RgH (Rg represents the rare gases) molecules are different from the commonhydrides, becasue its ground state is repulsive, but its excited state is bound. So it isexpected to be used as the producer of laser, of which the frequency can be adjusted RgH (Rg represents the rare gases) molecules are different from the commonhydrides, becasue its ground state is repulsive, but its excited state is bound. So it is expected to be used as the producer of laser, of which the frequency can be adjusted