The Fluorescence and Scintillation Decay Times of Crystalline Anthracene

  title={The Fluorescence and Scintillation Decay Times of Crystalline Anthracene},
  author={J. Birks},
The experimental data are analysed with the following conclusions. The molecular decay time τ0 of a thin anthracene crystal lamina at room temperature is 10 nsec. The thick crystal values are increased by self-absorption to 31.6 nsec (volume excitation, e.g. by γ-rays), 24.1 nsec (surface excitation, e.g. by ultra-violet or α-rays, and emission observed by transmission) and 19.4 nsec (surface excitation, and observation by reflection). Surface oxidation or reduction in crystal thickness yields… Expand
Variations in the Efficiency of Fluorescence Excitation in Anthracene
The efficiency with which fluorescence is excited in single crystals of anthracene has been reported to vary considerably with both the excitation wavelength and the condition of the crystal. TheseExpand
The accurate pulse shapes of luminescence of anthracene single crystal in the time region of about 50 nsec from the rise-portion of pulse excited by UV light pulse, α-, β-particle and γ-ray wereExpand
Diffussion of Singlet Excitons in Anthracene Crystals
The temperature dependence of the decay time of singlet excitons in anthracene crystals was measured under no suffering of reabsorption effect. It was clarified that the excitons were populated onExpand
The Photoluminescence Decay of Organic Crystals
The photoluminescence decay of single (1 cm3) organic crystals has been observed over the time interval 0-250 nsec, using a pulsed light source, fast photomultiplier and pulse-sampling oscilloscope.Expand
Laser Generation of Excitons and Fluorescence in Anthracene Crystals
Experimental and theoretical studies are reported of the short‐lived and delayed fluorescence of anthracene single crystals, excited by single‐ and double‐photon absorption. A giant‐pulse ruby laserExpand
Trapping of Triplet Excitons and the Temperature Dependence of Delayed Fluorescence in Anthracene Crystals
Singh and Lipsett have observed that the intensity of fluorescence due to triplet—triplet annihilation in anthracene crystals exhibits an anomalous temperature dependence involving several distinctExpand
Emission of phosphorescence from biacetyl surface by collision of N2(A 3Σ+u)
A supersonic beam of nitrogen molecules was excited to the A 3Σ+u state by electron impact and was allowed to collide with a biacetyl surface cooled at 77 K. The spectrum of the emission from theExpand
The Influence of Reabsorption and Defects on Anthracene Crystal Fluorescence
Abstract Expressions are derived for the influence of host crystal and defect reabsorption, exciton trapping and thermal detrapping, and defect and impurity fluorescence on the fluorescenceExpand
Electron momentum distribution and singlet-singlet annihilation in the organic anthracene molecular crystals using positron 2D-ACAR and fluorescence spectroscopy.
The mapped EMD in a single crystal of anthracene by two-dimensional angular correlation of positron annihilation radiation (2D-ACAR) has exhibited evidence for the absence of free volume defects. Expand
‘Excimer’ fluorescence I. Solution spectra of 1:2-benzanthracene derivatives
  • J. Birks, L. Christophorou
  • Chemistry
  • Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
  • 1963
Observations have been made of the concentration dependence of the fluorescence spectra of solutions of 1:2-benzanthracene and fifteen of its hydrocarbon derivatives. All of the compounds, except theExpand


Fluorescence Spectra of Organic Crystals
Relative quantum intensity measurements have been made of the fluorescence spectra, excited by 254 mμ radiation, of crystalline anthracene, trans-stilbene, para-terphenyl and diphenylacetylene atExpand
Absolute Quantum Efficiency of Photofluorescence of Anthracene Crystals
The fluorescence characteristics of organic crystals differ appreciably from those of the emitting molecules due to self-absorption of the molecular fluorescence. These differences are investigatedExpand
Decay Times of Fluorescent Substances Excited by High-Energy Radiation
Decay times of fluorescent light emitted by organic solutions and by onganic and inorganic solids when excited by high-energy radiation are determined under various experimental conditions. TheExpand
Photofluorescence Decay Times of Organic Phosphors
An accurate and convenient method for measuring photofluorescence decay times in the nanosecond region is described. Results are given for a number of organic compounds and reasons for differencesExpand
Study of Organic Scintillators
The scintillation counting behavior of a group of fifty‐five pure crystalline organic compounds has been extensively studied. The data obtained have been analyzed with the goal of developing a betterExpand
Resonance Transfer of Electronic Energy in Organic Crystals
The resonance transfer of energy in crystals of organic compounds when excited by visible or ultra-violet light has been examined by measuring the fluorescence of the systems naphthalene-anthracene,Expand
The Scintillation Process in Organic Systems
  • J. Birks
  • Materials Science
  • IRE Transactions on Nuclear Science
  • 1960
The scintillation process in organi: crystals and solutions is described, and a mechanism is proposed to account for the origin of the fast and slow scintillation components. The intermolecularExpand
Notizen: Über die Abklingzeit von festen Lösungen aromatischer Kohlenwasserstoffe
Bei organischen fluoreszierenden Stoffen in kristallinem Zustand beobachtet man häufig, daß die Fluoreszenzfarbe durch geringste Spuren geeigneter Fremdmoleküle stark verändert wird. Ein typischesExpand
  • Nucleonics
  • 1952
Proc. Phys. Soc. B
  • Proc. Phys. Soc. B
  • 1949