Text this: Structures and vibrational spectra of the sulfur-rich oxides SnO (n = 4-9): The importance of π*-π* interactions

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