Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 154, Issue 5, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0039802
Keywords
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Funding
- National Key Research and Development Project of China [2019YFA0307700]
- National Natural Science Foundation of China [21573279, 21773299, 21327804]
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Through real-time tracking of the UV-light-triggered isomerization of propanal in the 3s Rydberg state, it was found that the conversion barrier is approximately 1500 +/- 100 cm(-1), and the photoisomerization yield and conversion rate depend strongly on the excitation energy.
Structure rearrangement processes, such as isomerization, are attracting extensive interest as a potential carrier in molecular scale electronics design. UV-light-triggered isomerization of Rydberg-excited propanal with two UV photons has been investigated with time-resolved photoelectron spectroscopy. By following the photoionization from 3s Rydberg states in the time domain, the ultrafast structural evolution and the corresponding photoisomerization dynamics are observed and tracked in real-time. The conversion barrier for isomerization from cis-propanal to gauche isomer is estimated to be about 1500 +/- 100 cm(-1) experimentally. Both the photoisomerization yield and the conversion rate have shown strong dependence on the excitation energy. It is observed that whether vibration modes are selectively excited or not, cis-to-gauche photoisomerization of propanal in 3s Rydberg state occurs once the excitation energy is higher than the conversion barrier without any vibrational excitation specificity. This yields a powerful approach to studying structural evolution dynamics in large molecules, which may have applications in molecular devices.
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