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Regulating the femtosecond excited-state lifetime of a single molecule.

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Title: Regulating the femtosecond excited-state lifetime of a single molecule.
Authors: Rusimova, K. R., Purkiss, R. M., Howes, R., Lee, F., Crampin, S., Sloan, P. A.
Source: Science (pre-March 2025). 9/7/2018, Vol. 361 Issue 6406, p1012-1016. 5p. 2 Diagrams, 3 Graphs.
Subjects: Molecules, Molecular physics, Surface chemistry, Scanning tunneling microscopy, Scanning probe microscopy
Abstract: The key to controlling reactions of molecules induced with the current of a scanning tunneling microscope (STM) tip is the ultrashort intermediate excited ionic state. The initial condition of the excited state is set by the energy and position of the injected current; thereafter, its dynamics determines the reaction outcome. We show that a STM can directly and controllably influence the excited-state dynamics. For the STM-induced desorption of toluene molecules from the Si(111)-7x7 surface, as the tip approaches the molecule, the probability of manipulation drops by two orders of magnitude. A two-channel quenching of the excited state is proposed, consisting of an invariant surface channel and a tip height–dependent channel. We conclude that picometer tip proximity regulates the lifetime of the excited state from 10 femtoseconds to less than 0.1 femtoseconds. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 9/7/2018, Vol. 361 Issue 6406, p1012-1016. 5p. 2 Diagrams, 3 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Molecules%22">Molecules</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+physics%22">Molecular physics</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+chemistry%22">Surface chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+tunneling+microscopy%22">Scanning tunneling microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+probe+microscopy%22">Scanning probe microscopy</searchLink>
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  Data: The key to controlling reactions of molecules induced with the current of a scanning tunneling microscope (STM) tip is the ultrashort intermediate excited ionic state. The initial condition of the excited state is set by the energy and position of the injected current; thereafter, its dynamics determines the reaction outcome. We show that a STM can directly and controllably influence the excited-state dynamics. For the STM-induced desorption of toluene molecules from the Si(111)-7x7 surface, as the tip approaches the molecule, the probability of manipulation drops by two orders of magnitude. A two-channel quenching of the excited state is proposed, consisting of an invariant surface channel and a tip height–dependent channel. We conclude that picometer tip proximity regulates the lifetime of the excited state from 10 femtoseconds to less than 0.1 femtoseconds. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.aat9688
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        Text: English
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      – SubjectFull: Surface chemistry
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      – SubjectFull: Scanning tunneling microscopy
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      – SubjectFull: Scanning probe microscopy
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              Text: 9/7/2018
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