H. Rottke et al., SHORT-PULSE MPI OF XENON - THE P-2(1 2) IONIZATION CHANNEL/, Journal of physics. B, Atomic molecular and optical physics, 29(8), 1996, pp. 1479-1487
We present photoelectron spectra measured by 'short' pulse (tau(p) sim
ilar or equal to 0.7 ps) MPI of xenon at 526.5 nm excitation wavelengt
h in the intensity range 10(13) to 3 x 10(14) W cm(-2). Ionization int
o Xe+ P-2(3/2) and P-2(1/2) channels is observed and resonance structu
res are found in both ionization channels. They are induced by the AC
Stark shift of bound Xe states within the light pulse which brings the
m into transient n-photon resonance with the Xe ground state. The reso
nant states are tentatively identified as d- and s-angular momentum st
ates having AC Stark shifts which differ from the shift of the xenon i
onization threshold. In the high-intensity limit, ionization into the
Xe+ P-2(1/2) channel is completely suppressed.