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Issue 40, 2017
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Laser cooling of the OH molecular anion in a theoretical investigation

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Abstract

The schemes for laser cooling of the OH anion are proposed using an ab initio method. Scalar relativistic corrections are considered using the Douglas–Kroll Hamilton. Spin–orbit coupling (SOC) effects are taken into account at the MRCI+Q level. SOC effects play important roles in the transition properties of the OH anion. Transition strengths for the Image ID:c7cp04393g-t1.gif transition of the OH anion cannot be ignored. Large vibrational branching ratios for the Image ID:c7cp04393g-t2.gif and Image ID:c7cp04393g-t3.gif transitions are determined. Short spontaneous radiative lifetimes for the a3Π1 and A1Π1 states are also predicted for rapid laser cooling. The vibrational branching loss ratio to the intervening states a3Π0 and a3Π1 for the Image ID:c7cp04393g-t4.gif transition is small enough to enable the building of a laser cooling project. The three required laser wavelengths for the Image ID:c7cp04393g-t5.gif and Image ID:c7cp04393g-t6.gif transitions are all in the visible region. The results imply the probability of laser cooling of the OH anion via both a spin-forbidden transition and a three-electronic-level transition.

Graphical abstract: Laser cooling of the OH− molecular anion in a theoretical investigation

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Publication details

The article was received on 30 Jun 2017, accepted on 18 Sep 2017 and first published on 18 Sep 2017


Article type: Paper
DOI: 10.1039/C7CP04393G
Citation: Phys. Chem. Chem. Phys., 2017,19, 27360-27367
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    Laser cooling of the OH molecular anion in a theoretical investigation

    M. Wan, D. Huang, Y. Yu and Y. Zhang, Phys. Chem. Chem. Phys., 2017, 19, 27360
    DOI: 10.1039/C7CP04393G

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