Optoacoustic detection of Doppler-free two-photon resonances in the v2 bands of NH3 |
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| Authors: | P. Minguzzi S. Profeti M. Tonelli A. Di Lieto |
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| Affiliation: | Istituto di Fisica dell''Università Pisa, Italy;Scuola Normale Superiore, Pisa, Italy |
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| Abstract: | A new approach to infrared two-photon spectroscopy is described. An optoacoustic cell operating at low pressure is used to detect Doppler-free transitions excited by a conventional and a waveguide CO2 laser. Beams from the two lasers are passed through the sample in opposite directions and an electric field tunes the transitions into resonance by molecular Stark effect. A few examples are discussed to illustrate the features and the sensitivity of the method. |
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