أرسل هذا في رسالة قصيرة: Reduction of amplitude and wavelength of Friedel oscillation on Na(111) surface

  _  _      ___     _    _     _____    _    _   
 | \| ||   / _ \\  | || | ||  |  ___|| | \  / || 
 |  ' ||  / //\ \\ | || | ||  | ||__   |  \/  || 
 | .  || |  ___  ||| \\_/ ||  | ||__   | .  . || 
 |_|\_|| |_||  |_|| \____//   |_____|| |_|\/|_|| 
 `-` -`  `-`   `-`   `---`    `-----`  `-`  `-`