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Characterization of the Observed Electric Field and Molecular Relaxation Times for Millimeter-Wave Chirped Pulse
G Dhont1, D Fontanari1, C Bray1
1LPCA, Université du Littoral Côte d'Opale, 189A avenue Maurice Schumann, 59140 Dunkerque, France.
Abstract:
In a chirped pulse experiment, the strength of the signal level is proportional to the amplitude of the electric field, which is weaker in the millimeter-wave or submillimeter-wave region than in the microwave region. Experiments in the millimeter region thus require an optimization of the coupling between the source and the molecular system and a method to estimate the amplitude of the electric field as seen by the molecular system. We have developed an analytical model capable of reproducing the coherent transient signals obtained with a millimeter-wave chirped pulse setup operated in a monochromatic pulse mode. The fit of the model against the experimental data allowed access to the amplitude of the electric field and, as a byproduct, to the molecular relaxation times T 1 and T 2.
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