Attosecond time delay in the photoionization of endohedral atomsA@C60: A probe of confinement resonances

P. C. Deshmukh, A. Mandal, S. Saha, A. S. Kheifets, V. K. Dolmatov, S. T. Manson
2014 Physical Review A. Atomic, Molecular, and Optical Physics  
The effects of confinement resonances on photoelectron group delay (Wigner time delay) following ionization of an atom encapsulated inside a C_60 cage have been studied theoretically using both relativistic and non-relativistic random phase approximations. The results indicate clearly the resonant character of the confinement oscillations in time delay of the 4d shell of Xe@C_60 and present a most direct manifestation of Wigner time delay. These oscillations were missed in a previous theoretical investigation of Ar@C_60 [PRL 111, 203003 (2013)]
doi:10.1103/physreva.89.053424 fatcat:fc6gq5yrtrcc7b3v4np5eluu7m