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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > April  >
In the Laboratory
Advanced Chemistry Classroom and Laboratory
Two-Photon Ionization Spectrometry of Alkali Atoms in Flames
Matthew G. Comstock, Jeffrey R. Kerr, and Jeffrey A. Gray
Department of Chemistry, Ohio Northern University, Ada, OH 45810
Cover
April 2002
Vol. 79 No. 4
p. 500
Abstract
We describe a new nonlinear optical spectrometry experiment suitable for advanced undergraduate or first-year graduate teaching laboratories. A tunable, nanosecond pulsed laser beam resonantly excites lithium or sodium atoms in a flame, and the resulting ion pulse is quantitatively detected using the optogalvanic effect. Signals exhibit saturation effects including line broadening and a nonlinear dependence on laser pulse intensity. We discuss ionization mechanisms, optical selection rules, and quantitative analysis involved with multiphoton spectrometry.
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Notes for instructors and a handout for students are available.
*  Contents JCE2002p0500W.doc (Microsoft Word)
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More Information
*  Citation
 Comstock, Matthew G.; Kerr, Jeffrey R.; Gray, Jeffrey A. J. Chem. Educ. 2002 79 500.
*  Keywords
 Analytical Chemistry; Atomic Spectroscopy; Excited States / Energy Transfer; Instrumental Methods; Laboratory Instruction; Lasers / Laser Spectroscopy
*  History
 Created:
Last Updated:		 March 1, 2002
March 16, 2005
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