State-specific detection of trapped HfF${}^{+}$ by photodissociation

Abstract

We use (1+1${}^{\prime }$) resonance-enhanced multiphoton photodissociation (REMPD) to detect the population in individual rovibronic states of trapped HfF${}^{+}$ with a single-shot absolute efficiency of 18%, which is over 200 times better than that obtained with fluorescence detection. The first photon excites a specific rotational level to an intermediate vibronic band at 35,000-36,500 cm${}^{-1}$, and the second photon, at 37,594 cm${}^{-1}$ (266 nm), dissociates HfF${}^{+}$ into Hf${}^{+}$ and F. Mass-resolved time-of-flight ion detection then yields the number of state-selectively dissociated ions. Using this method, we observe rotational-state heating of trapped HfF${}^{+}$ ions from collisions with neutral Ar atoms. Furthermore, we measure the lifetime of the ${}^3{\Delta }_1$ $v=0,J=1$ state to be 2.1(2) s. This state will be used for a search for a permanent electric dipole moment of the electron.

4 pages, 5 figures

References in corpus (3)

• Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron
• Precision Spectroscopy of Polarized Molecules in an Ion Trap
• Broadband velocity modulation spectroscopy of HfF^+: towards a measurement of the electron electric dipole moment

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