Multiphoton ionization (MPI) spectroscopy of tungsten hexafluoride: Experimental observation of Molecular spectrum using MPI

In general, multiphoton ionization (MPI) spectroscopy of metal complexes shows the dissociation and ionization of the compounds. Well-structured molecular ionization spectrum is not observed yet for metal complexes by use of the multiphoton ionization technique. Tungsten hexafluoride was selected to get a molecular spectrum with MPI technique because it had a very high dissociation energy that might suppress facile photofragmentation. Also, WF6 has high vapor pressure(>1,000 torr at 300 K), which means heating is not required to get enough sample concentration in the molecular beam. The electronic absorption spectrum and the electron impact spectrum of WF6 were previously studied. The assignment of WF6 spectrum obtained by MPI can be compared with those published results. Experimentally, we observed the molecular MPI spectra of WF6 and the clear assignments are not easy with current results as well as previous works.