24 June 2005
Vol 308, Issue 5730

About The Cover

Cover image expansion

COVER Molecular-beam flame sampling. A flat flame (blue) from a sintered metal burner (bottom) produces gases that are sampled through a small aperture in a quartz cone. These gases can then be analyzed by synchrotron-photoionization mass spectrometry, which has revealed previously undetected combustion intermediates. See page 1887. [Photo: Sandia National Laboratories]