A new imaging-based method for alignment of multiple laser beams

Yair Yifrach, Rami Rahimi, Alexander Portnov, Ilana Bar

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A new method for multiple laser beams alignment, useful in a wide range of spectroscopies, is proposed and demonstrated. The method, based on the coupling of spatial map imaging (SMI) with velocity map imaging (VMI), aided beams visualization, through interrogation of the ionization signal of different species in a time-of-flight mass spectrometer. This approach is very effective for alignment and for evaluating the spatial overlap of laser beams with a molecular beam. This was demonstrated by monitoring the resonant two-photon ionization spectrum of 2-phenylethylamine (PEA) monomer and its hydrated (PEA–H2O) cluster and the ionization-loss stimulated Raman spectrum of the cluster, via VMIs accumulation, as a function of the exciting laser wavelength. The former permitted immediate classification of the features in the spectrum, corresponding to the molecular ion or the cluster. The proposed methodology will be useful in other challenging multiple laser beam experiments for spectroscopic studies and is expected to improve extensively their outcome.

Original languageEnglish
Article number118404
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume237
DOIs
StatePublished - 15 Aug 2020

Keywords

  • Ionization-loss stimulated Raman spectroscopy
  • Spatial map imaging
  • Velocity map imaging

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