This PDF file includes:

• S1. Constants and properties of H₂O and D₂O
  
• S2. Femtosecond elastic second harmonic scattering
  
• S3. Phenomenological discussion of the response of spherical domains
  
• S4. Spherical domain size dependence of the fs-ESHS signal
  
• S5. Molecular dynamics simulations
  
• S6. fs-ESHS from pure H₂O and D₂O
  
• S7. Mean-field models
  
• S8. Surface tension measurements and interpretation
  
• Table S1. Constants and properties of H₂O and D₂O.
  
• Table S2. Domain radius, corresponding number of hydration shells, and anisotropy in case the domain size is only determined by the average ion separation.
  
• Fig. S1. Elastic and inelastic second harmonic scattering.
  
• Fig. S2. Sketch of the relevant parameters needed in the phenomenological discussion.
  
• Fig. S3. ΔI as a function of domain size and relative structural anisotropy.
  
• Fig. S4. fs-ESHS patterns for pure H₂O and pure D₂O.
  
• Fig. S5. Mean-field models and temperature dependence.
  
• References (61–87)

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