研究目的
To perform a high-resolution Fourier-transform spectroscopic study of the (4) 1Σ state of the RbCs molecule, including direct potential fitting and electronic structure calculations to understand perturbations and radiative properties.
研究成果
The study successfully derived the empirical potential energy curve for the (4) 1Σ state of RbCs, revealing perturbations and providing insights into radiative properties. The agreement between simulated and experimental intensity distributions validates the approach. The findings facilitate future use of this state in multistep laser-induced population transfer and highlight the need for more abundant spectroscopic data for comprehensive deperturbation.
研究不足
The study is limited by the fragmentary spectroscopic data available, which restricts comprehensive deperturbation analysis. Local perturbations and nonadiabatic interactions are not fully resolved due to data constraints. The accuracy of term value determination is about 0.003–0.005 cm?1, and the method may not capture all intramolecular interactions.
1：Experimental Design and Method Selection:
Two-step optical excitation using Ti:sapphire lasers to excite the (4) 1Σ state via an intermediate state, followed by observation of LIF spectra with a Fourier-transform spectrometer. The robust weighted nonlinear least-squares method is used for direct potential fitting, and electronic structure calculations are performed using ab initio methods.
2：Sample Selection and Data Sources:
RbCs molecules in a heat-pipe tube with rubidium and cesium metals, operating at 300°C with Ar buffer gas. Data include term values from LIF spectra for 85RbCs and 87RbCs isotopologues.
3：List of Experimental Equipment and Materials:
Ti:sapphire lasers (Coherent MBR110), Fourier-transform spectrometer (Bruker IFS 125HR), photomultiplier tube, InGaAs diode, heat-pipe tube, rubidium and cesium metals, Ar buffer gas.
4：Experimental Procedures and Operational Workflow:
Overlap two copropagating laser beams in the heat pipe, tune lasers to specific frequencies for excitation, record LIF spectra at 0.03 cm?1 resolution, detect signals in the range 10,000–22,000 cm?1, and analyze spectra for term values and perturbations.
5：03 cm?1 resolution, detect signals in the range 10,000–22,000 cm?1, and analyze spectra for term values and perturbations.
Data Analysis Methods:
5. Data Analysis Methods: Use of robust weighted nonlinear least-squares method for DPF, numerical solution of radial equations, comparison with ab initio calculations, and simulation of intensity distributions.
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