The present study investigates the impact of a droplet onto a deep pool of immiscible liquid for a wide range of drop impact Froude numbers (10 $\le$ Fr $\le$ 1075) to characterize the crater and jet dynamics. The radial expansion of the crater is followed by contraction of its sidewalls before the inception of vertical retraction at low drop impact Froude numbers (Fr $\le$ 400), whereas the gravity-induced buoyant force of displaced liquid resulted in the simultaneous horizontal and vertical retraction of deeper cavities at high Froude numbers (Fr $>$ 400). Four different jet regimes such as short jet, singular jet, slender jet, and compound thin thick jet are observed and their formation is associated with specific flow behaviors around the retracting crater. The short, singular, and slender jets are observed when retraction of the crater is capillary dominant. The compound thin thick jets are mainly attributed to gravity dominant deeper cavities.

本研究调查了液滴对大范围的液滴撞击Froude数（10 $\le$ r $\le$1075）来表征火山口和射流动力学。弹坑的径向膨胀之后，其侧壁收缩，然后在低落冲击弗洛德数（Fr$\le$ 400），而在较高的弗洛德数（Fr $>$400）。观察到四种不同的射流形态，例如短射流，奇异射流，细长射流和复合的薄厚射流，它们的形成与缩回弹坑周围的特定流动行为有关。当缩孔是毛细管主导时，观察到短，奇异和细长的射流。复合的薄而厚的射流主要归因于重力主导的较深的空洞。