title: NQR study of chalcogenide glasses Ge-As-Se.
abstract: A three-component Ge-As-Se system is studied by the nuclear quadrupole resonance (NQR) method on (75)As nuclei and by the nutation NQR spectroscopy. The NQR (75)As spectra of the glasses Ge(0.021) As(0.375) Se(0.604), Ge(0.043) As(0.348) Se(0.609) and Ge(0.068) As(0.318) Se(0.614) reveal broad lines with two peaks assigned to the main structural unit of As(2)Se(3). With increasing average coordination number ( ̅r), the spectrum signals are shifted towards higher frequencies. At ̅r > 2.54, the spectrum becomes complex, which is a consequence of formation of more complex molecular structures in the glasses of high content of germanium. At fixed frequencies the asymmetry parameter η of the samples studied is determined.
authors: Department of Physics, Adam Mickiewicz University, Poznan, Poland. glotova@amu.edu.pl
authors: Olga
authors: O
authors: Glotova
authors: Irina
authors: I
authors: Korneva
authors: Nikolay
authors: N
authors: Sinyavsky
authors: Michal
authors: M
authors: Ostafin
authors: Boleslaw
authors: B
authors: Nogaj