Translational cooling and storage of protonated proteins in an ion trap at subkelvin temperatures

Details Translational cooling and storage of protonated proteins in an ion trap at subkelvin temperatures Translational cooling and storage of protonated proteins in an ion trap at subkelvin temperatures

2008-10-28

arxiv.org/abs/0810.5102v2

Phys. Rev. A 78, 061401(R) (2008)

Physics

Atomic Physics

same version as published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.78.061401

Gas-phase multiply charged proteins have been sympathetically cooled to translational temperatures below 1 K by Coulomb interaction with laser-cooled barium ions in a linear ion trap. In one case, an ensemble of 53 cytochrome c molecules (mass ~ 12390 amu, charge +17 e) was cooled by ~ 160 laser-cooled barium ions to less than 0.75 K. Storage times of more than 20 minutes have been observed and could easily be extended to more than an hour. The technique is applicable to a wide variety of complex molecules.

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