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Manipulating the motion of polar molecules with microwave radiation

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Merz,  Simon
Molecular Physics, Fritz Haber Institute, Max Planck Society;
Center for Free–Electron Laser Science;
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Societ;

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Brieger,  Claudia
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Vanhaecke,  Nicolas
Molecular Physics, Fritz Haber Institute, Max Planck Society;
Laboratoire Aimé Cotton, CNRS, Bâtiment 505 , Université Paris–Sud;

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Meijer,  Gerard
Molecular Physics, Fritz Haber Institute, Max Planck Society;
Radboud University Nijmegen , Institute for Molecules and Materials;

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Citation

Merz, S., Brieger, C., Vanhaecke, N., Meijer, G., & Schnell, M. (2013). Manipulating the motion of polar molecules with microwave radiation. Molecular Physics, 111(12-13), 1855-1864. doi:10.1080/00268976.2013.810791.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-BFF6-6
Abstract
Microwave radiation coupled into a cylindrically symmetric resonator is used to focus, guide, decelerate, and accelerate ammonia molecules in high-field-seeking states. In a first series of measurements, we demonstrate that the focal length of a microwave lens is directly proportional to the molecules’ velocity and to the inverse of the fourth root of the microwave power. In a second series of measurements employing a modified set-up, we use a multi-stage decelerator exploiting the TE1,1,12 mode of a cylindrical resonator and various switching schemes. We can deliberately choose between spatial focusing and velocity focusing while guiding, and we demonstrate kinetic energy reduction by as much as 30% of a 12 m/s slow packet of molecules utilising the 12 deceleration stages.