Trapping polar molecules in an ac trap

Physical Review A - Atomic, Molecular, and Optical Physics

Volumn 74, Issue 6, 2006, Pages

  Bethlem, Hendrick L ^a,b   Van Veldhoven, Jacqueline ^a,c   Schnell, Melanie ^a   Meijer, Gerard ^a  

^a FRITZ HABER INSTITUT DER MAX PLANCK GESELLSCHAFT   (Germany)

^b VU UNIVERSITY AMSTERDAM   (Netherlands)

^c FOM INSTITUTE FOR PLASMA PHYSICS RIJNHUIZEN   (Netherlands)

Author keywords

[No Author keywords available]

Indexed keywords

COMPUTER SIMULATION; ELECTRIC FIELD EFFECTS; ELECTRODES; ELECTRON ENERGY LEVELS; MAXWELL EQUATIONS;

FREE SPACE; PHASE-SPACE VOLUME; POLAR MOLECULES; SPATIAL DISTRIBUTION;

MOLECULAR DYNAMICS;

EID: 33845241478     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.74.063403     Document Type: Article

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47. The three geometries presented in this section for trapping neutral atoms and molecules using time-varying electric fields all have their magnetic counterpart. A cylindrically symmetric magnetic ac trap was proposed for spin-polarized atomic hydrogen atoms by Lovelace, and later demonstrated for cesium atoms by Cornell.
48. Alternatively, one may apply a positive voltage to two neighbouring electrodes while the other two electrodes are kept at a negative voltage.
49. When ζ and ξ are chosen such that E =0 at the center of the trap, a hexapolar field results. An attempt to calculate F by using Eq. 2 fails due to the 1/E3 term. However, as the Stark effect of any molecule is quadratic in weak fields, we should use Eq. 3 instead. From Eq. 3 F=0 at the center of the trap. As both kx, ky and kz are equal to zero the trap volume is infinitely small.
50. Again, one may also apply a positive voltage to two neighbouring electrodes while the two electrodes in the same plane are kept at a negative voltage and the remaining two electrodes are at ground.
51. Even terms will cause the force to be nonzero at the center of the trap. Peik considered a small n =2 term to compensate the gravitational force on the atoms. In the case of polar molecules, the trap depth is so large that gravity can be neglected.