, including radical intermediates, can be detected at atmospheric pressure in real-time. The minimum detectable amount (at S/N=3) of toluene was around 1.3×10 -12 g/s with a linearity greater than 10 4 . For illustrative purposes, we tested the system on laboratory air and on aroma compounds in the headspace of the Yuzu plant, Citrus junos.

Gas-Phase Lithium Cation Basicity: Revisiting the High Basicity Range by Experiment and Theory

“…Lithium adduct generation occurs easily, starting in general from a condensed phase, when polar functional groups are present in analytes [21][22][23][24][25]. Another specific tool, which emerged from the observation of direct gas-phase cationization by Li + , the so-called ion attachment mass spectrometry (IAMS) [26][27][28][29], makes use of the attachment of the cation to neutral species in the gas phase.…”

Effect of the Number of Methyl Groups on the Cation Affinity of Oxygen, Nitrogen, and Phosphorus Sites of Lewis Bases

“…Cation/molecule reactions, including proton transfer, play key roles in atmospheric, biological, and chemical systems. Consequently, the fundamental aspects and applications of such processes were largely developed. − …”

Development of a time-of-flight mass spectrometer combined with an ion-attachment method for multicomponent gas analysis

“…[12][13][14][15][16][17] The IAMS device marketed by Anelva was developed into a quadruple mass spectrometry (QMS) device; the OMS technique was developed by Fujii and coworkers. 9,[18][19][20][21][22] Distinguishing nitrogen and nitric oxide is difficult as they have similar mass numbers; thus, the mass resolution of the QMS device is unsatisfactory. Recently, Saito has developed time-of-flight (TOF) MS employing the IA technique.…”