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Photophysics and molecular spectroscopy seminar

Seminarium Fotofizyki i Spektroskopii Molekularnej Hybrydowo

Spectroscopy of Single Organic Dye Molecules. Electric field effect.

16-01-2023 11:00 - 12:00
Venue
Instytut Fizyki PAN, Warszawa
Email
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Speaker
prof. dr hab. Bolesław Kozankiewicz
Affiliation
Instytut Fizyki PAN

Zero-phonon absorption and fluorescence lines from single molecules can be tuned by applying an external electric field a phenomenon known as the Stark effect. The majority of single-molecule systems possess the center of symmetry and in this case we observe a quadratic frequency shift of the zero-phonon lines. A well-known example are dibenzoterrylene (DBT) molecules in an anthracene crystal. A linear Stark effect, visualized as the linear frequency shift of the lines following the electric field, is associated to a lack of centrosymmetry of the guest molecule in the host matrix, which creates the change of its electric dipole moment. DBT in 2,3-dibromonaphthalene crystal is the first successful demonstration of a strategy to use an asymmetric and polar host matrix to induce the large static dipole moments in otherwise centrosymmetric guest molecule. The Stark-shifts of the molecular electronic levels can be also induced optically by focusing an intense laser beam on the sample. A photoionization cascade is proposed in order to explain the creation of the local and stable electric field in a crystalline matrix.

 
 

List of Dates (Page event details)

  • 16-01-2023 11:00 - 12:00
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