Phase Dependence of Double-Resonance Experiments in Rotational Spectroscopy

Schmitz, D.; Shubert, V. A.; Patterson, D.; Krin, A.; Schnell, M.

doi:10.1021/acs.jpclett.5b00494

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Phase Dependence of Double-Resonance Experiments in Rotational Spectroscopy

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Schmitz, D.
Structure and Dynamics of Cold and Controlled Molecules, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, Luruper Chaussee 149, D-22761 Hamburg, Germany;
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Shubert, V. A.
Structure and Dynamics of Cold and Controlled Molecules, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, Luruper Chaussee 149, D-22761 Hamburg, Germany;

/persons/resource/persons146333

Krin, A.
Structure and Dynamics of Cold and Controlled Molecules, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, Luruper Chaussee 149, D-22761 Hamburg, Germany;
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Schnell, M.
Structure and Dynamics of Cold and Controlled Molecules, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, Luruper Chaussee 149, D-22761 Hamburg, Germany;

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https://dx.doi.org/10.1021/acs.jpclett.5b00494
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jz5b00494_si_001.pdf
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Citation

Schmitz, D., Shubert, V. A., Patterson, D., Krin, A., & Schnell, M. (2015). Phase Dependence of Double-Resonance Experiments in Rotational Spectroscopy. The Journal of Physical Chemistry Letters, 6(8), 1493-1498. doi:10.1021/acs.jpclett.5b00494.

Cite as: https://hdl.handle.net/21.11116/0000-0007-1788-6

Abstract

We here report on double-resonance experiments using broadband chirped pulse Fourier transform microwave spectroscopy that can facilitate spectral assignment and yield information about weak transitions with high resolution and sensitivity. Using the diastereomers menthone and isomenthone, we investigate the dependence of pumping a radio frequency transition on both the amplitude and phase of the signal from a microwave transition with which it shares a common rotational level. We observe a strong phase change when scanning the radio frequency through molecular resonance. The direction of the phase change depends on the energy level arrangement, that is, if it is progressive or regressive. The experimental results can be simulated using the three-level optical Bloch equations and described with the AC Stark effect, giving rise to an Autler–Townes splitting.