25 May 2018
Vol 360, Issue 6391

About The Cover

Cover image expansion

COVER Apparatus for building a single NaCs molecule from two individual sodium and cesium atoms. The single chemical reaction takes place in an 80-millimeter-long glass cell vacuum chamber, where the atoms are captured and manipulated by laser beams focused through a microscope objective (shown at right). The reaction is triggered by a pulse of light after the atoms are brought together. See pages 855 and 900.
Photo: Ken Richardson