A NEW RELAXATION EFFECT IN MICROWAVE SPECTROSCOPY
Creators:Harrington, Howard W.
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Publisher:Ohio State University
It is well known that a pure-rotational absorption line is split in the presence of a DC electric field. The M-degeneracy of the zero-field rotational energy level is lifted by the electric field due to the Stark effect. This paper presents experimental results comparing the time required for the M-states associated respectively with the upper and lower rotational energy levels of a zero-field transition to relax to the appropriate M-degenerate level after removal of the Stark field. The evidence indicates a non-equivalent relaxation time. In addition, the results suggest that more time is required to re-establish M-degeneracy after the Stark field is removed than that required to lift this degeneracy by application of the Stark field. The experiment utilizes the fact that the radiation absorption rate is proportional to the population concentration difference between the energy levels of any transition. The Stark modulation period was used as the time base.
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