Laser cooling of copper monofluoride: a theoretical study including spin–orbit coupling

Fu, Mingkai; Cao, Jianwei; Ma, Haitao; Bian, Wensheng

doi:10.1039/c6ra07835d

Cited by 10 publications

(4 citation statements)

References 71 publications

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“…So far only a few molecules including SrF, CaF, and YO have been cooled to the ultracold temperature experimentally, and there is an urgent need to search for more suitable molecular candidates for laser cooling. Recently, a number of theoretical efforts have been made in searching for promising molecular laser cooling candidates (Wells and Lane, 2011a;Fu et al, 2016a;Cao et al, 2019;González-Sánchez et al, 2019;Xu et al, 2019). It is generally accepted (Di Rosa, 2004;Fu et al, 2016b) that, a suitable laser-cooling candidate must meet the following three criteria: highly diagonal Franck-Condon factors (FCFs), a short lifetime, and no intermediate electronic-state interference.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Study on Laser Cooling Feasibility of Group IVA Hydrides XH (X = Si, Ge, Sn, and Pb): The Role of Electronic State Crossing

et al. 2020

Front. Chem.

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The feasibility of direct laser cooling of SiH, GeH, SnH, and PbH is investigated and assessed based upon first principles. The internally contracted multi-reference configuration interaction method with the Davidson correction is applied. Very good agreement is obtained between our computed spectroscopic constants and the available experimental data. We find that the locations of crossing point between the B 2 − and A 2 states have the tendency of moving downwards from CH to SnH relative to the bottom of the corresponding A 2 potential, which precludes the laser cooling of GeH, SnH, and PbH. By including the spin-orbit coupling effects and on the basis of the A 2 5/2 →X 2 3/2 transition, we propose a feasible laser cooling scheme for SiH using three lasers with wavelengths varying from 400 to 500 nm, which features a very large vibrational branching ratio (0.9954) and a very short radiative lifetime (575 ns). Moreover, similar studies are extended to carbon monosulfide (CS) with a feasible laser cooling scheme proposed. The importance of electronic state crossing in molecular laser cooling is underscored, and our work suggests useful caveats to the choice of promising candidates for producing ultracold molecules.

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Section: Introductionmentioning

confidence: 99%

A Theoretical Study on Laser Cooling Feasibility of Group IVA Hydrides XH (X = Si, Ge, Sn, and Pb): The Role of Electronic State Crossing

et al. 2020

Front. Chem.

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“…Radiative lifetimes of the same order of magnitude are also reported for other laser cooling candidates, such as CH 51,52 and CuF. 50 Moreover, the Doppler and recoil temperatures for the main cooling transition of AsH are 4.18 and 2.20 μK, respectively, and the corresponding values of SbH are 4.33 and 1.13 μK.…”

Section: Resultsmentioning

confidence: 53%

“…S3 (ESI†). Since the relative strengths of the photon loss pathways are more directly related to the vibrational branching ratios ( R ν ′ ν ) than f ν ′ ν in the laser cooling cycle, 50 we need to further check R ν ′ ν of the A 3 Π → X 3 Σ − transition. The Einstein A coefficients ( A ν ′ ν ) and R ν ′ ν of the A 3 Π 2 → X 3 Σ − 1 transition for AsH and SbH are calculated and presented in Tables 3 and 4, respectively.…”

Section: Resultsmentioning

confidence: 99%

A theoretical study on laser cooling feasibility of XH (X = As, Sb and Bi): effects of intersystem crossings and spin–orbit couplings

Cao

et al. 2022

Phys. Chem. Chem. Phys.

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“…The reason is that the relation between the relative strengths of the vibrational branching ratios and that between photon loss pathways are more direct than FCFs in the cooling cycle. [50][51][52] Thus, the cooling cycle with branching ratio R v v , which can be calculated by using the ratio of Einstein coefficients A v v for each vibronic transition, is expressed as…”

Section: Laser Cooling Of Chmentioning

confidence: 99%

Laser cooling of CH molecule: Insights from ab initio study

Cui¹,

Xu²,

Qi³

et al. 2018

Chinese Phys. B

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The feasibility of laser cooling a CH molecule is investigated theoretically by employing the ab initio method. The potential energy curves for the five Λ-S states and eight Ω states of CH are determined by the multi-reference configuration interaction with the Davidson corrections (MRCI+Q) level of theory. The results agree well with the available experimental data and other theoretical values. Also, the permanent dipole moments and transition dipole moments of the CH molecule are calculated at the multi-reference configuration interaction (MRCI) level. We find highly diagonally distributed Franck-Condon factors ( f 00 = 0.9950 and 0.9998) and branching ratios (R 00 = 0.983 and 0.993) for the A 2 ∆ → X 2 Π and C 2 Σ + → X 2 Π transitions. Moreover, the values of suitable radiative lifetime τ of the A 2 ∆ and C 2 Σ + states are evaluated to be 9.64×10 −7 s and 2.02×10 −7 s, respectively, for rapid laser cooling. A scheme for laser cooling the CH molecule is designed. In the proposed cooling scheme, three wavelengths for A 2 ∆ → X 2 Π and C 2 Σ + → X 2 Π transitions are used, and the main pump lasers are λ 00 = 430.86 nm and 313.45 nm, respectively. The feasibility of laser cooling the CH molecules is demonstrated for each of these schemes, and this study offers a theoretical basis for experimental research into preparation of cold CH molecules.

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Laser cooling of copper monofluoride: a theoretical study including spin–orbit coupling

Abstract: A laser cooling scheme is proposed for CuF by including the spin–orbit coupling effects, and based on our calculated radiative lifetimes and vibrational branching ratios.

Cited by 10 publications

References 71 publications

A Theoretical Study on Laser Cooling Feasibility of Group IVA Hydrides XH (X = Si, Ge, Sn, and Pb): The Role of Electronic State Crossing

A Theoretical Study on Laser Cooling Feasibility of Group IVA Hydrides XH (X = Si, Ge, Sn, and Pb): The Role of Electronic State Crossing

A theoretical study on laser cooling feasibility of XH (X = As, Sb and Bi): effects of intersystem crossings and spin–orbit couplings

Laser cooling of CH molecule: Insights from ab initio study

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