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Proceedings Paper

Effect of nitrogen gas on the lifetime of carbon nanotube field emitters for electron-impact ionization mass spectrometry
Author(s): Stephanie A. Getty; Rachael A. Bis; Stacy Snyder; Emily Gehrels; Kristina Ramirez; Todd T. King; Patrick A. Roman; Paul R. Mahaffy
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Paper Abstract

The lifetime of a patterned carbon nanotube film is evaluated for use as the cold cathode field emission ionization source of a miniaturized mass spectrometer. Emitted current is measured as a function of time for varying partial pressures of nitrogen gas to explore the robustness and lifetime of carbon nanotube cathodes near the expected operational voltages (70-100 eV) for efficient ionization in mass spectrometry. As expected, cathode lifetime scales inversely with partial pressure of nitrogen. Results are presented within the context of previous carbon nanotube investigations, and implications for planetary science mass spectrometry applications are discussed.

Paper Details

Date Published: 30 April 2008
PDF: 10 pages
Proc. SPIE 6959, Micro (MEMS) and Nanotechnologies for Space, Defense, and Security II, 695907 (30 April 2008); doi: 10.1117/12.776914
Show Author Affiliations
Stephanie A. Getty, NASA Goddard Space Flight Ctr. (United States)
Rachael A. Bis, NASA Goddard Space Flight Ctr. (United States)
Stacy Snyder, Lehigh Univ. (United States)
Emily Gehrels, NASA Goddard Space Flight Ctr. (United States)
Kristina Ramirez, NASA Goddard Space Flight Ctr. (United States)
Todd T. King, NASA Goddard Space Flight Ctr. (United States)
Patrick A. Roman, NASA Goddard Space Flight Ctr. (United States)
Paul R. Mahaffy, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 6959:
Micro (MEMS) and Nanotechnologies for Space, Defense, and Security II
Thomas George; Zhongyang Cheng, Editor(s)

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