No abstract

Experimental evidence is presented for confinement resonances associated with photoabsorption by a Xe atom in a C60 cage. The giant 4d resonance in photoionization of Xe is predicted to be redistributed into four components due to multipath interference of photoelectron waves reflected by the cage. The measurements were made in the photon energy range 60-150 eV by merging a beam of synchrotron radiation with a mass/charge selected Xe@C₆₀+ ion beam. The phenomenon was observed in the Xe@C(58)(3+) product ion channel. [corrected]

High-resolution photoabsorption spectra of CO B.lld NO below the 0 Is ionization threshold are presented. For both molecules, the vibrational finestructure of the 0 ls-t 'II"• a.nd 0 ls-1 Ryd (Rydberg) excitations could be resolved, allowing a derivation of the vibrational energies and intra.moleculal' distances of the core-excitation states in CO and NO from Ftanck-Condon analyses. The spectral features of the 0 ~s-1 Ryd region in CO are reassigned on the basis of the new experimental results. The results obtained for the 0 ls-1 3s Rydberg state in NO support the idea of a WP.akt>.nihg of the molecular bond upon an 0 15-J. ionization process.

This Letter was published online on 15 November 2010 with a tagging error in the abstract. The last sentence of the abstract should read as ''The phenomenon was observed in the Xe@C 3þ 58 product ion channel.'' The

We have investigated L-shell photoionization (PI) of 1S ground-state and 3Po metastable states of the Be-like ion, B+, in the photon energy range 22.4–31.3 eV, at an experimental energy resolution of 25 meV. Absolute PI cross sections have been measured using a photon–ion merged-beams arrangement at the Advanced Light Source. Detailed calculations using the semi-relativistic Breit–Pauli R-matrix approach suggest a fraction of 29% of metastable ions in the primary beam of the experiment. Excellent agreement is observed between the theoretical predictions and the experimental high-resolution PI cross sections. The present results are compared with earlier experimental and theoretical work. The cross section for PI of B+ ground-state ions can be very well described by an analytic formula derived from quantum defect theory.