TY - JOUR
T1 - Vibrational spectroscopy of HD+ with 2-ppb accuracy
AU - Koelemeij, J. C J
AU - Roth, B.
AU - Wicht, A.
AU - Ernsting, I.
AU - Schiller, S.
PY - 2007/4/26
Y1 - 2007/4/26
N2 - By measurement of the frequency of a vibrational overtone transition in the molecular hydrogen ion HD+, we demonstrate the first optical spectroscopy of trapped molecular ions with submegahertz accuracy. We use a diode laser, locked to a stable frequency comb, to perform resonance-enhanced multiphoton dissociation spectroscopy on sympathetically cooled HD+ ions at 50 mK. The achieved 2-ppb relative accuracy is a factor of 150 higher than previous results for HD+, and the measured transition frequency agrees well with recent high-accuracy ab initio calculations, which include high-order quantum electrodynamic effects. We also show that our method bears potential for achieving considerably higher accuracy and may, if combined with slightly improved theoretical calculations, lead to a new and improved determination of the electron-proton mass ratio.
AB - By measurement of the frequency of a vibrational overtone transition in the molecular hydrogen ion HD+, we demonstrate the first optical spectroscopy of trapped molecular ions with submegahertz accuracy. We use a diode laser, locked to a stable frequency comb, to perform resonance-enhanced multiphoton dissociation spectroscopy on sympathetically cooled HD+ ions at 50 mK. The achieved 2-ppb relative accuracy is a factor of 150 higher than previous results for HD+, and the measured transition frequency agrees well with recent high-accuracy ab initio calculations, which include high-order quantum electrodynamic effects. We also show that our method bears potential for achieving considerably higher accuracy and may, if combined with slightly improved theoretical calculations, lead to a new and improved determination of the electron-proton mass ratio.
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U2 - 10.1103/PhysRevLett.98.173002
DO - 10.1103/PhysRevLett.98.173002
M3 - Article
AN - SCOPUS:34247647096
VL - 98
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 17
M1 - 173002
ER -