Abstract
The desorption dynamics of tetracene ion ([tetracene]+) from tetracene-doped anthracene (TDA) crystals in which efficient energy transfer from anthracene to tetracene occurs was investigated by means of femtosecond time-resolved mass spectrometry. Using a 400 nm pump pulse, anthracene molecules in TDA crystals are initially excited to the S1 state. After a certain delay (<10 ps) of pumping, the excitation energy in the S1 anthracene is transferred to a tetracene molecule to produce the S1 state. Tetracene in the S1 state is then ionized by a time-delayed probe pulse (266 nm) and desorbed tetracene ions from the crystals are monitored with a time-of-flight mass spectrometer. On the time-resolved mass spectra, the peak intensity of the tetracene ions shows a gradual increase with increasing delay time. The rise time constant of tetracene ion, which is considered to the desorption time from the crystals, was determined to be 80.8 and 94.7 ps for TDA crystals with anthracene/tetracene concentration ratios of ...
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