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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