Collison-Induced Optical Double Resonance II,
IBM RESEARCH LAB SAN JOSE CALIF
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We have demonstrated that a set of new resonances can accompany the conventional infrared Lamp-dip or double resonance transitions in CH3F gas. These satellite lines have a different origin from the primary resonances even though they are similar in intensity and line width. The traditional double resonance requires that a molecule interact simultaneously with two radiation fields, causing a transition from an initial to a final state through an intermediate level. Here, the double resonance concept is extended to the situation of two coherently driven optical transitions that do not share a common level but are coupled by molecular collisions that tip the angular momentum vector while preserving the molecular velocity and rotational energy. Thus, velocity selective population changes are communicated from one transition to another through collisions. Collision-induced double resonance is observed with Stark tuning as a series of sharp lines, free of Doppler broadening and can be explained in the same order of perturbation theory as the ordinary double resonance experiment. Each satellite corresponds to a specific level structure involving on or more collision-induced transitions among the space quantized M states. Virtually all characteristics of these satellite resonances, either in Lamb-dip or double resonance experiments, are in agreement with the theory presented.
- Atomic and Molecular Physics and Spectroscopy