We demonstrate experimentally the Doppler cooling of ^(40)Ca^(+) ions using the S_(1/2)→D_(3/2) electric quadrupole transition,in which the scattering light that is much different from the exciting light makes it possible to collect background-free fluorescence.The idea excluding 397 nm excitation has the advantage of high-sensitivity detection and only employs lasers in red and infrared wavelengths,which should be practical for trapped-ion quantum information processing.
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机译：Hybrid quadrupole mass filter/quadrupole ion trap/time-of-flight-mass spectrometer for infrared multiple photon dissociation spectroscopy of mass-selected ions
