Abstract
The R-Matrix incorporating Time (RMT) method is a new method for solving the time-dependent Schroedinger equation for multi-electron atomic systems exposed to intense short-pulse laser light. We have employed the RMT method to investigate the time delay in the photoemission of an electron liberated from a 2p orbital in a neon atom with respect to one released from a 2s orbital following absorption of an attosecond XUV pulse. Time delays due to XUV pulses in the range 76-105 eV are presented. For an XUV pulse at the experimentally relevant 105.2 eV, we calculate the time delay to be 10.2 +/- 1.3 attoseconds, somewhat larger than estimated by other theoretical calculations, but still a factor two smaller than experiment. We repeated the calculation for a photon energy of 89.8 eV with a larger basis set capable of modelling correlated-electron dynamics within the neon atom and the residual Ne(+) ion. A time delay of 14.5 +/- 1.5 attoseconds was observed, compared to a 16.7 +/- 1.5 attosecond result using a single-configuration representation of the residual Ne(+) ion.
Highlights
The R-matrix incorporating time (RMT) method is a method developed recently for solving the time-dependent Schrodinger equation for multielectron atomic systems exposed to intense short-pulse laser light
We have recently developed an ab initio method for solving directly and accurately the time-dependent Schrodinger equation (TDSE) describing the detailed response of multielectron atoms and ions to short, intense pulses of laser light: the R-matrix incorporating time (RMT) method [8,9]
A central concept of the RMT method, namely, the matching of a finite-difference representation in one region with a basis set representation in the other, was first developed using the hydrogen atom as a testing ground [13]. In this Rapid Communication, we present an application of RMT to the time delay between photoemission from the 2s and 2p subshells of a neon atom
Summary
The R-matrix incorporating time (RMT) method is a method developed recently for solving the time-dependent Schrodinger equation for multielectron atomic systems exposed to intense short-pulse laser light. An attosecond streaking experiment investigated the time delay in photoemission of electrons liberated from the 2p orbitals of neon atoms with respect to those released from the 2s orbital by the same xuv light pulse [6]. We have recently developed an ab initio method for solving directly and accurately the TDSE describing the detailed response of multielectron atoms and ions to short, intense pulses of laser light: the R-matrix incorporating time (RMT) method [8,9].
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