Rapid-adiabatic-passage control of ro-vibrational populations in polyatomic molecules

Zak, Emil J.

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https://hdl.handle.net/2142/96841 Copy

Description

Title

Rapid-adiabatic-passage control of ro-vibrational populations in polyatomic molecules

Author(s)

Zak, Emil J.

Contributor(s)

Yachmenev, Andrey

Issue Date

2017-06-21

Keyword(s)

Chirality-sensitive spectroscopy

Abstract

We present a simple method for control of ro-vibrational populations in polyatomic molecules in the presence of inhomogeneous electric fields [1]._x000d_ Cooling and trapping of heavy polar polyatomic molecules has become one of the frontier goals in high-resolution molecular spectroscopy, especially in the context of parity violation measurement in chiral compounds [2]. A key step toward reaching this goal would be development of a robust and efficient protocol for control of populations of ro-vibrational states in polyatomic, often floppy molecules. Here we demonstrate a modification of the stark-chirped rapid-adiabatic-passage technique (SCRAP) [3], designed for achieving high levels of control of ro-vibrational populations over a selected region in space. The new method employs inhomogeneous electric fields to generate space- and time- controlled Stark-shifts of energy levels in molecules. Adiabatic passage between ro-vibrational states is enabled by the pump pulse, which raises the value of the Rabi frequency. _x000d_ This Stark-chirped population transfer can be used in manipulation of population differences between high-field-seeking and low-field-seeking states of molecules in the Stark decelerator [4]. Appropriate timing of voltages on electric rods located along the decelerator combined with a single pump laser renders our method as potentially more efficient than traditional Stark decelerator techniques. Simulations for NH$_3$ show significant improvement in effectiveness of cooling, with respect to the standard 'moving-potential' method [5]. At the same time a high phase-space acceptance of the molecular packet is maintained. _x000d_ _x000d_ {footnotesize_x000d_ begingroup_x000d_ renewcommand{section}[2]{}%_x000d_ %renewcommand{chapter}[2]{}% for other classes_x000d_ begin{thebibliography}{}_x000d_ _x000d_ bibitem{zak17} E.~J. Zak, A. Yachmenev (submitted)._x000d_ bibitem{melanie} C. Medcraft, R. Wolf, M. Schnell, Angew. Chem. Int. Ed., 53, 43, 11656--11659 (2014)_x000d_ bibitem{scrap} M. Oberst, H. Munch, T. Halfman, PRL 99, 173001 (2007)._x000d_ bibitem{kupper} K. Wohlfart, F. Grätz, F. Filsinger, H. Haak, G. Meijer, J. Küpper, Phys. Rev. A 77, 031404(R) (2008)._x000d_ bibitem{bethlem} H. ~L. Bethlem, F. ~M. ~H. Crompvoets, R. ~T. Jongma, S. ~Y. ~T. van de Meerakker, G. Meijer, Phys. Rev. A, 65, 053416 (2002)._x000d_ _x000d_ end{thebibliography}_x000d_ endgroup}

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/96841

DOI

https://doi.org/10.15278/isms.2017.WG06

Copyright and License Information

Copyright 2017 Emil J. Zak

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