Fragmentation and mass spectra of Ethers

• Molecular ion peak is small.
• The presence of oxygen atom can be deduced from strong peaks at m/z31,45,59,73 ect. These peaks represents the RO⁺ and ROCH₂⁺fragments.
• Fragmentation of the resulting molecular ion occurs in two principal ways:

1. A C-O bond is cleaved heterolytically, with the electrons going to the more electronegative oxygen atom. 
   
2. A C-C bond is cleaved homolytically at the position because it leads to a relatively stable cation in which the positive charge is shared by two atoms (carbon and oxygen).
   

Now try to this interpret spectrum