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Quantum Electronics and Laser Science Conference

Measurement of /sup 85/Rb 27D lifetime using a sample of cold atoms

A.L. de Oliveira, R. Zanon, K. M. F. Magalhães, Luís Gustavo Marcassa

Published Jan 20, 2003• 0 citations
Publisher

Abstract

Summary form only given. In the late 1990s the idea of using trapped neutral atoms to produce cold Rydberg atoms has drawn special attention. Conventional techniques to study Rydberg atoms using thermal atoms have limitations imposed by velocity dependent and collisional effects. With the advent of the magneto-optical trap (MOT) cold samples of Rydberg atoms, which are naturally Doppler-free, can now be produced. In this work we present the measurement of /sup 80/Rb 27D Rydberg state by field ionization using trapped atoms.

DOI
10.1109/qels.1999.807317

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Summary form only given. In the late 1990s the idea of using trapped neutral atoms to produce cold Rydberg atoms has drawn special attention. Conventional techniques to study Rydberg atoms using thermal atoms have limitations imposed by velocity dependent and collisional effects. With the advent of the magneto-optical trap (MOT) cold samples of Rydberg atoms, which are naturally Doppler-free, can now be produced. In this work we present the measurement of /sup 80/Rb 27D Rydberg state by field ionization using trapped atoms.
In this paper, I review some recent high-precision Rydberg state lifetime measurements using a cold-trapped sample of neutral atoms held in a magneto-optical trap. The measurements were performed in rubidium for the S, P and D states varying the principal quantum number from n =26 to 45 using the field ionization technique. The experimental results were compared with quantum mechanical calculations and good agreement was observed. This is an important demonstration of how cold atomic samples can be used to perform high-precision spectroscopy in the time domain.
In this paper, we demonstrate the use of a cold trapped sample of neutral atoms to perform high-precision measurement of the lifetime for a sequence of Rydberg states of 85Rb.{}^{85}\mathrm{Rb}.85Rb. States of principal quantum number lying between n=31n=31n=31 and n=45n=45n=45 are produced and their lifetimes measured using field ionization. Experimental results are compared with existing theories. This is an important demonstration concerning the possibilities of high-precision spectroscopy in the time domain using cold atomic samples.
Summary form only given. Laser-cooled atoms can be excited into Rydberg states to study Rydberg gases at high densities and low atomic velocities. Dense clouds of such atoms undergo virtually complete ionization when their density exceeds a critical value dependent on the principal quantum number n. We report a new regime in which the excited Rydberg population spontaneously evolves into long-lived high-l states, the lifetimes of which exceed the natural lifetimes of the initially excited Rydberg levels by two orders of magnitude. /sup 87/Rb atoms are collected and cooled to 50 /spl mu/K in a magneto optical trap (MOT), which is periodically turned off for 50 ms. 1 ms after the shutdown of the MOT the Rydberg atoms are created via a two-step excitation process using a 5 /spl mu/s long diode laser pulse.
Summary form only given. We report on recent experimental and theoretical investigations of highly excited atoms prepared from a dense atomic sample in a magneto-optical trap (MOT). The goals of the work are two-fold. First, by exciting atoms above the ionization potential (IP) we can study the properties of an ultracold plasma of electrons (T<1 K) and ions (T<1 mK). Second, tuning the excitation below the IP, we can populate high-lying Rydberg states whose atomic radii are comparable to the interparticle spacing, possibly spawning new collective phenomena. In our initial experiments we study Rydberg states. We collect 10/sup 7/ /sup 85/Rb atoms in the MOT at a density of 10/sup 10//cm/sup 3/. Atoms in the 5s ground state are excited into Rydberg states using single photon excitation.
Summary form only given. Collisions with Rydberg atoms have been studied in depth both theoretically and experimentally in recent decades. One well-known collisional process involving two Rydberg atoms is called energy transfer collision, which has a unique characteristic, i.e., its cross-section can be tuned by a static electric field via the Stark effect. This collisional process has been studied with several alkalis, using thermal atoms deriving from an atomic beam. This thermal source, however, has some disadvantages. With the advent of the magneto-optical trap (MOT), cold samples of atoms can now be produced very simply. Several groups have recently succeeded in producing cold samples of Rydberg atoms in a MOT and have observed collisional processes. This achievement has opened up an entirely new field, in which several different experiments can be carried out. This paper reports, for the first time, on a time evolution experiment of energy transfer collisions using cold Rydberg atoms in a MOT.