Gas mixtures which comprise acids like HF, HCl or HBr and other constituents, especially gas mixtures which comprise or consist of carboxylic acid fluorides, CF2 or phosphorous pentafluoride and HCl and optionally HF, can be separated by ionic liquids. A disk-shaped cathode contained in a package can and a disk-shaped anode contained in a package cup are laminated with a separator in between. A signal is generated from the bar code format to simulate a reflection of a scanning beam being moved across a static visual image of the bar code format; and the signal is transmitted as light pulses from the mobile communications device. The first and second radiation-detection devices are operable to detect radiation waves that enter the substrate through the back side.