Delayed fluorescence spectra of intact leaves photoexcited by sunlight measured with a multichannel Fourier-transform chemiluminescence spectrometer

- Delayed fluorescence spectra of intact leaves of Green pak choi were measured.
- A new multichannel Fourier-transform chemiluminescence spectrometer was used.
- The spectra were deconvoluted into two bands due to fluorescence of PS II and PS I.
- The wavelength of fluorescence maximum from PS I was determined to be 748 nm.