PL EN


Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników
Czasopismo
2005 | 3 | 1 | 61-68
Tytuł artykułu

Phase transitions in the adsorbed molecular chains

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Rotational excitations of molecular adsorbed layers are studied theoretically. Nonlinear dynamical equations are obtained with accounting of quadrupolar interactions between molecules and freezing of translational degrees of freedom. The equilibrium positions of the molecules are found to be experimentally observed structures with alternating rotational ordering of planar rotors along the direction to the nearest neighbor (for linear or square structures) under low temperature. Dynamical analysis gives an integral of motion (energy) of the chain that in the long-wave limit leads consequently to the existence of four phases. The first one corresponds to oscillations near equilibrium ordered states. The second phase corresponds to low-energy rotational excitations along ‘valleys’ (easy directions in the effective potential) that do not destroy strong correlations between molecules while structural data can show rotational disorder (melting). The third phase corresponds to an energy that is enough to travel between ‘valleys’; only some ‘islands’ in the angle space are forbidden. Complete destruction of correlation when the energy is over the peaks of the effective potential corresponds to the fourth phase. Therefore rotational melting is a complex phenomenon that has several stages.
Wydawca

Czasopismo
Rocznik
Tom
3
Numer
1
Strony
61-68
Opis fizyczny
Daty
wydano
2005-03-01
online
2005-03-01
Twórcy
autor
  • Physics-technology dept., National Technic University “Kharkov Polytechnic Institute”, Frunze Str. 21, 61002, Kharkov, Ukraine, lykah@ilt.kharkov.ua
autor
  • Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Lenin ave., 47, Kharkov, 61103, Ukraine, syrkin@ilt.kharkov.ua
Bibliografia
  • [1] D. Marx, H. Wiechert: “Ordering and phase transitions in adsorbed monolayers of diatomic molecules”,Adv. Chem. Phys., Vol. XCV, (1996), pp. 213–394.
  • [2] M. Born, Kun Huang:Dynamical theory of crystal lattices, Claridon Press, Oxford, 1954.
  • [3] M. Toda:Teory of nonlinear lattices, Springer Series in Solid State Sciences N 20, Springer, Berlin, 1981. [Crossref]
  • [4] Yu.A. Freiman, V.G. Manzhelii:Physics of Cryocrystals, Ed. A.A. Maradudin, Woodbury, NY, USA, 1996.
  • [5] V.A. Lykah, E.S. Syrkin: “Rotational oscillations of molecular chain with quadrupolar interaction”,Physica status solidi (c), [to be printed].
  • [6] A.J. Lichtenberg, M.A. Lieberman:Regular and stochastic motion, Springer, Berlin, Heidelberg/NY, 1983.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_BF02476506
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.