Laser Scheme for Doppler Cooling of the Hydroxyl Cation (OH$^+$)
- URL: http://arxiv.org/abs/2308.14729v1
- Date: Mon, 28 Aug 2023 17:32:44 GMT
- Title: Laser Scheme for Doppler Cooling of the Hydroxyl Cation (OH$^+$)
- Authors: Niccol\`o Bigagli, Daniel W. Savin, Sebastian Will
- Abstract summary: We report on a cycling scheme for Doppler cooling of trapped OH$+$ ions using transitions between the electronic ground state $X3Sigma-$ and the first excited triplet state $A3Pi$.
We have found that coupling into other electronic states is strongly suppressed, and have calculated the number of photon scatterings required to cool OH$+$ to a temperature where Raman sideband cooling can take over.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We report on a cycling scheme for Doppler cooling of trapped OH$^+$ ions
using transitions between the electronic ground state $X^3\Sigma^-$ and the
first excited triplet state $A^3\Pi$. We have identified relevant transitions
for photon cycling and repumping, have found that coupling into other
electronic states is strongly suppressed, and have calculated the number of
photon scatterings required to cool OH$^+$ to a temperature where Raman
sideband cooling can take over. In contrast to the standard approach, where
molecular ions are sympathetically cooled, our scheme does not require
co-trapping of another species and opens the door to the creation of pure
samples of cold molecular ions with potential applications in quantum
information, quantum chemistry, and astrochemistry. The laser cooling scheme
identified for OH$^+$ is efficient despite the absence of near-diagonal
Franck-Condon factors, suggesting that broader classes of molecules and
molecular ions are amenable to laser cooling than commonly assumed.
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