Coherent postionization dynamics of molecules based on adiabatic strong-field approximation

• URL: http://arxiv.org/abs/2311.11242v1
• Date: Sun, 19 Nov 2023 06:05:42 GMT
• Title: Coherent postionization dynamics of molecules based on adiabatic strong-field approximation
• Authors: Shan Xue, Wenli Yang, Ping Li, Yuxuan Zhang, Pengji Ding, Song-Feng Zhao, Hongchuan Du and Anh-Thu Le
• Abstract summary: We introduce a coherence injection model based on the adiabatic strong-field approximation (ASFA) We find that the ionization-induced coherence strongly enhances the population inversion of $X2 Sigma _g+ -B2 Sigma _u+ $ in N$+$ and the probability of O$+$.
• Score: 20.3515119922382
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Open-system density matrix methods typically employ incoherent population injection to investigate the postionization dynamics in strong laser fields. The presence of coherence injection has long been a subject of debate. In this context, we introduce a coherence injection model based on the adiabatic strong-field approximation (ASFA). This model effectively predicts ionic coherence resulting from directional tunnel ionization. With increasing field strength, the degree of coherence predicted by the ASFA model gradually deviates from that of the SFA model but remains much milder compared to the results of the simple and partial-wave expansion models. The impact of coherence injection on the postionization molecular dynamics is explored in O$_2$ and N$_2$. We find that the ionization-induced vibrational coherence strongly enhances the population inversion of $X^2 \Sigma _g^+ -B^2 \Sigma _u^+ $ in N$_2^+$ and the dissociation probability of O$_2^+$. Conversely, the ionization-induced vibronic coherences have inhibitory effects on the related transitions. These findings reveal the significance of including the vibronic-state-resolved coherence injection in simulating molecular dynamics following strong-field ionization.

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