The validity of classical trajectory and perturbative quantal methods for electron-impact ionization from excited states in H-like ions

نویسندگان

  • D C Griffin
  • C P Ballance
  • M S Pindzola
  • F Robicheaux
  • S D Loch
  • J A Ludlow
  • M C Witthoeft
  • J Colgan
  • C J Fontes
  • D R Schultz
چکیده

To test the validity of classical trajectory and perturbative quantal methods for electron-impact ionization of H-like ions from excited states, we have performed advanced close-coupling calculations of ionization from excited states in H, Li2+ and B4+ using the R-matrix with pseudo states and the timedependent close-coupling methods. Comparisons with our classical trajectory Monte Carlo (CTMC) and distorted-wave (DW) calculations show that the CTMC method is more accurate than the DW method for H, but does not improve with n and grows substantially worse with Z, while the DW method improves with Z and grows worse with n. (Some figures in this article are in colour only in the electronic version)

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Electron-impact ionization of highly excited hydrogenlike ions in a collinear s-wave model

We report results from collinear time-dependent close-coupling TDCC , distorted-wave DW , and R matrix with pseudostates calculations for the electron-impact ionization of H-like ions up to Z=6 within an s-wave model. We compare the results of these calculations with those from a collinear classical trajectory Monte Carlo calculation to investigate the correspondence between the quantal and cla...

متن کامل

1 9 D ec 2 00 6 Electron - impact ionization of the metastable excited

Electron-impact ionization cross sections for the 1s2s 1 S and 1s2s 3 S metastable states of Li + are calculated using both perturbative distorted-wave and non-perturbative close-coupling methods. Term-resolved distorted-wave calculations are found to be approximately 15% above term-resolved R-matrix with pseudostates calculations. On the other hand, configuration-average time-dependent close-c...

متن کامل

Ionization due to the interaction between two Rydberg atoms

Using a classical trajectory Monte Carlo method, we have computed the ionization resulting from the interaction between two cold Rydberg atoms. We focus on the products resulting from close interaction between two highly excited atoms. We give information on the distribution of ejected electron energies, the distribution of internal atom energies and the velocity distribution of the atoms and i...

متن کامل

Ejected-energy differential cross sections for the electron-impact detachment of H-

Electron-impact detachment cross sections for H− are calculated using time-dependent close-coupling theory. The three-electron wavefunction is expanded in terms of a product of a frozen core 1s hydrogenic wavefunction and a correlated two-electron wavefunction which fully describes the ejected and scattered electrons at all times following the collision. Ejected-energy differential and total in...

متن کامل

Plasma screening within Rydberg atoms in circular states

A Rydberg atom embedded in a plasma can experience penetration by slowly moving electrons within its volume. The original pure Coulomb potential must now be replaced by a screened Coulomb potential which contains either a screening length Rs or a screening factor A = R −1 s . For any given discrete energy level, there is a Critical Screening Factor (CSF) Ac beyond which the energy level disappe...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2005