Vibrationally resolved partial cross sections and asymmetry parameters for nitrogen K-shell photoionization of the N{sub 2}O molecule
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan) and Department of Chemistry, Texas A and M University, College Station, Texas 77843-3255 (United States)
We have measured the vibrationally resolved partial cross sections {sigma}{sub (v{sub 1}{sup '},v{sub 2}{sup '},v{sub 3}{sup '})} and asymmetry parameters {beta}{sub (v{sub 1}{sup '},v{sub 2}{sup '},v{sub 3}{sup '})} for N{sub c} and N{sub t} K-shell photoionization of the N{sub 2}O molecule in the {sigma}{sup *} shape resonance region above the N{sub t} and N{sub c} K-shell ionization thresholds. N{sub c} K-shell photoionization of the N{sub 2}O molecule predominantly causes the excitation of the quasisymmetric vibrations (v{sub 1}{sup '}), whereas N{sub t} K-shell photoionization causes both quasisymmetric and quasiantisymmetric vibrations (v{sub 1}{sup '} and v{sub 3}{sup '}) to be excited. The shape resonance energy in the N{sub c} K-shell photoionization increases with an increase in v{sub 1}{sup '}. The {beta}{sub (v{sub 1}{sup '},0,0)} curves for the N{sub c} K-shell photoionization exhibit maxima at energies close to the shape resonance energies for the individual values of v{sub 1}{sup '}. The shape resonance energy in the N{sub t} K-shell photoionization decreases with an increase in v{sub 1}{sup '} and slightly increases with an increase in v{sub 3}{sup '}. The {beta}{sub (v{sub 1}{sup '},0,0)} curves show a significant state dependence in the region of the shape resonance, with the curves shifting to lower energy as v{sub 1}{sup '} increases. The vibrational state dependence of the cross sections {sigma}{sub (v{sub 1}{sup '},v{sub 2}{sup '},v{sub 3}{sup '})} and asymmetry parameters {beta}{sub (v{sub 1}{sup '},v{sub 2}{sup '},v{sub 3}{sup '})} are well reproduced by the theoretical calculations using the multichannel Schwinger configuration interaction (MCSCI) method, including both the N{sub c} and N{sub t} ion states.
- OSTI ID:
- 21011210
- Journal Information:
- Physical Review. A, Vol. 76, Issue 1; Other Information: DOI: 10.1103/PhysRevA.76.012506; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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