title: Strong Optical Dipole Force Exerted on Molecules Having Low Rotational Temperature.
abstract: The optical dipole force acting on molecules is enhanced by decreasing the rotational temperature of the molecule and aligning the molecular axis with a linearly polarized nonresonant laser beam. The rotational temperature is decreased by increasing the source pressure from 2 to 81 bar. By using the effective polarizability directly pertaining to the optical dipole force, the force and the resulting change in the velocity of the molecules can be evaluated. Theoretical calculations are compared with measurements based on velocity map imaging techniques. If the rotational temperature is reduced from 295 to 1 K, the maximum alignment is increased from <cos2θ>=0.33 to 0.92, and the average optical force is enhanced by 74 %.
authors.affiliation: Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea.|Department of Chemistry, Yanbian University, Yanji, 133002, China.
authors.forename: Xing Nan
authors.initials: XN
authors.lastname: Sun
authors.affiliation: Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea.
authors.forename: Byung Gwun
authors.initials: BG
authors.lastname: Jin
authors.affiliation: Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea.
authors.forename: Lee Yeong
authors.initials: LY
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea.
authors.forename: Bong Jun
authors.initials: BJ
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea.|Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea.
authors.forename: Bum Suk
authors.identifier: http://orcid.org/0000-0003-0470-6396
authors.initials: BS
authors.lastname: Zhao
keywords: cold molecules; manipulation of molecules; molecular alignment; molecule optics; optical dipole force