Takeshi Odagiri et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 225101 doi:10.1088/0953-4075/42/22/225101
Takeshi Odagiri1, Keishou Funatsu1, Takehiko Tanabe1, Isao H Suzuki2,3, Masashi Kitajima1 and Noriyuki Kouchi1
Show affiliationsThe cross sections for the generation of a fluorescence photon pair following photoexcitation of NO, differential with respect to the solid angles of the emission directions of the two photons, have been measured as a function of incident photon energy to investigate superexcited states of NO in the inner-valence range, in particular around the double ionization potential. Superexcited states of NO in the range 25–47 eV have been newly found as resonance peaks in the cross-section curve. We determined that the superexcited states are singly inner-valence excited and multiply excited states of NO. It is remarkable that there exist superexcited states of NO dissociating into neutral fragments even in the range above the double ionization potential at 38.476 eV. A dip in the cross-section curve is observed around 40 eV; the origin is discussed in terms of the decay dynamics of the superexcited states embedded in the double electronic continuum.
33.80.Eh Autoionization, photoionization, and photodetachment
33.50.Dq Fluorescence and phosphorescence spectra
33.80.Rv Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states)
Issue 22 (28 November 2009)
Received 16 September 2009, in final form 5 October 2009
Published 30 October 2009
Takeshi Odagiri et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 225101
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