Standard Article

Direct Analysis in Real-Time Ion Source

Mass Spectrometry

  1. Robert B. Cody,
  2. A. John Dane

Published Online: 15 DEC 2010

DOI: 10.1002/9780470027318.a9012

Encyclopedia of Analytical Chemistry

Encyclopedia of Analytical Chemistry

How to Cite

Cody, R. B. and John Dane, A. 2010. Direct Analysis in Real-Time Ion Source. Encyclopedia of Analytical Chemistry. .

Author Information

  1. JEOL USA, Inc., Peabody, MA, USA

Publication History

  1. Published Online: 15 DEC 2010


Direct Analysis in Real Time (DARTTM) refers to an atmospheric-pressure “open-air” ion source that is based on the interaction of long-lived (“metastable”) excited-state neutral atoms or molecules with analytes and atmospheric gases. The DART source is used for the rapid analysis of liquids, solids, vapors, or materials on surfaces in open air with little or no sample preparation.


  • mass spectrometer;
  • mass spectrometry;
  • ion source;
  • ionization;
  • direct analysis;
  • ambient ionization;
  • open-air ionization;
  • atmospheric pressure ionization;
  • atmospheric pressure ion source