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Journal Article

Alternating-Gradient Focusing of the Benzonitrile-Argon Van der Waals Complex

MPS-Authors
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Putzke,  Stephan
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Filsinger,  Frank
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Meijer,  Gerard
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Fulltext (public)

1208.3188v1.pdf
(Preprint), 754KB

1.4748814.pdf
(Publisher version), 2MB

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Citation

Putzke, S., Filsinger, F., Küpper, J., & Meijer, G. (in press). Alternating-Gradient Focusing of the Benzonitrile-Argon Van der Waals Complex. Journal of Chemical Physics, 137(10): 104310. doi:10.1063/1.4748814.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-E6DB-3
Abstract
We report on the focusing and guiding of the van der Waals complex formed between benzonitrile molecules (C₆H₅CN) and argon atoms in a cold molecular beam using an ac electric quadrupole guide. The distribution of quantum states in the guided beam is non-thermal, because the transmission efficiency depends on the state-dependent effective dipole moment in the applied electric fields. At a specific ac frequency, however, the excitation spectrum can be described by a thermal distribution at a rotational temperature of 0.8 K. From the observed transmission characteristics and a combination of trajectory and Stark-energy calculations we conclude that the permanent electric dipole moment of benzonitrile remains unchanged upon the attachment of the argon atom to within ±5%. By exploiting the different dipole-moment-to-mass ( µ/m) ratios of the complex and the benzonitrile monomer, transmission can be selectively suppressed for or, in the limit of 0 K rotational temperature, restricted to the complex.