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Direct Probe of the Shape Resonance Mechanism in 2 σ g -Shell Photoionization of the N 2 </mml…

2002; American Physical Society; Volume: 88; Issue: 6 Linguagem: Inglês

10.1103/physrevlett.88.063003

1092-0145

S. MOTOKI, Jun‐ichi Adachi, K. Ito, K. Ishii, K Soejima, A. Yagishita, S. Semenov, N. A. Cherepkov,

Spectroscopy and Quantum Chemical Studies

Angular distributions of photoelectrons from a 2sigma(g) shell of fixed-in-space N2 molecules have been measured for left- and right-elliptically polarized and for linearly polarized light at several photon energies in the region of sigma(*) shape resonance. That allowed the determination of a set of dipole matrix elements and phase shift differences characterizing the process. These data clearly show the enhancement of the fsigma(u) partial cross section in the resonance simultaneously with an abrupt increase of the corresponding phase shift by pi, which is the first experimental demonstration of the nature of the sigma(*) shape resonance in homonuclear diatomic molecules.