PN⁺�C�I����N₂⁺�C�I����P₂⁺�C�I���̒��Ԃ̐��������‚Ɗ��҂���Ă���A�܂����ԕ��q�̌��Ƃ��ċ������Ă��郊���������ł���B����܂ł̕����w�I�����ł́AB²Σ⁺-X²Σ⁺(0,0)�o���h�ȊO�̏ڍׂȕ����w�I�萔�͓����Ă��Ȃ������B����A�t�[���G�ϊ����O���������@��p����PN⁺�C�I����(1,0)�A(0,1)�o���h�𑪒肵�A�A���A��͂��s�Ȃ����̂ŕ񍐂���B

PN⁺ ion is expected to have an intermediate property between the N₂⁺ and P₂⁺ ions, and to be a candidate for the interstellar molecule. Accurate spectroscopic constants of PN+ ^{have been unknown except for the B}2^Σ+^-X2^Σ+^{(0,0) transition. The present report will describe observation and analyses of B}2^Σ+^-X2^Σ+(1,0) and (0,1) transitions by high resolution Fourier transform emission spectroscopy.