Quasi-elastic scattering of neutrons by dilute polymer solutions: I. Free-draining limit
نویسندگان
چکیده
منابع مشابه
Quasi-elastic Scattering of Neutrons
In solids random motions of atoms may take place in connection with disorder; for instance diffusion of interstitials in solid solutions or orientation fluctuations in molecular solids. Experimentally these motions are observed mostly by resonance and relaxation techni ques, by optical spectroscopy and, recently, by neutron spectroscopy. In comparison to the other me thods neutron spectroscop...
متن کاملOn the nature of the slow modes appearing in quasi-elastic light scattering by semi-dilute polymer solutions
2014 We describe three series of experiments of quasi-elastic light scattering by semi-dilute solutions of polymers. By varying parameters such as the concentration, molecular mass, polymer structure, and the time interval between the solution preparation and the time of measurement, we are able to rule out a number of hypothesis about slow modes and to propose a qualitative interpretation of t...
متن کاملLight scattering by cooperative diffusion in semi-dilute polymer solutions
2014 We report measurements of relaxation times of the autocorrelation function for the Rayleigh line of light scattered by semi-dilute polymer solutions. LE JOURNAL DE PHYSIQUE LETTRES TOME 37, MARS 1976 Classification Physics Abstracts 7.146-7.221-7.610-5.660 Recent observations of polymer diffusive motions by light scattering have dealt with two extreme situations : the very dilute solution ...
متن کاملElastic scattering of quasi-free electrons in strongly asymmetric collisions
A systematic study of the doubly differential cross sections for the electron emission occurring in fast strongly asymmetric collisions is presented. Protons and atomic hydrogen (0.5 MeV) were collided with the heavy targets krypton and xenon under single collision conditions. The ejected electrons were observed at laboratory angles in the range 0'<8,5180"and with energies E,from 25 to 1400eV. ...
متن کاملDynamic Looping of a Free-Draining Polymer
We revisit the celebrated Wilemski-Fixman (WF) treatment for the looping time of a free-draining polymer. The WF theory introduces a sink term into the Fokker-Planck equation for the 3(N + 1)-dimensional Ornstein-Uhlenbeck process of the polymer dynamics, which accounts for the appropriate boundary condition due to the formation of a loop. The assumption for WF theory is considerably relaxed. A...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Physique Fizika
سال: 1967
ISSN: 0554-128X
DOI: 10.1103/physicsphysiquefizika.3.37