Matter-wave near-field interference can imprint a nano-scale fringe pattern onto a molecular beam. which allows observing its shifts in the presence of even very small external forces. Here we demonstrate quantum interference of the pre-vitamin 7-dehydrocholesterol and discuss the conceptual challenges of magnetic deflectometry in a near-field interferometer as a tool to explore photo... https://lecoureures.shop/product-category/ski-de-fond-junior-fixations/