Rubidium peroxide
Rubidium peroxide is rubidium's peroxide with the chemical formula Rb2O2. Production 
Rubidium peroxide can be produced by rapidly oxidizing rubidium in liquid ammonia at −50°C. It can also produced by pyrolysis of rubidium superoxide in vacuum. Properties 
Rubidium peroxide is a colourless to light yellow solid with the orthorhombic crystal structure. References 

Rubidium compounds
Peroxides