We investigate theoretically the imprints of light-induced potentials (LIPs) on the dissociation dynamics of ${\mathrm{O}}_2{}^{+}$ molecular ions, as observable in angle-resolved fragment kinetic-energy-release (KER) spectra. Following the vibrational and rotational dynamics of the initial pump-laser-excited cationic nuclear wave packet, while accounting for the dipole coupling between the ${\mathrm{O}}_2{}^{+}\left(a{}^4{\mathrm{\Pi }}_u\right)$ and ${\mathrm{O}}_2{}^{+}\left(f{}^4{\mathrm{\Pi }}_g\right)$ electronic states in 800-nm 40-fs probe-laser pulses with peak intensities between ${10}^{13}$ and ${10}^{14} \mathrm{W}/{\mathrm{cm}}^2$, we calculate angle-resolved KER spectra which reveal characteristic energy- and angle-dependent fringe structures. These fringes shift downward in energy as the molecular alignment angle $\theta$ relative to the probe-pulse polarization direction increases from 0 to $\pi /2$. The angle-dependent shifts in the KER fringes increase for larger probe-pulse peak intensities and follow the angle and light-wave-intensity dependence of the vibrational spectrum in the associated Floquet bond-hardening well, which is a manifestation of transient ${\mathrm{O}}_2{}^{+}$ nuclear-probability trapping in the LIP during dissociation. By examining the rovibrational dynamics of the dissociating molecular cation near the light-induced conical intersection (LICI) in the cationic LIP surface at $\theta =\pi /2$, we identify related angle-dependent structures in the KER spectra, suggesting a means for assessing the significance of LICIs in molecular dissociation pathways.

中文翻译：

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O2 +强场解离中光诱导势的表征

我们在理论上研究光致电势（LIPs）的解离动力学的烙印 ${\mathrm{Ø}}_2{}^{+}$角分辨片段动能释放（KER）光谱中可以观察到的分子离子 遵循初始泵激激光激发的阳离子核波包的振动和旋转动力学，同时考虑了两者之间的偶极耦合${\mathrm{Ø}}_2{}^{+}（\mathrm{一种}{}^4{\mathrm{\Pi }}_{ü}）$ 和 ${\mathrm{Ø}}_2{}^{+}（F{}^4{\mathrm{\Pi }}_G）$ 800-nm 40-fs探测激光脉冲中的电子态，其峰值强度在 ${10}^{13}$ 和 ${10}^{14} \mathrm{w\; ^}/{\mathrm{厘米}}^2$，我们计算了角度分辨的KER光谱，揭示了特征性的依赖于能量和角度的条纹结构。这些条纹的能量随着分子排列角向下移动$\theta$ 相对于探测脉冲的极化方向从0增加到 $\pi /2$。对于较大的探测脉冲峰值强度，KER条纹中与角度相关的位移会增加，并且在相关的Floquet键硬化井中遵循振动光谱的角度和光波强度相关性，这是瞬态的一种表现。${\mathrm{Ø}}_2{}^{+}$解离过程中LIP中的核概率陷阱。通过检查阳离子LIP表面上光诱导圆锥形交叉点（LICI）附近解离的分子阳离子的旋转动力学$\theta =\pi /2$，我们确定了KER光谱中相关的角度依赖性结构，这表明了一种评估LICIs在分子解离途径中的意义的方法。