Abstract.
We theoretically investigated the mass dependence of the sympathetic cooling rate of gas-phase ions trapped in a linear radio-frequency-quadrupole ion trap. Using an a priori molecular dynamical calculation, tracing numerically with Newtonian equations of motion, we found that ions with a mass greater than 0.54±0.04 times that of the laser-cooled ions are sympathetically cooled; otherwise, they are heated. To understand the mass dependence obtained using the molecular-dynamical calculation, we made a heat-exchange model of sympathetic cooling, which shows that the factor of 0.54±0.04 is a consequence of absence of micro-motion along the axis of the linear ion trap.
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Received: 10 December 2001 / Revised version: 28 January 2002 / Published online: 14 March 2002
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Baba, T., Waki, I. Sympathetic cooling rate of gas-phase ions in a radio-frequency-quadrupole ion trap . Appl Phys B 74, 375–382 (2002). https://doi.org/10.1007/s003400200829
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DOI: https://doi.org/10.1007/s003400200829