Detector based on time-resolved ion-induced voltage in laser multiphoton ionization and laser-induced fluorescence

Iris Litani-Barzilai, Valery Bulatov, Vladimir V. Gridin, Israel Schechter*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


The time-resolved ion-induced voltages obtained from multiphoton ionization (MPI) in gases were applied, for the first time, together with time-resolved laser-induced fluorescence (TR-LIF) for fast detection of organic compounds in ambient air. The target compounds were polycyclic aromatic hydrocarbons (PAHs) and nitroaromatics. The concepts of the proposed method are presented and examined. It is shown that the MPI signals allow for estimation of the molecular weight, while the fluorescence data supply additional quantitative and qualitative information. A 3D data presentation is suggested for obtaining selectivity. The proposed dimensions are the MPI-based mass estimation, the maximum LIF wavelength and the measured fluorescence lifetime. Since all required data are acquired simultaneously and since the setup can be continuously operated, this analytical concept is suggested for on-line applications. The common air components are not ionized at the selected wavelengths and only the organic pollutants are detected under these conditions. Moreover, it is shown that the resonant MPI mode provides a certain level of selectivity. Therefore, this setup may become the basis of an air sniffer.

Original languageEnglish
Pages (from-to)151-156
Number of pages6
JournalAnalytica Chimica Acta
Issue number2
StatePublished - 16 Jan 2004
Externally publishedYes


  • MPI-based mass estimation
  • Organic pollutants
  • Selectivity


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