�ber den Durchgang bewegter Molek�le durch inhomogene Kraftfelder

Pure Samples of Individual Conformers: The Separation of Stereoisomers of Complex Molecules Using Electric Fields

“…[13,14] For neutral molecules, the abundance of the conformers in molecular beams can be partly influenced by selective over-the-barrier excitation in the early stage of the expansion [15] or by changing the carrier gas. [16] Herein, we demonstrate that electrostatic deflection, a classic molecular beam manipulation method that dates back to the 1920s, [17,18] allows the spatial separation of the conformers of a neutral molecule when it is applied to intense beams of rotationally cold molecules produced by a state-ofthe-art pulsed supersonic expansion source. [19] The idea of exploiting electrostatic deflection to separate quantum states was already conceived by Stern in 1926 for light diatomic molecules, [20] and these ideas were recently extended to proposals for the separation of conformers of large molecules.…”

Stark-selected beam of ground-state OCS molecules characterized by revivals of impulsive alignment

“…Alternatively, ultracold alkali atoms can be photoor magneto-associated and form ultracold homo-or heteronuclear diatomic molecules occupying a single electronic, vibrational and rotational state [19,20] including, in certain cases, the absolute ground state [21,22]. All methods offer unique opportunities but are also subjected to limitations in terms of the type of molecules that the methods apply to or the particular quantum states that can be selected.Here we demonstrate an alternative method, with a history reaching back to the 1920s [23][24][25], to produce molecules in a single quantum state. Like multipole focusing and Stark or Zeeman deceleration it is based on selecting the molecules that are initially residing in a specific quantum state.…”

Improved spatial separation of neutral molecules

“…Just a few years later, the deflection of molecules by an inhomogeneous electric field was demonstrated. 4,5 Various deflector shapes and techniques have evolved to optimize the process, [6][7][8][9] and an overview of various early experimentally employed deflection-field geometries was already presented in Ramsey's textbook on molecular beams. 10 Modern experiments typically employed geometries approximating two-wire fields.…”