Optomechanical switching of adsorption configurations of polar organic molecules by UV radiation pressure
Papadopoulos, Theodoros A.
Tang, Shu-Jung; email: email@example.com
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AbstractAbstract: Using photoemission spectroscopy (PES), we have systematically investigated the behavior of polar organic molecule, chloroaluminum phthalocyanine (ClAlPc), adsorbed in the Cl-down configuration on the Ag(111) substrate at low temperature − 195 °C under UV irradiation with a range of different photon fluxes. Judging from the evolution of photoemission spectral line shapes of molecular energy states, we discovered that the Cl atoms are so robustly anchored at Ag(111) that the impinging photons cannot flip the ClAlPc molecules, but instead they crouch them down due to radiation pressure; we observe that the phthalocyanine (Pc) lobes bend down to interact with Ag atoms on the substrate and induce charge transfer from them. As photon flux is increased, radiation pressure on the Pc plane initiates tunneling of the Cl atom through the molecular plane to turn the adsorption configuration of ClAlPc from Cl-down to an upheld Cl-up configuration, elucidating an optomechanical way of manipulating the dipole direction of polar molecules. Finally, work function measurements provide a distinct signature of the resulting upheld Cl-up configuration as it leads to a large increase in vacuum level (VL), ~ 0.4 eV higher than that of a typical flat-on Cl-up configuration driven by thermal annealing.
CitationScientific Reports, volume 11, issue 1, page 12645
PublisherNature Publishing Group UK
DescriptionFrom Springer Nature via Jisc Publications Router
History: received 2021-04-08, accepted 2021-06-03, registration 2021-06-04, pub-electronic 2021-06-16, online 2021-06-16, collection 2021-12
Publication status: Published
Funder: Ministry of Science and Technology of Taiwan; Grant(s): MOST 108-2112-M-007 -021 -MY3, MOST 108-2112-M-007 -021 -MY3, MOST 108-2112-M-007 -021 -MY3, MOST 108-2112-M-007 -021 -MY3, MOST 106-2112-M-007-012-MY3, MOST 108-2112-M-007 -021 -MY3, MOST 108-2112-M-007 -021 -MY3
Funder: JSPS-KAKENHI; Grant(s): JP15H05498 and JP16K14102
Funder: Royal Society; Grant(s): IEC\R3\183088