A modified SCRAP technique using the decelerator's time-varying dc electric field as the chirp can achieve >99.5% population inversion between weak-field- and strong-field-seeking states of ammonia, improving Stark deceleration efficiency.
Optoelectrical cooling of polar molecules to sub-millikelvin temperatures
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abstract
We demonstrate direct cooling of gaseous formaldehyde (H2CO) to the microkelvin regime. Our approach, optoelectrical Sisyphus cooling, provides a simple dissipative cooling method applicable to electrically trapped dipolar molecules. By reducing the temperature by three orders of magnitude and increasing the phase-space density by a factor of ~$10^4$ we generate an ensemble of $3\cdot10^5$ molecules with a temperature of about 420\mu K, populating a single rotational state with more than 80% purity.
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Controlling rovibrational state populations of polar molecules in inhomogeneous electric fields of the Stark deceleration: molecular dynamics and quantum chemistry simulations
A modified SCRAP technique using the decelerator's time-varying dc electric field as the chirp can achieve >99.5% population inversion between weak-field- and strong-field-seeking states of ammonia, improving Stark deceleration efficiency.