The low-lying electronic states of BeI: Accounting for spin–orbit effects on the energetic profile characterization and molecular properties

We present the ab initio study of spin-orbit coupling effects on laser cooling of BeI and MgI molecules. Potential energy curves for the X(2)Σ(+)(1/2), A(2)Π(1/2,3/2), and 2(2)Π(3/2,1/2) states are calculated using multi-reference configuration interaction method plus Davidson corrections. Spectroscopic parameters of BeI and MgI are in excellent agreement with available experimental and theoretical values. The A(2)Π(3/2) state of MgI is a repulsive state. It is an unsuitable scheme for the A(2)Π(3/2)(υ')← X(2)Σ(+)(1/2) (υ″) transition for laser cooling of MgI. Highly diagonally distributed Franck-Condon factors f00 for the A(2)Π(1/2,3/2) (υ' = 0) ← X(2)Σ(+)(1/2) (υ″ = 0) transitions and suitable radiative lifetimes τ for the A(2)Π(1/2,3/2) (υ' = 0) of BeI and MgI are obtained. Three laser wavelength drives are required for the A(2)Π(1/2,3/2)(υ')←X(2)Σ(+)(1/2) (υ″) transitions of BeI and MgI. The proposed cooling wavelengths of BeI and MgI are both in the violet region. The results imply the feasibility of laser cooling of BeI and MgI, and that laser cooling of BeI is more possible.

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Effects of spin-orbit coupling on laser cooling of BeI and MgI

Wan

Huang

Shao

et al. 2015

The Journal of Chemical Physics

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Extensive theoretical study on electronically excited states of calcium monochloride: Molecular laser cooling and production of ultracold chlorine atoms

Cao

et al. 2016

The Journal of Chemical Physics

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Nine doublet Λ-S states of calcium monochloride (CaCl) are calculated using the internally contracted multireference configuration interaction method with the Davidson correction. Both the core subvalence and spin-orbit coupling effects are taken into account. Laser cooling of CaCl and production of ultracold chlorine atoms are investigated and assessed. Our computed spectroscopic constants and radiative lifetimes match the available experimental data very well. The determined Franck-Condon factors and vibrational branching ratios of the A(2)Π1/2(ν('))←X(2)Σ1/2 (+)(ν) transition are highly diagonally distributed and the evaluated radiative lifetime for the A(2)Π1/2(ν' = 0) state is 28.2 ns, which is short enough for rapid laser cooling. Subsequently, detection of cold molecules via resonance enhanced multiphoton ionization to determine the final quantum state populations is discussed and the ionization energy calculated. A multi-pulse excitation scheme is proposed for producing ultracold chlorine atoms from zero-energy photodissociation of the cooled CaCl. Our results demonstrate the possibility of producing ultracold CaCl molecules and Cl atoms.

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RETRACTED: Research on the Application of Cloud Accounting in Government Accounting under the Background of Big Data

2021

J. Phys.: Conf. Ser.

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In the era of big data, cloud computing and big accounting data are combined to build a cloud accounting application platform that mainly integrates spatial distribution, security, accessibility, and the importance of transforming the state of accounting information. In the face of the wave of economic development, cloud accounting will also begin to be applied to administrative agencies and show great vitality in these departments. On this basis, this article focuses on the application of cloud accounting in government accounting under the background of big data. This article attempts to analyze the characteristics of cloud accounting to explore its functions and application services. In the new requirements of the new government accounting system, the importance of “big data” in the implementation of the new government accounting system is systematically analyzed. The use of cloud accounting in the government compares the settings and levels of the application with traditional government accounting work. The research results show that the emergence of cloud accounting is a major change in the accounting industry. It improves production efficiency and reduces company costs, and is favored by units. But cloud computing has some disadvantages. In today’s digital age, how to make cloud accounting a foothold takes a long time to think about how to make cloud accounting seize opportunities and respond to challenges.

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The low-lying electronic states of BeI: Accounting for spin–orbit effects on the energetic profile characterization and molecular properties

Cited by 3 publications

References 26 publications

Effects of spin-orbit coupling on laser cooling of BeI and MgI

Effects of spin-orbit coupling on laser cooling of BeI and MgI

Extensive theoretical study on electronically excited states of calcium monochloride: Molecular laser cooling and production of ultracold chlorine atoms

RETRACTED: Research on the Application of Cloud Accounting in Government Accounting under the Background of Big Data

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