Orientation of adsorbed molecules under the influence of electric fields

ABSTRACT

The dynamic orientation of vertically adsorbed polar molecules is investigated by switching on electric fields. The rotational properties of molecules are modulated by the electric field and the conical well. The orientation reveals multiple pronounced oscillations, depending on the specific field parameters. The range of oscillation is enhanced even in the presence of conical-well confinement. Furthermore, population concentration and inversion cyclically occur in the system, corresponding to distinctive molecular orientations. Specific field-free orientation is also obtained by turning off the field. The population can be concentrated or reversed for a long time. The thermal effect on the properties of orientation is analysed in detail.

Keywords:

• Orientation
• anticrossing
• population concentration and inversion

Disclosure statement

No potential conflict of interest was reported by the author.

Additional information

Funding

This work is supported by the Ministry of Science and Technology of Taiwan [grant number MOST 103-2112-M-390-003-MY3].