title: Characterization of p-bis(O-methylstyryl)benzene as a lifetime and anisotropy decay standard for two-photon induced fluorescence.
abstract: We describe the fluorescence spectral properties of p-bis(O-methylstyryl)benzene (bis-MSB) as a standard for time-resolved measurements of two-photon induced fluorescence. Bis-MSB displays the same single exponential intensity decay in several solvents for one- and two-photon excitation. The anisotropy decay displays the same single correlation time of one- and two-photon excitation. The amplitudes of the anisotropy decay are distinct for one- and two-photon excitation. At some excitation wavelengths the anisotropy amplitude appears to be solely the result of one- and two-photon photoselection, but at shorter wavelengths the anisotropy amplitudes are not related by single constant factor. The absorption range of bis-MSB makes it a suitable standard for one- and two-photon excitation of intrinsic protein fluorescence and extrinsic fluorophores.
authors.affiliation: University of Maryland, School of Medicine, Department of Biological Chemistry, Baltimore 21201.
authors.forename: J R
authors.initials: JR
authors.lastname: Lakowicz
authors.forename: I
authors.initials: I
authors.lastname: Gryczynski
mesh_terms: D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry* / Q000528:radiation effects; D011827:Radiation; D013050:Spectrometry, Fluorescence; D013343:Styrenes / Q000737:chemistry* / Q000528:radiation effects; D013816:Thermodynamics
chemical_list: D005456:Fluorescent Dyes; D013343:Styrenes; C083050:4-bis(2-methylstyryl)benzene