Tunalbe coherent extreme ultraviolet radiation has been produced in nitrogen by third harmonic generation(THG)processes enhanced by two-photon resonance with the a^(1)II_(g)(v'=1)state and three-photon resonance with the c'_(4)^(1)Σ_(u)^(+)(v'=1)state,respectively.The highly resolved THG spectra imply that THG can be used to probe the higher excited states and to detect the rotational population of a molecular gas.
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机译：ChemInform Abstract: Resonant Second Harmonic Generation Study of Rhodamine B Adsorbed onto Fused Silica. Models of the Surface Optics for Calculation of the Molecular Orientation of Adsorbate.
