Laser-induced reactions between a Ca+ Coulomb crystal and polar molecules
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We have studied laser-induced reactions between a Ca+ Coulomb crystal and the polar molecules of NH3 and ND3 at room temperature. The reaction rates of Ca+*(3d2D 3/2, 4p2P1/2) + NH3 (ND3) products have been determined from time variation of the size of fluorescence images of Ca+ Coulomb crystals. The results show that the reaction rates are very slow, and therefore the reaction-rate measurements between sympathetically cooled molecular ions and slow NH3 (ND 3) molecules can be performed using a Ca+ Coulomb crystal as coolant.