Determination of natural radiative lifetimes and Land� factors for highly excitedF states in cesium

Abstract

Natural radiative lifetimes and Land6 gj factors for several highly excited F states in cesium were measured using time-resolved fluorescence spectroscopy. The F states were excited from the 5 2D5/2 state with a pulse-modulated CW dye laser, and the delayedcoincidence method was employed to record decay curves, which in some experiments exhibited Zeeman quantum beats. A further CW dye laser was used to produce the necessary population in the 5 2D5/2 state. The lifetimes in the sequence 11 16 2/]77/2 follow a n x scaling law with x=2.76 and the Land6 factors agree with the predicted value, 1.143.

Natural radiative lifetimes in the perturbed 6snd 1 D 2 sequence of barium

“…It has been experimentally verified, that the lifetimes in alkali atom sequences follow such an n* dependence with k sometimes deviating from 3 (see e.g. [11,24]). However, if a sequence is subject to perturbations as is the case for the two-electron sequence studied in the present investigation, deviations from this simple rule can occur.…”

“…Alternatively, the Zeeman quantum beat method can also be used in a way similar to what has been discussed in Ref. [11]. The optical double resonance method can be used for precision measurements.…”

“…The lifetimes of the short-lived perturber states 5d7d 3F 2 and 1D 2 were also measured as well as those of some 6snd aD 2 states in the region of strong perturbation. In the present measurements we have used the PUMOLS (PUlse MOdulated Laser Spectroscopy) technique, which incorporates pulse modulation of a CW dye-laser beam and delayed coincidence electronics I- [8][9][10][11]. This technique proved to be much more powerful than that employed in our preliminary measurements.…”

“…11. A green multi-mode CW dye laser operating with the dye Rhodamine 110 induced the 5,535A transitions from the ground state 6s 2 1S 0 to the intermediate 6s 6p 1P~ level, which has a lifetime of only 8 ns (see e.g.…”

Lifetime measurements for excited states of rare-earth atoms using pulse modulation of a cw dye-laser beam

“…The technique is applicable for the full wavelength region covered by cw dye lasers (presently 390-950 nm) and can be extended by using step-wise excitations, as has just been demonstrated in measurements of Dand F-state lifetimes in Cs. 34 The PUMOLS technique combines a high spectral resolution with very short measuring times. A limiting factor is the fall-time of the optical pulses used, which sets a lower limit to the lifetimes that can be directly measured.…”