Patent ID: 11927554
Assignee: CANON ANELVA CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 12:
13. An inspection method of inspecting an inspection target surface arranged on an inspection plane, comprising:
an X-ray detection step of emitting X-rays to the inspection plane and detecting, by an X-ray detector, X-rays emitted from a foreign substance existing on the inspection target surface and totally reflected by the inspection target surface; and
a processing step of processing an output of the X-ray detector, wherein
an angle formed by the inspection plane and a virtual line connecting an X-ray receiving portion of the X-ray detector and a position at which the X-rays from the X-ray generation portion enter the inspection plane is not larger than a total reflection critical angle θc, wherein, δ
     =
     
      
       (
       
        
         
          r
          e
         
         ⁢
         
          λ
          2
         
        
        
         2
         ⁢
         π
        
       
       )
      
      ⁢
      
       N
       0
      
      ⁢
      ρ
      ⁢
      
       
        ∑
        i
       
       
        
         x
         i
        
        ⁢
        
         (
         
          
           z
           i
          
          +
          
           f
           i
           ′
          
         
         )
        
        /
        
         
          ∑
          i
         
         
          
           x
           i
          
          ⁢
          
           M
           i
          
         
        
       
      
     
    
   
  
  
   
    
     
      θ
      c
     
     ≈
     
      
       2
       ⁢
       δ
      
     
    
   
  
 

θc: total reflection critical angle
re: classical electron radius (2.818×10−15 m)
N0: Avogadro number
λ: X-ray wavelength
ρ: density (g/cm3)
Zi, Mi, xi: atomic number, atomic weight, and atomic ratio (molar ratio) of ith atom
f′i: atomic scattering factor (anomalous dispersion term) of ith atom.