Single molecules as nanoprobes. A study of the Shpol’skii effect

Abstract

Low temperature single molecule spectroscopy using vibronic excitation and dispersed fluorescence detection The Shpol'skii system perylene in n-hexane: A computational study of inclusion sites Inhomogeneous and single molecule line broadening of terrylene in a series of crystalline n -alkanes J. Chem. Phys. 106, 8324 (1997); 10.1063/1.473895 Shpol'skii effect and vibronic spectra of the phthalocyaninesWe present a comparative study, down to the single-molecule level, of the linewidth and multiplet structure of the optical transitions of 2.3,8.9-dibenzanthanthrene ͑DBATT͒ in shock-frozen solutions of n-decane, n-undecane, and n-tetradecane. The n-alkane matrices show weak structural ordering and distinct incorporations of the DBATT molecules have been recognized. The order does not increase, nor does the ensemble optical linewidth decrease going from bulk to sub-volumes of less than 1 m 3 . The relation between lateral position, orientation of the transition moment, and transition frequency has been investigated using single-molecule fluorescence-excitation and polarization spectroscopy. The distribution of the orientation is found not to depend on frequency and vice versa. Structural ordering on a microscopic scale is found not to be decisive as regards the linewidth and multiplet structure.

Spectroscopy and microscopy of single molecules in nanoscopic channels: spectral behavior vs. confinement depth

“…25 In this fashion, the spectral behavior of single molecules can be correlated with their orientation and location within a specific environment. 26,27 In our setup, we reached a localization precision of about 20 nm without taking any measures against mechanical vibration or drift. A cross-polarized white-light image of a 730 nm thick naphthalene crystal is shown in Fig.…”

Stretched Polyethylene Films Probed by Single Molecules

“…[2,3] We have used polarization-dependent single-molecule spectroscopy to study doped films of low-density polyethylene (LDPE). Single fluorescent probe molecules of 2.3,8.9-dibenzanthanthrene (DBATT) were used as local probes [4,5] to report on their immediate environment. The films were stretched up to a draw ratio (stretch-edÄoriginal length) of l = 6 and studied at cryogenic temperatures.…”

A single-molecule study of polycrystalline microstructure by fluorescence polarization spectroscopy

“…Previous study [19,20] showed that the resonance frequency of a guest molecule is determined by the interaction between the guest molecule and its surrounding. Bloess, etc.…”