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
J. Chem. Educ., 2002, 79 (4), p 500
DOI: 10.1021/ed079p500
Publication Date (Web): April 1, 2002
History, Education, and Documentation

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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Feature):

Advanced Chemistry Classroom and Laboratory

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Atomic Spectroscopy
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  • Received: August 03, 2009

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