The cross section for the photoejection of a proton from a hydride molecule is derived using the Born approximation for hν>>I, and using the long-wavelength approximation for hν~=1, where ν is the frequency of the incident photon and I is the ionization potential of the proton. The cross section is negligible in the high-energy case. Near threshold, the probability for one photon being adsorbed in a path length of 1 cm is τ=1.4×102ρN12Z2Mνbν0bν0ν-νc+(b- 1)ν0(6N+5)3f2N where ρ is the density M is the molecular weight, Z is the orbital exponent of the Slater function describing the proton, b is a number between 1 and 2, N is the principal quantum number of the proton, hν0=I, and hνc is the kinetic energy of the center of mass plus the kinetic energy of the relative coordinate in the direction of the motion of the center of mass. The coefficient fN oscillates as N increases. For the range in N considered (88-125), fN varies from a minimum of 7.793 at N=103 to a maximum of 175.4 at N=115 beyond which it decreases again. Since N is large, τ is large only near threshold.