�U����N��Ԃ���̎��O��������p���邱�ƂŁA�����d���f�u�������A�����j�A��N-H�܂���N-D������I��I�ɉ𗣂����邱�Ƃ�ڎw���Ă���BN-H�����N-D�L�k��5ν�U����Ԃ���̌��𗣂̎������s�����B�����̓W�F�b�g���ōs���A�����𐶐�����H/D���A���‘����q�C�I������p���Č��o�����BN-H�U����N����NHD₂�ł́A����1�{�������N-H/N-D�𗣔䂪5�{���x�ł������̂ɑ΂��AN-D�U����N����NH₂D�ł�0 6�{���x�ł������B

A ratio of N-H/N-D bond dissociation was measured for UV photolysis of vibrationally excited NHD₂ and NH₂D. For NHD₂ in the N-H stretching state (5ν_N-H), N-H bond dissociation occurs with ca. 5 times higher efficiency than N-D dissociation. Whereas, excitation to the N-D stretching state (5ν_N-D) of NH₂D leads to preferential N-D bond dissociation with ca. 1. 6 times higher efficiency.