Doubly Excited Autoionizing Rydberg States of Sr

Abstract

Phys" Rev. BJL4, 4808 (1976). 14 M 9 Cross, Phys. Rev. B jj5, 602 (1977). 15 ln Refo 5 there is an indication of the third peak but of a fractional intensity -2x 10" 3 0 The authors attribute it to possible pre-target molecular dissociation.We report the observation of doubly excited autoionizing Rydberg states of Sr, belonging to the configuration 5p 1 / 2 ,nh Gur procedure involves a three-step optical excitation process which incorporates Stark switching to reach higher I states not normally accessible because of dipole selection rules. Quantum defects are reported for several 5/> 1 / 2 , ns and 5pi/ 2 9 nd states. The lifetimes of the 5p 1^29 ns states are shown to scale as (n*) 3 , and the lifetimes of the 5p l / 2f 16/ states are shown to increase dramatically with increasing I

Imaging the evolution of an ultracold strontium Rydberg gas

“…For atoms excited to low-Rydberg states, such as the 5s48s 1 S 0 and 5s47d 1 D 2 states, core excitation leads to autoionization of the Rydberg atom through electron-electron scattering on a time scale on the order of the classical electron orbital period, ∼19 ps at n ∼ 50 [30,55]. This results in extreme broadening of the core transition compared to a bare ion.…”

“…The presence of a second valence electron leaves an optically active core after excitation of the Rydberg electron that can be used to further manipulate the Rydberg atom, such as through optical trapping [26] or for optical imaging [27]. The second electron also admits the possibility of creating doubly excited planetary atoms [28,29] or autoionizing states [30] that can serve as probes of the evolution of the Rydberg electron [31]. Furthermore, the presence of singlet and triplet excited states allows the study of both attractive and repulsive Rydberg-Rydberg interactions within a single element [32].…”

4pnp J =0 e -2 e autoionizing series of calcium: experimental and theoretical analysis

“…In this paper we present the spectroscopic study of the even parity autoionizing states, 4pnp, in Ca employing the Isolated Core Excitation (ICE) technique [6] along with a theoretical interpretation of the spectra based on the application of the R-matrix MQDT method [7]. The ICE technique relies on the excitation with a laser beam of one of the valence electrons to a bound Rydberg state, whereby a second laser beam excites the inner valence electron, while the Rydberg one remains essentially a spectator.…”

A study on odd-parity high-lying states of the Sm atom with three-color resonant excitation

“…In other words, the autoionization spectra are dominated by the configuration interaction rather than by a combination of configuration interaction and interference. The phenomenon infers that the observed autoionization spectra are similar to those obtained from the isolated core excitation [18], which has been proven to be an advanced excitation scheme in studying spectra of autoionizing states [19][20]. Table 2 The odd-parity autoionizing Rydberg states of the Sm atom obtained by paths I and II.…”