| Autor: |
C. Oberhuettinger, Andreas Langmeier, Matthias Kessler, H. Oberpriller, J. Goebel, Gerhard J. Mueller |
| Rok vydání: |
2009 |
| Předmět: |
|
| Zdroj: |
Proceedings OPTO 2009 & IRS² 2009. |
| DOI: |
10.5162/opto09/o3.2 |
| Popis: |
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 >E I. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
