In this paper we propose a new theoretical model for describing the formation of ultracold heteronuclear RbCs molecules in excited rovibrational states of the electronic ground state $X^1{\mathrm{\Sigma }}^{+}$ from combination of ultracold Rb and Cs atoms. A new scheme of association assisted by an electric field, that we call electro-association (EA), is proposed. Temperature dependent formation rates of molecules were found equal to: $K_{\mathit{EA}}\approx {10}^{-12}$${\text{cm}}^3/s$ at $T\approx 0.1$mK, which can be compared to other formation rates of some heteronuclear bi-alkali molecules. This model presents a different technique to create cold molecules with efficiency comparable to the photo-association (PA) technique, which requires optical pulses.

在本文中，我们提出了一个新的理论模型，用于描述电子基态的激发振动态下超冷异核RbCs分子的形成。 $X^{\mathrm{1个}}{\mathrm{\Sigma }}^{+}$由超冷的Rb和Cs原子结合而成。提出了一种新的由电场辅助的缔合方案，我们称之为电缔合（EA）。发现分子的温度依赖性形成速率等于：${ķ}_{\mathit{EA}}\approx {10}^{--12}$${\text{厘米}}^3/s$ 在 $Ť\approx 0.1$mK，可以与某些异核双碱分子的其他形成速率进行比较。该模型提供了一种不同的技术来创建冷分子，其效率可与需要光脉冲的光缔合（PA）技术相媲美。