�G�L�V�}�[���[�U�[(248nm)��p���ăV�A�����x���]�C���̑����q�𗣂��s���A��N���𗣐�����CN(B)���ϑ������B����CN(B)�͓���q�𗣐������ł���ƍl������BCN(B-X)0-0�o���h�̌u�����U�X�y�N�g���𑪒肵�V�~�����[�V������͂��s�����ɂ���āA������ԕ��z�����߁A�𗣉ߒ����l�@�����B�܂���o���I���q�O���@��p���āA���m�ł������V�A�����x���]�C���̔M�͊w�I�f�[�^���Z�o���ACN(B)�̒E���ɔ����𗣃G�l���M�[���Z�o�����B

a low-pressure flowing gas sample of benzyl cyanide (C₆H₅COCN) was photolyzed with excimerlaser(KrF) at 248 5nm, and fluorescence from the fragments, CN(B²��⁺) was observed. The vibrational and rotational distributions for the nascent CN(B²��⁺) were determined by the simulation analysis of the dispersed fluorescence spectra. Here, we discuss the dissosiation mechanisms of two-UV photon excited benzyl cyanide based on the internal energy distribution of the CN(B²��⁺) products.