Fig. 1: Experimental geometry and orbital contributions.
From: Ultrafast electron energy-dependent delocalization dynamics in germanium selenide

a The geometry of the sample and incident x-ray in our experiment; the horizontal polarized light (purple arrows) excites the pz orbitals preferentially. b Calculated Ge pz orbital contribution in GeSe band structure. c Calculated Se pz orbital contribution in GeSe band structure. The colorbar indicates the weight of pz contribution in the states.