Resonance structures in the multichannel quantum-defect theory for the photofragmentation processes involving one closed and many open channels

The transformation introduced by Giusti-Suzor and Fano, and extended by Lecomte and Ueda, for the study of resonance structures in the multichannel quantum-defect theory (MQDT) is used to reformulate MQDT into the forms having one-to-one correspondence with those in Fano’s configuration mixing (CM) theory of resonance for the photofragmentation processes involving one closed and many open channels. The reformulation thus allows MQDT to have the full power of the CM theory, still keeping its own strengths such as the fundamental description of resonance phenomena without an assumption of the presence of a discrete state as in CM.