title: Photon statistics in blinking fluorescence of single PPV-PPyV molecule.
abstract: A theoretical six-level model for blinking fluorescence of single PPV-PPyV copolymer molecule excited by CW-laser light is proposed. The model has been chosen in accordance with the following facts found in the Paul Barbara group experiment: (i) alternation of two types of fluorescence with moderate and strong levels of emission, (ii) existence of "dark" states with no fluorescence, (iii) linear dependence of inverse on-interval duration on laser intensity, and (iv) existence of laser intensity independent off-intervals. Relations between the distribution function w''(N, T) for photons emitted by a single molecule, the distribution function w'(N, T) for photons arriving at photomultiplier tube (PMT) and photo-electric pulse distribution w(N, T) created in a PMT are discussed. The theory is able to describe pulse distribution function w(N, T) measured experimentally at signal acquisition time T = 0.1 s. Values of all rate constants of the model have been found from comparison of the theory with the experiment. Distributions w(on, off)(t) of on- and off-times and distribution w(N, T) of pulses have been calculated for infrequent and frequent inter-conformational jumps in single copolymer molecule.
authors.affiliation: Moscow Pedagogical State University, 119435 Moscow, Russia.
authors.forename: V V
authors.initials: VV
authors.lastname: Fedyanin
authors.forename: I S
authors.initials: IS
authors.lastname: Osad'ko
mesh_terms: D005453:Fluorescence; D015394:Molecular Structure; D009010:Monte Carlo Method; D017785:Photons; D011145:Polyvinyls / Q000737:chemistry*
chemical_list: D011145:Polyvinyls