Triplet-state dynamics in Chl-a/Per mixtures in organic solvent and in native H-PCP were studied by means of step-scan FTIR spectroscopy. A single decay component of 10 μs was observed for the H-PCP triplet, the spectrum of which closely matches the 13 μs component of A-PCP [Alexandre et al., Biophysical Journal 93 (2007) 2118–2128], implying that in H-PCP, as in A-PCP, the peridinin triplet state is shared with Chl-a. In a mixture of Chl-a and Per in THF, TEET from ³Chl-a to ³Per proceeds in 3.5 μs followed by ³Per decay in 7 μs. Using a target analysis procedure, ³Chl-a and ³Per infrared difference spectra were obtained. The specific carbonyl frequencies of ³Per and ³Chl-a in THF confirm our assignment of their co-existence in the infrared spectra of H-PCP and A-PCP.