Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 107, Issue 4, Pages 1075-1085Publisher
SPRINGER
DOI: 10.1007/s00340-011-4802-y
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- Netherlands Organisation for Scientific Research (NWO)
- Ministry of Science and Technology of Iran
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We report the observation of the hitherto undetected v'=8a dagger v=0 vibrational overtone in trapped HD+ molecular ions, sympathetically cooled by laser-cooled Be+ ions. The overtone is excited using 782 nm laser radiation, after which HD+ ions in v=8 are photodissociated by the 313 nm laser used for Be+ cooling. The concomitant loss of HD+ is detected by the method of secular excitation (Roth et al. in Phys. Rev. A. 74:040501(R), 2006). We furthermore present details of the experimental setup, and we show that results from spectroscopy of v'=8a dagger v=0 overtones in combination with accurate ab initio calculations may yield a new value for the proton-electron mass ratio with an accuracy of order 1 ppb.
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