Alternating gradient focusing and deceleration of large molecules

Details Alternating gradient focusing and deceleration of large molecules Alternating gradient focusing and deceleration of large molecules

2008-03-05

arxiv.org/abs/0803.0650v1

Phys. Rev. A 77(3), 031404(R) (2008)

Physics

Atomic Physics

5 pages, 4 figures, revtex4

Scientific paper

10.1103/PhysRevA.77.031404

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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