Direct Determination of Partial Wave Contributions in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>σ</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>Shape Resonance of CO Molecules
E. ShigemasaPhoton Factory, Institute of Materials Structure Science, Oho 1-1, Tsukuba-shi, Ibaraki-ken 305, JapanJiro AdachiInstitute for Molecular Science, Myodaiji, Okazaki 444, JapanK. SoejimaGraduate School of Science and Technology, Niigata University, Niigata-shi 950-21, JapanNaoki WatanabeThe Institute of Low Temperature Science, Hokkaido University, Sapporo, Hokkaido 060, JapanA. YagishitaPhoton Factory, Institute of Materials Structure Science, Oho 1-1, Tsukuba-shi, Ibaraki-ken 305, JapanN. A. CherepkovPhoton Factory, Institute of Materials Structure Science, Oho 1-1, Tsukuba-shi, Ibaraki-ken 305, Japan
1998lv
ABI
Annotatsiya
The first complete experiment for the C $K$-shell of CO molecules in the region of the ${\ensuremath{\sigma}}^{*}$ shape resonance has been performed by detecting photoelectrons in coincidence with fragment ions. Four ratios of dipole matrix elements and four phase shift differences have been extracted from the experimental data. Their analyses show that, in the ${\ensuremath{\sigma}}^{*}$ shape resonance due to the $l$ mixing, $d$ and $f$ partial waves give the main contribution to the cross section, and $f$ and $g$ waves give the main contribution to a rapid increase of phase shift by $\ensuremath{\pi}$.
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