arXiv 0803.06502008-03-05physics.atom-phphysics.acc-phphysics.chem-ph

Alternating gradient focusing and deceleration of large molecules

Kirstin Wohlfart, Fabian Grätz, Frank Filsinger, Henrik Haak, Gerard Meijer, Jochen Küpper

备注：: 5 pages, 4 figures, revtex4
发表信息：: Phys. Rev. A 77(3), 031404(R) (2008)
DOI：: 10.1103/PhysRevA.77.031404

英文摘要：

We have focused and decelerated benzonitrile (C$_7$H$_5$N) molecules from a molecular beam, using an array of time-varying inhomogeneous electric fields in alternating gradient configuration. Benzonitrile is prototypical for large asymmetric top molecules that exhibit rich rotational structure and a high density of states. At the rotational temperature of 3.5 K in the pulsed molecular beam, many rotational states are populated. Benzonitrile molecules in their absolute ground state are decelerated from 320 m/s to 289 m/s, and similar changes in velocity are obtained for excited rotational states. All measurements agree well with the outcome of trajectory calculations. These experiments demonstrate that such large polyatomic molecules are amenable to the powerful method of Stark deceleration.

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