Absorption cross-sections of hole polarons in glassy and β-phase polyfluorene

Absorption induced by electrochemically injected holes is studied in poly-9,9-dioctylfluorene (PFO) films. Injected charges form positive polarons which are delocalised over four fluorene units in the glassy phase and about seven fluorene units in its β-phase. Polaron absorption cross-sections at the 640 nm peak are similar to the published values of chemically reduced oligofluorenes in solution. The absorption cross-section of polaron in the β-phase at 470 nm is about eight times smaller than the stimulated emission cross-section derived from published data. This indicates that β-phase-rich PFO is an attractive candidate for a light-emitting layer in double-heterostructure organic laser diodes.

The Hansen-Roach cross sections : a graphical representation /

"October 1988."

Total cross sections of nuclei for 280 Mev neutrons.

The measurement of 28O-Mev neutron cross sections of various nuclei is described. The neutron beam used results from 340-Mev protons in the 184-in. cyclotron striking a 2-in. Be target. The neutron detector consists of a double coincidence anthracene scintillation counter telescope which counts recoil protons scattered at 15 deg from a paraffin cylinder placed in the collimated neutron beam. A 2-in. Cu absorber placed between the counters assures that only protons of energy greater than 250 Mev are counted. The cross sections for all nuclei measured from Li to Pb are smaller than the corresponding cross sections measured at 90 Mev by factors between 0.5 and 0.6.

Capture cross sections for fast neutrons /

Work performed at the Argonne National Laboratory.

Capture cross sections of I¹²⁷, In¹¹⁵, Ag¹⁰⁹, Au¹⁹⁷, Ag¹⁰⁷ for neutrons of various energies /

"LADC 101"

Factors affecting traffic operations on seven-lane cross sections. Final report.

Texas Department of Transportation, Austin

Neutron cross sections: angular distributions

"Expansion of the limited amount of angular

Summary of flow loss between selected cross sections on the Rio Grande in and near Albuquerque, New Mexico /

Includes bibliographical references (p. 30).

Literature survey of nucleon 2 nucleon reaction cross sections at energies above 100 MeV /

"Contract No. AT(30-1)-2897."

Nuclear data : a collection of experimental values of half-lives, radiation energies, relative isotopic abundances, nuclear moments and cross sections /

Bibliography: p. 275-309.

Nuclear cross sections and technology : proceedings of a conference, Washington, D.C., March 3-7, 1975 /

Conference sponsored by the Reactor and Shielding Division of the American Nuclear Society and others.

Nuclear cross sections for technology : proceedings of the International Conference on Nuclear Cross Sections for Technology, held at the University of Tennessee, Knoxville, TN, October 22-26, 1979 /

Item 247.

Neutron cross sections

Mode of access: Internet.

Hafnium cross sections and their temperature dependence,

"Contract W-7 405-Eng. 36 with the U. S. Atomic Energy Commission."