scholarly journals A vacuum ultraviolet photoionization time-of-flight mass spectrometer with high sensitivity for study of gas-phase radical reaction in a flow tube

2018 ◽  
Vol 51 (3) ◽  
pp. 178-188 ◽  
Author(s):  
Zuoying Wen ◽  
Xiaofeng Tang ◽  
Chengcheng Wang ◽  
Christa Fittschen ◽  
Tao Wang ◽  
...  
Keyword(s):  
Gas Phase ◽  
Mass Spectrometer ◽  
Vacuum Ultraviolet ◽  
Radical Reaction ◽  
Time Of Flight ◽  
High Sensitivity ◽  
Flow Tube ◽  
Flight Mass Spectrometer

Vacuum Ultraviolet Single-Photon Ionization Time-of-Flight Mass Spectrometer

2011 ◽  
Vol 39 (10) ◽  
pp. 1470-1475 ◽  
Author(s):  
Guo-Bin TAN ◽  
Wei GAO ◽  
Zheng-Xu HUANG ◽  
Yi HONG ◽  
Zhong FU ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Vacuum Ultraviolet ◽  
Single Photon ◽  
Time Of Flight ◽  
Ionization Time ◽  
Single Photon Ionization ◽  
Flight Mass Spectrometer ◽  
Photon Ionization

scholarly journals A field-deployable, chemical ionization time-of-flight mass spectrometer

2011 ◽  
Vol 4 (7) ◽  
pp. 1471-1479 ◽  
Author(s):  
T. H. Bertram ◽  
J. R. Kimmel ◽  
T. A. Crisp ◽  
O. S. Ryder ◽  
R. L. N. Yatavelli ◽  
...  
Keyword(s):  
High Pressure ◽  
Formic Acid ◽  
Mass Spectrometer ◽  
Chemical Ionization ◽  
Time Of Flight ◽  
High Sensitivity ◽  
Negative Ion ◽  
Efficient Production ◽  
Ionization Time ◽  
Flight Mass Spectrometer

Abstract. We constructed a new chemical ionization time-of-flight mass spectrometer (CI-TOFMS) that measures atmospheric trace gases in real time with high sensitivity. We apply the technique to the measurement of formic acid via negative-ion proton transfer, using acetate as the reagent ion. A novel high pressure interface, incorporating two RF-only quadrupoles is used to efficiently focus ions through four stages of differential pumping before analysis with a compact TOFMS. The high ion-duty cycle (>20 %) of the TOFMS combined with the efficient production and transmission of ions in the high pressure interface results in a highly sensitive (>300 ions s−1 pptv−1 formic acid) instrument capable of measuring and saving complete mass spectra at rates faster than 10 Hz. We demonstrate the efficient transfer and detection of both bare ions and ion-molecule clusters, and characterize the instrument during field measurements aboard the R/V Atlantis as part of the CalNex campaign during the spring of 2010. The in-field short-term precision is better than 5 % at 1 pptv (pL/L), for 1-s averages. The detection limit (3 σ, 1-s averages) of the current version of the CI-TOFMS, as applied to the in situ detection of formic acid, is limited by the magnitude and variability in the background determination and was determined to be 4 pptv. Application of the CI-TOFMS to the detection of other inorganic and organic acids, as well as the use of different reagent ion molecules (e.g. I−, CF3O−, CO3−) is promising, as we have demonstrated efficient transmission and detection of both bare ions and their associated ion-molecule clusters.

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