����t����CCl₂F₂�iR-12�j����ё�փt����CF₃CHF₂�iR-125�j�̕��q���^�t�[���G�ϊ��}�C�N���g�������s���A�����q�̕��q�萔������l���啝�ɉ��P���邱�Ƃ��o�����BR-12�ł͉��f�j����уt�b�f�j�ɂ�钴���׍\�����ϑ����ꂽ�B�܂��AR-125�Ɋւ��Ă͏��߂�CF₃��̓�����]�o�����[V₃�����肷�邱�Ƃ��o�����B�{�������ʂƑ��̃t�����ގ����q�̑��茋�ʂƂ��r��������\��ł���B

The rotational spectra of CCl₂F₂(R-12) and CF₃CHF₂(R-125), members of freon, have been observed in 4-18 GHz region with a molecular beam Fourier transform spectrometer. Molecular constants of each molecule are improved. Moreover, the nuclear quadrupole coupling constants of R-12 and the barrier of internal rotation potential of CF₃ group of R-125 have been determined.