Molecular Fountain

C. Cheng, A.P.P. van der Poel, P. Jansen, M. Quintero Perez, T.E. Wall, W.M.G. Ubachs, H.L. Bethlem

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The resolution of any spectroscopic or interferometric experiment is ultimately limited by the total time a particle is interrogated. Here we demonstrate the first molecular fountain, a development which permits hitherto unattainably long interrogation times with molecules. In our experiments, ammonia molecules are decelerated and cooled using electric fields, launched upwards with a velocity between 1.4 and 1.9 m/s and observed as they fall back under gravity. A combination of quadrupole lenses and bunching elements is used to shape the beam such that it has a large position spread and a small velocity spread (corresponding to a transverse temperature of <10 μK and a longitudinal temperature of <1 μK) when the molecules are in free fall, while being strongly focused at the detection region. The molecules are in free fall for up to 266 ms, making it possible, in principle, to perform sub-Hz measurements in molecular systems and paving the way for stringent tests of fundamental physics theories.
Original languageEnglish
Article number253201
Number of pages5
JournalPhysical Review Letters
Volume117
Issue number25
DOIs
Publication statusPublished - 2016

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    Cheng, C., van der Poel, A. P. P., Jansen, P., Quintero Perez, M., Wall, T. E., Ubachs, W. M. G., & Bethlem, H. L. (2016). Molecular Fountain. Physical Review Letters, 117(25), [253201]. https://doi.org/10.1103/PhysRevLett.117.253201