Transition rate dependence on the improved turning point in ADK-theory
✍ Scribed by V. M. Ristić; J. M. Stevanović; M. M. Radulović
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 86 KB
- Volume
- 3
- Category
- Article
- ISSN
- 1612-2011
No coin nor oath required. For personal study only.
✦ Synopsis
Estimation of transition rate of ionization of atoms
for short range potential, based on assumptions of Keldysh
approximation, shows that short-range potential does not affect
the energy of the final state of ejected electron, when it leaves
the atom. Coulomb potential is then treated as perturbation of
final state energy leading to the ADK-theory. But Coulomb
interaction was not originally included in calculating the turning
point. This we corrected in [1], though only for fields with
intensities below those of the atomic field. But as the ADK-theory
was recently extended to the case of superstrong fields, our
calculations now include extension of potential range up to
10^17^ W/cm^2^; this leads to the shift of position of the
turning point τ, which then influences transition rates for
atoms in the low-frequency electromagnetic field of superstrong
lasers. On Figs. 1 and 2 obtained from our calculations the value
of Z was switched from 1 to 10 at field intensity of 5 × 10^13^ W/cm^2^ (atomic unit system), which is done for the
first time ever. The second figure also indicates an enormous
activity at fields 10^13^ W/cm^2^, which is due to strong
tunneling effect for this energies of laser field. After that,
there is saturation at a very low level of transition rate for
fields from 10^15^ W/cm^2^ to 10^17^ W/cm^2^.