Abstract
ArF and/or KrF excimer laser irradiation on frozen nitrogen, formed on a Nb target using a refrigerator, has been performed. This technique makes it possible to effectively enhance the photo excited reaction between a laser beam and nitrogen because of the high density of nitrogen. The excitation and/or dissociation of nitrogen are examined using a spectroscope and a mass-spectrometer. As a result, the frozen nitrogen was excited via multiphoton processes and emissions of the transitions N2(A3 Σ u+)→ N2(X1 Σ g+), N2(C3 Π u)→ N2(B3 Π g) and N(2D)→ N(4S) were observed. Furthermore, it was clarified that both nitrogen molecules and atoms were emitted from the frozen nitrogen effectively by co-ablation with Nb target ablation at a higher laser irradiation energy density.
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