Resonantly enhanced multiphoton-ionization photoelectron spectroscopy of krypton and xenon: Experiment and theory

Angular distributions for energy-resolved photoemitted electrons from resonantly enhanced multiphoton ionization (REMPI) via the two-photon allowed 6p[j=1/2${]}_{\mathit{J}=0\mathrm{}}$, 6p[3/2${]}_2$, 6p’[1/2${]}_0$, 6p’[3/2${]}_2$, 7p[1/2${]}_0$, 7p[3/2${]}_2$, and 7p[5/2${]}_2$ states and the three-photon allowed 7s[3/2${]}_1$, 8s[3/2${]}_1$, 9s[3/2${]}_1$, 5d[3/2${]}_1$, 5d’[5/2${]}_3$, and 5d’[3/2${]}_1$ states of xenon and the three-photon allowed 5s[3/2${]}_1$, 6s[3/2${]}_1$, 4d[3/2${]}_1$, 4d[5/2${]}_3$, and 4d[7/2${]}_3$ states of krypton are reported. In one case, two-photon resonant, three photon ionization [(2+1) REMPI] of the 6p’[1/2${]}_0$ state of xenon, a dramatic laser-power dependence (power ∼1.5×${10}^{10}$ to ∼3×${10}^{10}$ W/${\mathrm{cm}}^2$), was observed. The measured angular distributions for electrons leaving either ion core ${(}^2$ ${\mathit{P}}_{1/2}$ or ${}_{}{}^2{}_{}{}^{}$ ${\mathit{P}}_{3/2}$) are compared with those calculated from multichannel quantum-defect theory.