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Kr atoms were produced in their metastable states 4p55s [3/2]2 and 4p55s’ [1/2]0 in a pulsed DC dis-charge in a beam,and subsequently excited to the even-parity autoionizing Rydberg states 4p5np’ [3/2]1,2,[1/2]1 and 4p5nf’ [5/2]3 using single photon excitation.The excitation spectra of the even-parity autoionizing resonance series from the metastable Kr were obtained by recording the autoionized Kr+ ions with time-of-flight ion detection in the photon energy range of 29000-40000 cm1.A wealth of autoionizing resonances were newly observed,from which more precise and more systematic spec-troscopic data of the level energy and quantum defects were derived.
Kr atoms were produced in their metastable states 4p55s [3/2] 2 and 4p55s ’[1/2] 0 in a pulsed DC dis-charge in a beam, and subsequently excited to the even-parity autoionizing Rydberg states 4p5np’ [3 / 2] 1,2, [1/2] 1 and 4p5nf ’[5/2] 3 using single photon excitation. The excitation spectra of the even-parity autoionizing resonance series from the metastable Kr were obtained by recording the auto-regulated Kr + ions with time-of-flight ion detection in the photon energy range of 29000-40000 cm1.A wealth of autoionizing resonances were newly observed, from which more precise and more systematic spec-troscopic data of the level energy and quantum defects were derived.