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Physics World

Molecular condensate

Published Mar 1, 2000• 0 citations
Publisher

Abstract

The recent demonstrations of laser-like amplification of atomic beams by Bose-Einstein condensates, less than five years after the first condensates were created, shows just how rapid progress has been in this field (see page 24). Now physicists are attempting a repeat performance with molecules (R Wynar et al. 2000 Science287 1016).
DOI
10.1088/2058-7058/13/3/2

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In recent years, much progress has been made in producing and manipulating ultracold atoms in Bose-Einstein condensates (BECs). But, as Williams and Julienne explain in this Perspective, molecules are poor candidates for the laser cooling techniques commonly used to produce BECs. Many groups are trying to devise techniques for making ultracold molecules. A technique reported by Wynar et al. (page 1016) has allowed the first observation of molecule formation in a BEC, and may ultimately be able to produce a pure molecular condensate.
A group at the University of Texas at Austin has recently created Rb\-2 moleculaes from a Rubidium\|87 Bose\|Einstein condensate with two\|photon stimulated Raman transitions.The molecules are in a single ro\|vibrational level and have a temperature on the order of 100nK.These might be the coldest molecules in the universe,as says Paul Julienne,a senior atomic physicist at NIST.This method provides an alternative route for formation of ultra\|cold molecules which are still not achievable with the traditional laser cooling and trapping techniques,and may lead to the first realization of molecular Bose\|Einstein condensate.