Cold heteromolecular dipolar collisions

Details Cold heteromolecular dipolar collisions Cold heteromolecular dipolar collisions

2010-08-30

arxiv.org/abs/1008.5127v1

Phys. Chem. Chem. Phys. 13, 19059-19066 (2011)

Physics

Chemical Physics

7 pages, 5 figures

Scientific paper

10.1039/C1CP21203F

We present the first experimental observation of cold collisions between two different species of neutral polar molecules, each prepared in a single internal quantum state. Combining for the first time the techniques of Stark deceleration, magnetic trapping, and cryogenic buffer gas cooling allows the enhancement of molecular interaction time by 10$^5$. This has enabled an absolute measurement of the total trap loss cross sections between OH and ND$_3$ at a mean collision energy of 3.6 cm$^{-1}$ (5 K). Due to the dipolar interaction, the total cross section increases upon application of an external polarizing electric field. Cross sections computed from \emph{ab initio} potential energy surfaces are in excellent agreement with the measured value at zero external electric field. The theory presented here represents the first such analysis of collisions between a $^2\Pi$ radical and a closed-shell polyatomic molecule.

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