O3.2 - Detection of Aromatic/Aliphatic Hydrocarbons and Amines by Laser-Ion Mobility Spectrometry (LIMS)
- Event
- SENSOR+TEST Conferences 2009
2009-05-26 - 2009-05-28
Congress Center Nürnberg - Band
- Proceedings OPTO 2009 & IRS² 2009
- Chapter
- OPTO 3 - Applications and Devices
- Author(s)
- C. Oberhuettinger, A. Langmeier, H. Oberpriller, M. Kessler, J. Goebel, G. Mueller - EADS Innovation Works Germany, Munich, Germany
- Pages
- 75 - 79
- DOI
- 10.5162/opto09/o3.2
- ISBN
- 978-3-9810993-6-2
- Price
- free
Abstract
Trace detection of hydrocarbons has been investigated using a laser ion mobility spectrometer (LIMS). The LIMS instrument used employs resonant two-photon ionization as a mechanism for the generation of analyte gas ions. We find that LIMS easily ionizes aromatic and aliphatic hydrocarbons with conjugated and delocalized C-C double bond systems. Another class of organic compounds that could be successfully detected was amines. These latter substances contain double-occupied lone pair electrons localized on basic N atoms. All substances successfully detected feature a sizeable UV absorption within
a certain range of photon energies Eph. Two-photon ionization is observed in case the molecule-specific ionization energy EI complies with the energetic condition 2Eph > EI.