Rubidium chloride is primarily used in scientific research, particularly in the field of biochemistry and molecular biology. It serves as a source of rubidium ions in experiments studying ion transport mechanisms in cells and membranes. Additionally, it is utilized in the preparation of specialty glasses and ceramics, where it enhances certain optical properties. In medicine, rubidium chloride has been explored for its potential use in positron emission tomography (PET) scanning, as rubidium-82, a radioactive isotope, can act as a tracer for blood flow in the heart. It also finds application in the production of catalysts for organic synthesis and in the manufacturing of certain types of electronic components.