An atmospheric pressure static reactor – ion trap mass spectrometer for studying gas-phase reactions

2010 ◽  
Vol 88 (10) ◽  
pp. 1017-1025 ◽  
Author(s):  
Fadel Wedian ◽  
Dean B. Atkinson
Keyword(s):  
Gas Phase ◽  
Mass Spectrometer ◽  
Excellent Agreement ◽  
Atmospheric Chemistry ◽  
Atmospheric Pressure ◽  
Ion Trap ◽  
Robust Method ◽  
Gas Phase Reactions ◽  
Ion Trap Mass Spectrometer ◽  
Primary Products

The design and operation of an atmospheric pressure static reactor coupled to an ion trap mass spectrometer is described. The reactor is designed for studying gas-phase reactions that are important in atmospheric chemistry. The system provides a simple and robust method for identifying the products of gas-phase reactions. Results for the reaction of O3 with 2,3-dimethyl-2-butene (tetramethylethylene, TME) are demonstrated as a proof of the principle for the performance of the static reactor. All of the previously reported major primary products of the reaction were observed, and the yields of two compounds (acetone and hydroxyacetone) were quantified, in excellent agreement with previous work. Several minor species were also observed, demonstrating the potential for this method to investigate the product channels for less well-studied atmospherically relevant reactions.

Gas Phase Reactions of Trimethylborate with the [M − H]− Ions of Nucleotides and Their Non-Covalent Homo- and Heterodimer Complexes

2003 ◽  
Vol 56 (5) ◽  
pp. 389 ◽  
Author(s):  
Ana K. Vrkic ◽  
Richard A. J. O'Hair
Keyword(s):  
Gas Phase ◽  
Mass Spectrometer ◽  
Ion Trap ◽  
Quadrupole Ion Trap ◽  
Methanol Molecule ◽  
Collision Induced Dissociation ◽  
Base Loss ◽  
Gas Phase Reactions ◽  
Ion Trap Mass Spectrometer ◽  
Neutral Base

Trimethylborate (TMB) reacts with deprotonated monomer, homo-, and heterodimer ions of nucleotides (2′-deoxyadenosine-5′-monophosphate [dAMP], 2′-deoxycytidine-5′-monophosphate [dCMP], 2′-deoxyguanosine-5′-monophosphate [dGMP], and 2′-deoxythymidine-5′-monophosphate [dTMP]) in a quadrupole ion trap mass spectrometer by addition with concomitant elimination of one or two methanol molecules (monomers), one or three methanol molecules (homodimers), and three methanol molecules (heterodimers). The mode of reaction appears to influence the observed rates, with the loss of only one methanol molecule corresponding to the fastest rate. There appears to be a structure–reactivity correlation for the monomers, with the [dGMP – H]– ions (which adopt a syn conformation of the guanine moiety) reacting fastest with TMB through the loss of only one methanol molecule. No such structure–reactivity trends are observed for the homo- and heterodimers. In addition, the collision-induced dissociation (CID) reactions of the [(dXMP)n − H]– (n = 1 or 2) as well as the [dXMP + dYMP – H + (CH3O)3B – 3(CH3OH)]– ions (where nucleotides X, Y = A, C, G, or T) were studied. The latter fragment to form [dXMP – H + BPO4]– and [dXMP – 3H + BPO3]– ions (where X = A, C, G, or T), while [dXMP – H]– ions fragment by neutral base loss. The homo- and heterodimers fragment to form [dXMP – H]– and [dXMP + HPO3]– ions, and the relative abundances of the [dXMP – H]– monomer ions from the heterodimers led to the following acidity order: dGMP ≈ dTMP > dCMP > dAMP.

Gas phase attachment of water and methanol to Ag(I) complexes with ?-amino acids in an ion trap mass spectrometer

2001 ◽  
Vol 15 (8) ◽  
pp. 615-622 ◽  
Author(s):  
B. A. Perera ◽  
M. P. Ince ◽  
E. R. Talaty ◽  
M. J. Van Stipdonk
Keyword(s):  
Amino Acids ◽  
Gas Phase ◽  
Mass Spectrometer ◽  
Ion Trap ◽  
Ion Trap Mass Spectrometer
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