IR-UV double resonance spectroscopy on NO-X van der Waals complexes
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A modified discharge apparatus with the ability to select ions with different masses to arrive at the ion detector enabled us to measure a number of electronic REMPI (Resonance Enhanced Multi-Photon Ionization) spectra of NO-Ar and NO-Kr complexes. A detailed description of the apparatus is given, with several measured REMPI spectra of some known and unknown electronically excited states of these complexes. Meanwhile, a new approach to Infrared(IR)-Ultraviolet(UV) double resonance REMPI spectroscopy of NO-containing van der Waals complexes is described. The experiment is carried out utilizing REMPI detection through a hot band transition with a simultaneous frequency scan of both IR and UV lasers at the same time while keeping the energy sum constant. With the method applied to a number of different NO-X (X=Ar, Kr, CH4, N2 and CO), we managed to detect many double resonance spectra containing information on the vibrational and rotational structure of the ground state of NO-X complexes. In this dissertation, we report the near IR spectra of the NO-Kr and NO-CH4 complexes.