A theoretical study on laser cooling of silicon monofluoride

Xia, Wensha; Fu, Mingkai; Ma, Haitao; Bian, Wensheng

doi:10.1016/j.chemphys.2017.01.007

Cited by 11 publications

(6 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should not be ignored that the spin-orbit coupling (SOC) effect may play an important role, especially for molecules involving heavy elements (Fu et al, 2016a;Fu et al, 2016b;Fu et al, 2017;Xia et al, 2017). Figure 3A and Figure 3B show the PECs including SOC for CaNC and SrNC, respectively.…”

Section: Potential Energy Curvesmentioning

confidence: 99%

Production of ultracold polyatomic molecules with strong polarity by laser cooling: A detailed theoretical study on CaNC and SrNC

Xia

Cao

et al. 2022

Front. Chem.

Self Cite

View full text Add to dashboard Cite

Laser cooling molecules to the ultracold regime is the prerequisite for many novel science and technologies. It is desirable to take advantage of theoretical approaches to explore polyatomic molecular candidates, which are capable of being cooled to the ultracold regime. In this work, we explore two polyatomic candidates, CaNC and SrNC, which are suitable for laser cooling. These molecules possess impressively large permanent dipole moments (∼6 Debye), which is preferred for applications using an external electric field. High-level ab initio calculations are carried out to reveal electronic structures of these molecules, and the calculated spectroscopic constants agree very well with the available experimental data. For each molecule, the Franck-Condon factor matrix is calculated and shows a diagonal distribution. The radiative lifetimes for CaNC and SrNC are estimated to be 15.5 and 15.8 ns, respectively. Based upon the features of various electronic states and by choosing suitable spin-orbit states, we construct two feasible laser cooling schemes for the two molecules, each of which allows scattering nearly 10000 photons for direct laser cooling. These indicate that CaNC and SrNC are excellent ultracold polyatomic candidates with strong polarity.

show abstract

Section: Potential Energy Curvesmentioning

confidence: 99%

Production of ultracold polyatomic molecules with strong polarity by laser cooling: A detailed theoretical study on CaNC and SrNC

Xia

Cao

et al. 2022

Front. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, they did not consider the effect of electronic state crossing. According to previous investigations (Fu et al, 2017;Xia et al, 2017), the SOC effects are important for laser cooling molecules and will be taken into account in this work. There have not been theoretical studies reported on laser cooling of GeH, SnH, and PbH.…”

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.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…It should be mentioned that, if cryogenic buffer-gas precooling is used, the number of photons required to reach the Doppler limit could be reduced up to nearly two orders of magnitude. [54][55][56][57] In addition, the applications of superconducting magnets and Sisyphus cooling can significantly reduce the required number of laser cooling cycles, making it a very useful complement to the Doppler laser cooling. 58,59 For example, recent work has demonstrated that, under Sisyphus conditions, the temperature of YbOH is reduced from B20 mK to o 600 mK with B500 photons scattered per 59 highlighting the efficiency of the Sisyphus cooling.…”

Section: Laser Cooling Schemes Constructed For Ash and Sbh Using Spec...mentioning

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.

Self Cite

View full text Add to dashboard Cite

show abstract

A theoretical study on laser cooling of silicon monofluoride

Cited by 11 publications

References 49 publications

Production of ultracold polyatomic molecules with strong polarity by laser cooling: A detailed theoretical study on CaNC and SrNC

Production of ultracold polyatomic molecules with strong polarity by laser cooling: A detailed theoretical study on CaNC and SrNC

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

Contact Info

Product

Resources

About