Mg $_2^+$电子基态的PFI-ZEKE光电子能谱学表征
Characterization of the electronic ground state of Mg$_2^+$ by PFI-ZEKE photoelectron spectroscopy
摘要：
用脉冲场电离零动能（PFI-ZEKE）光电子能谱学研究了MgPDMATHABMN离子的$\mathrm{X}^+\ ^2Σ_u^+$基电子态。在激光烧蚀超声膨胀源中产生的旋转冷Mg $_2$分子通过共振双光子吸收从$\mathrm{X}\ ^1Σ_g^+(v"=0)$基态电子振动态电离。的$v^+=3-14$振动水平的$\mathrm{X}^+$状态的光电子能谱记录与旋转分辨率和他们的分析导致这些水平的准确的长期值和旋转常数的测定。从实验数据确定了$^{24}$ Mg $_2$的绝热电离能（$51\,503.9(4)$ cm $^{-1}$）和$^{24}$ Mg $_2^+$的基态离解能（$10 572.3(6)$ cm $^{-1}$）的改进值。
英文摘要：
The $\mathrm{X}^+\ ^2Σ_u^+$ ground electronic state of the Mg$_2^+$ ion has been studied by pulsed-field-ionization zero-kinetic-energy (PFI-ZEKE) photoelectron spectroscopy. Rotationally cold Mg$_2$ molecules produced in a laser-ablation supersonic-expansion source were ionized by resonant two-photon absorption from the $\mathrm{X}\ ^1Σ_g^+(v"=0)$ ground vibronic state. The photoelectron spectra of the $v^+=3-14$ vibrational levels of the $\mathrm{X}^+$ state were recorded with rotational resolution and their analysis led to the determination of accurate term values and rotational constants for these levels. Improved values of the adiabatic ionization energy of $^{24}$Mg$_2$ ($51\,503.9(4)$ cm$^{-1}$) and of the ground-state dissociation energy of $^{24}$Mg$_2^+$ ($10 572.3(6)$ cm$^{-1}$) were determined from experimental data.
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