���t���N�g�����^���ʕ��͌v��p���āAMg⁺�ƃA�Z�g�j�g����(CH₃CN)����Ȃ�N���X�^�[Mg⁺(CH₃CN)_n�̌��𗣂��ϑ������Bn=1�ł͉𗣌�(355,266nm)�Ǝ˂ɂ���āAMg⁺�̃t���O�����g�C�I�����ϑ����ꂽ�BMg⁺(CH₃CN)�͂����̌���Mg⁺��3²P��3²S�ɑ�������J�ڂ��N�����āA�𗣂���ƍl������Bn��2�ɂ‚��Ă��A�𗣃X�y�N�g���̑���ƃt���O�����g�C�I���̓�����s���A���̉𗣉ߒ����c�_����B

Photodissociation spectroscopy of Mg⁺(CH₃CN)_n has been studied in a reflectron time-of-flight mass spectrometer. In the case of n=1, Mg⁺ fragment ion was efficiently observed at dissociation wavelengths of 355 and 266 nm. By absorption of these photons, Mg⁺(CH₃CN) is excited to the state originated from Mg⁺ 3²P. Moreover, photodissociation spectra and fragmentation pathways for n��2 will be discussed.