Abstract: A sample cell including a sample space, restricted on its first side by a first inner side of a first membrane and on its second side by a second inner side of a second membrane. A spacer is arranged between the first and the second inner sides to establish a distance between the membranes. A first retaining element is arranged on a first outer side, facing away from the sample space, of the first membrane and a second retaining element is arranged on a second outer side, which faces away from the sample space, of the second membrane, the first and second retaining elements together form a retaining structure. The first and second retaining elements each have a plurality of apertures aligned with each other in a direction transverse to the flat sides, to form a plurality of examination windows, in which the outer sides of the membranes are exposed.