scholarly journals Some Characteristics of Gas-Phase Fast Atom Bombardment Ionization Mass Spectrometry: Chromium Hexacarbonyl and Trolox.

1995 ◽  
Vol 43 (1) ◽  
pp. 85-96 ◽  
Author(s):  
Toshihide NISHIMURA ◽  
Mitsuo TAKAYAMA
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Fast Atom Bombardment ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Chromium Hexacarbonyl ◽  
Fast Atom Bombardment Ionization

scholarly journals Chemical ionization mass spectrometry (CIMS) may not measure all gas-phase sulfuric acid if base molecules are present

2010 ◽  
Vol 10 (12) ◽  
pp. 30539-30568
Author(s):  
T. Kurtén ◽  
T. Petäjä ◽  
J. Smith ◽  
I. K. Ortega ◽  
M. Sipilä ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Sulfuric Acid ◽  
Gas Phase ◽  
Chemical Ionization ◽  
Measurement Data ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Proton Affinities ◽  
Reaction Thermodynamics

Abstract. The state-of-the art method for measuring atmospheric gas-phase sulfuric acid is chemical ionization mass spectrometry (CIMS) based on nitrate reagent ions. Using computed proton affinities and reaction thermodynamics for the relevant charging reactions, we show that in the presence of strong bases such as amines, which tend to cluster with the sulfuric acid molecules, a significant fraction of the total gas-phase sulfuric acid may not be measured by a CIMS instrument. If this is the case, this effect has to be taken into account in the interpretation of atmospheric sulfuric acid measurement data, as well as in intercomparison of different CIMS instruments, which likely have different susceptibilities to amine-sulfuric acid clustering.

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