Constraining the sensitivity of iodide adduct chemical ionization mass spectrometry to multifunctional organic molecules using the collision limit and thermodynamic stability of iodide ion adducts

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Lopez-Hilfiker , F D , Iyer , S , Mohr , C , Lee , B H , D'Ambro , E L , Kurten , T & Thornton , J A 2016 , ' Constraining the sensitivity of iodide adduct chemical ionization mass spectrometry to multifunctional organic molecules using the collision limit and thermodynamic stability of iodide ion adducts ' Atmospheric Measurement Techniques , vol. 9 , no. 4 , pp. 1505-1512 . DOI: 10.5194/amt-9-1505-2016

Title: Constraining the sensitivity of iodide adduct chemical ionization mass spectrometry to multifunctional organic molecules using the collision limit and thermodynamic stability of iodide ion adducts
Author: Lopez-Hilfiker, Felipe D.; Iyer, Siddharth; Mohr, Claudia; Lee, Ben H.; D'Ambro, Emma L.; Kurten, Theo; Thornton, Joel A.
Contributor: University of Helsinki, Department
University of Helsinki, Department of Chemistry
Date: 2016
Language: eng
Number of pages: 8
Belongs to series: Atmospheric Measurement Techniques
ISSN: 1867-1381
URI: http://hdl.handle.net/10138/175018
Abstract: The sensitivity of a chemical ionization mass spectrometer (ions formed per number density of analytes) is fundamentally limited by the collision frequency between reagent ions and analytes, known as the collision limit, the ion-molecule reaction time, and the transmission efficiency of product ions to the detector. We use the response of a time-of-flight chemical ionization mass spectrometer (ToF-CIMS) to N2O5, known to react with iodide at the collision limit, to constrain the combined effects of ion-molecule reaction time, which is strongly influenced by mixing and ion losses in the ion-molecule reaction drift tube. A mass spectrometric voltage scanning procedure elucidates the relative binding energies of the ion adducts, which influence the transmission efficiency of molecular ions through the electric fields within the vacuum chamber. Together, this information provides a critical constraint on the sensitivity of a ToF-CIMS towards a wide suite of routinely detected multifunctional organic molecules for which no calibration standards exist. We describe the scanning procedure and collision limit determination, and we show results from the application of these constraints to the measurement of organic aerosol composition at two different field locations.
Subject: HIGH-RESOLUTION
ATMOSPHERIC AMINES
ONLINE ANALYSIS
CIMS
AEROSOL
GAS
N2O5
TOF
MS
114 Physical sciences
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