Double autoionization of hollow-atom states
نویسندگان
چکیده
A time-dependent close-coupling method for three-electron atomic systems is formulated to calculate the double autoionization of hollow-atom states. Initial excited states are obtained by relaxation of the Schrödinger equation in imaginary time, while autoionization rates are obtained by propagation in real time. A 12-coupledchannels nonperturbative calculation on a three-dimensional radial lattice yields a double-autoionization rate for the Li 2s22p →Li2+ 1s +2e− transition that that is somewhat smaller than earlier many-body perturbation theory calculations and in reasonable agreement with rates extracted from resonance profiles found in more recent +Li experiments.
منابع مشابه
RESONANCE PARAMETERS OF AUTOIONIZING Be 2pnl STATES
While photoionization of helium has been studied thoroughly, beryllium (1s2s), the next helium-like atom in the periodic table, has been investigated only marginally by comparison. Double excitations in the Be valence-shell region have been studied experimentally as well as theoretically in the past. In these experiments [1,2] vacuum sparks were used to photo-excite and –ionize Be atoms and abs...
متن کاملInfluence of the helium autoionization structures on the single/double ionization signal
Calculations of intense field (around 10 W/cm) singleand double-ionization processes in helium at XUV wavelengths are presented. The laser wavelength is chosen near the |2s2p P〉 autoionization structure and the dynamics are explored. Single and double ionization yields, as well as the photoelectron energy spectrum for photon energies around the autoionization structure are calculated. In the ca...
متن کاملElectron-impact double ionization of beryllium
Time-dependent close-coupling, R-matrix double pseudo-states and distorted-wave methods are used to calculate the electron-impact double ionization cross section for the 1s22s2 ground state of the Be atom. At 1.5 times the double ionization threshold energy, the first two non-perturbative methods predict a cross section of approximately 1.0 × 10−18 cm2 for the direct double ionization of the 2s...
متن کاملSpin–orbit autoionization and intensities in the double‐resonant delayed pulsed‐ field threshold photoionization of HCl
Articles you may be interested in Double-resonance spectroscopy of autoionizing states of ammonia Photoselection and the structure of highly excited states: Rotationally resolved spin–orbit autoionization spectrum of HCl State-selected delayed pulsed-field threshold photoionization spectra of HCI and DCI are recorded in double-resonant transitions through the F lA, E lI+, and g 3I-states of the...
متن کاملExtensive electron-nuclear angular momentum exchange in vibrational autoionization of np and nf Rydberg states of NO.
Vibrational autoionization of individual rotational levels of np (n 1) and nf (n 1) Rydberg states of nitric oxide (NO) with 11 # n # 15 have been studied employing two-color double-resonance excitation via the NO A S1 (ni 1) state. The rotational state distributions of the resulting NO X S1 (n 0) ion have been determined by time-of-flight photoelectron spectroscopy. These measurements ...
متن کامل