Sampling Wand for an Ion Trap Mass Spectrometer

Authors: 
Keyong Hou, Wei Xu, R. Graham Cooks, Zheng Ouyang
Journal: 
Analytical Chemistry
Year: 
2011
Volume: 
83
Page Number (starting): 
1857
Page Number (ending): 
1861

A new sampling wand concept for ion trap mass spectrometers equipped with discontinuous atmospheric pressure interfaces (DAPI) has been implemented. The ion trap/DAPI combination facilitates the operation of miniature mass spectrometers equipped with ambient ionization sources. However, in the new implementation, instead of transferring ions pneumatically from a distant source, the mass analyzer and DAPI are separated from the main body of the mass spectrometer and installed at the end of a 1.2 m long wand. During ion introduction, ions are captured in the ion trap while the gas in which they are contained passes through the probe and is pumped away. The larger vacuum volume due to the extended wand improves the mass analysis sensitivity. The wand was tested using a modified hand-held ion trap mass spectrometer without additional power or pumping being required. Improved sensitivity was obtained as demonstrated with nano-electrospray ionization (ESI), atmospheric pressure chemical ionization (APCI), and low temperature plasma (LTP) probe analysis of liquid, gaseous, and solid samples, respectively.

Funding: 
National Science Foundation (CHE 0847205)
Funding: 
Office of Naval Research (N00014-05-1-0454)
publication_user_reference: 

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