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• W2080647232 abstract "An experimental study of the two-photon spectra of high members of the Sr I 5snd 1,3D2 Rydberg series is described. We use transverse excitation of an atomic beam with a narrow-bandwidth tuneable dye laser within a heat pipe equipped for field ionization detection. The presence of weak collisions has revealed several anomalies. Strong spin-orbit interaction and the breakdown of parity and selection rules combined with `l' mixing are observed. The breakdown is due to the Stark field present in the interaction region. Single-photon transitions originating from the 5snp 1P1 and 5snp3PJ states populated by electron impact excitations are also observed. They create highly compact doubly excited 4d23PJ, 5p21D2 and 4d5p 3PJ states, which act as dominant intruders in the observed spectrum. Such states with highly localized orbitals survive collision and field effects, whereas Rydberg states are highly sensitive to external perturbations. Also, we have observed l-changing collisional processes like Ar + Sr (5s}nd 1,3D2) → Sr (5snl,l⩾ 3). Several members of a new series which begin to appear at large n are observed and are tentatively designated as the 5snf 1F3 Rydberg series. Furthermore, we have observed and identified several members of the Sr I 5snp 1P1 and 5snp 3P2 Rydberg series by two-photon absorption from the ground state. They are excited via the breakdown of parity and other selection rules, owing to the presence of external fields. New values of energy levels of the Sr I 5snd 1,3D2 Rydberg series are presented: n=25-73 for singlet and n=25-47 for triplet members, obtained from two-photon spectra. Comparison of these values with those given by other authors who used different excitation schemes shows good agreement. The spectrum of fluorescence emission from a low-pressure discharge around the field ionization probe was obtained using a monochromator-photomultiplier detection system. The emission lines confirm the collisional excitations observed in the spectra of the Rydberg series. An energy level diagram summarizing the various transitions observed in our study is also presented." @default.
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• W2080647232 date "2001-02-12" @default.
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• W2080647232 title "TheJ= 2 even-parity spectrum for high members of the Sr I 5snd1,3D2Rydberg series in the presence of electric fields and weak collisions" @default.
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• W2080647232 doi "https://doi.org/10.1088/0953-4075/34/4/302" @default.
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