Theoretical expressions are derived for the integrated absorption coefficients of various zero-phonon double transitions involving a homonuclear-heteronuclear pair of hydrogen molecules in condensed phase. The formulas given in this paper can be applied to transitions in the absorption spectra of solid parahydrogen (or orthodeuterium, or solid HD, HT, etc.) matrices that contain a low concentration of impurity molecules which do not possess a permanent dipole moment (e.g., ${\mathrm{N}}_2).\mathrm{}$

• Received 6 June 2003

DOI:https://doi.org/10.1103/PhysRevB.68.184303