Emission and absorption ofγradiation by nuclei in molecules interacting with a light field

In the present work, probabilities of emission (absorption) of nuclear $\gamma$ radiation in molecules are calculated. In this process, molecular vibrations are excited and deexcited because of recoil of the nucleus. For vibrationally excited molecules, the existence of vibrational satellite shift is opposite in sign, and it allows compensation for the misalignment of the absorption and emission lines. The parameters (width, intensity, sign) of narrow frequency-tuned resonances of $\gamma$ radiation with the molecules excited by laser emission in a low-pressure gas are calculated. The contributions of vibrational anharmonicity and rotation-vibration interaction are discussed.