Popis: |
The field ionization thresholds of Stark states of Sr atoms for n=17, |m|=0, 1 manifolds are investigated. The thresholds are also calculated by introducing a Stark-effective quantum number ns which is derived from the experimental Stark map of Sr. The agreement between experimental and calculated results is quite good. This study showed, contrary to the hydrogen's, higher-energy states generally have lower ionization thresholds, and that the |m|=0, 1 Sr atoms exhibit partly adiabatic behavior at several avoided crossings in the passage to ionization. |